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Achieving serrated grain boundaries within gradient microstructures of nickel-based superalloys for dual-property turbine disks in aeroengines 认领 引用 被引量：1
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作者 Bingchao XIE Yongquan NING +4 位作者 Youwei LUO Zhaotian WANG Bowen SHI Mei ZHAN Mingwang FU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第2期641-660,共20页
Gradient microstructures strengthened by serrated Grain Boundaries(GBs)were achieved through a combination of Gradient Strain Deformation(GSD)and Serration Heat Treatment(SHT),with particular focus on microstructural ... Gradient microstructures strengthened by serrated Grain Boundaries(GBs)were achieved through a combination of Gradient Strain Deformation(GSD)and Serration Heat Treatment(SHT),with particular focus on microstructural evolution,underlying mechanisms,and the critical influencing factors.Dynamic recrystallization governed the microstructural evolution in the fine-grained and transition regions during GSD,where multiple nucleation mechanisms were active.Plastic deformation facilitated the dissolution ofγ'phase in fine-grained regions,ultimately resulting in its morphological transformation.During the subsequent SHT,serrated GBs formed within the gradient microstructures produced by prior GSD without disrupting the grain size gradient,thereby enhancing creep resistance.Two distinct mechanisms associated withγ'gbparticles governed the formation of the serrations at GBs.Owing to the stronger dragging effect of grain boundary junctions in fine-grained regions,the amplitude and wavelength of serrations in these regions were smaller than those in coarse-grained regions.Moreover,the formation of serrations exhibited a strong dependence on the inherent properties of the GBs.The random high-angle grain boundaries(HAGBs)with misorientation angles in the range of 30-59°tended to become serrated more easily during SHT due to their high mobility and the accelerated precipitation ofγ'gbparticles at them.Low-ΣHAGBs and low-angle GBs were not prone to form serrations.In particular,serration formation was completely inhibited atΣ3 twin boundaries due to their extremely low mobility and the absence ofγ'gbparticles. 展开更多
关键词 Gradient microstructures Grain boundary migration Grain boundary properties Serrated grain boundaries Serration formation mechanisms Superalloys
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Characterization of the formation of slag rims of mold powder during hypo-peritectic steel continuous casting based on full-sectional microstructures 认领 引用
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作者 Zhiqiang Peng Zibing Hou +2 位作者 Shuxian Xu Ping Tang Guanghua Wen 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第2期567-578,共12页
A full-sectional microstructure characterization method was developed to investigate the formation of coarse slag rims during the continuous casting of hypo-peritectic steel.The cross-sectional microstructural analysi... A full-sectional microstructure characterization method was developed to investigate the formation of coarse slag rims during the continuous casting of hypo-peritectic steel.The cross-sectional microstructural analysis of typical slag rims for two highly crystalline powders revealed that their formation was primarily driven by the solidification of the liquid slag.Distinct differences were observed in the microstructures of slag rims from the two powders.Powder A(characterized by a higher breaking temperature and viscosity)displayed alternating lamellar microstructures of coarse and fine phases,with the coarse phases composed of akermanite-gehlenite transition phases.In contrast,powder B(with a lower breaking temperature and viscosity)predominantly comprised regular akermanite-gehlenite crystals interspersed with a certain amount of glassy phases.Numerical simulations of a three-phase fluid flow coupled with heat transfer indicate that slag rim formation correlates with mold oscillation.Solidification of the liquid slag at the slag rim front predominantly occurs during the negative stroke of the mold oscillation.The average heating rate during the ascending stage of the mold reaches approximately 100 K·s−1,whereas the average cooling rate during the descending stage attains 400 K·s−1.This temperature variation leads to the formation of lamellar microstructures,whereas the ascending stage promotes the formation of coarse structures and thicker slag rims.Based on the powder properties,two distinct formation pathways exist for highly crystalline mold powders.For the powders with a higher breaking temperature,higher viscosity,and narrower solidification range(powder A),coarse microstructures and thicker slag rims were preferentially formed.For powders with lower breaking temperature and viscosity and wider solidification ranges(powder B),the liquid slag resisted rapid solidification,and the extended mushy zone allowed the partial liquid slag to persist at the slag rim front,promoting the formation of a thin slag rim.This study enhances the understanding of slag rim formation in highly crystalline mold powders and provides critical insights into the control of longitudinal surface cracks in hypo-peritectic steel. 展开更多
关键词 hypo-peritectic steel longitudinal surface crack continuous casting slag rim full-sectional microstructures mold powder
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Microstructures,mechanical properties and corrosion resistances of FCC CoCrFeNiTi high-entropy alloys prepared by pre-alloyed powder mixing and vacuum laser-directed energy deposition 认领 引用
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作者 Jian Zhu Shuhao Zhao +3 位作者 Zhen Li Yi Xu Shuai Wu Xidong Hui 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第6期2029-2040,共12页
In this study,vacuum laser-engineered directed energy deposition(V-LDED)was employed to fabricate CoCrFeNiTix(x=0.1,0.2,0.3)high-entropy alloys(HEAs)by strategically mixing equiatomic pre-alloyed CoCrFeNi and CoCrF... In this study,vacuum laser-engineered directed energy deposition(V-LDED)was employed to fabricate CoCrFeNiTix(x=0.1,0.2,0.3)high-entropy alloys(HEAs)by strategically mixing equiatomic pre-alloyed CoCrFeNi and CoCrFeNiTi powders.With increas-ing Ti content,the lattice distortion of the HEAs intensified,grains were refined,and precipitate content increased;however,the face-centered cubic(FCC)structure remained the predominant structure.The strength and plasticity of the HEAs initially increased and then decreased with the addition of Ti.The CoCrFeNiTi0.3(Ti0.3)alloy exhibited the best mechanical properties,with a tensile yield strength(TYS)of 604 MPa,an ultimate tensile strength(UTS)of 882 MPa,and a plastic elongation of 13.5%.Compared to the Ti-free alloy,the TYS and UTS were increased by 124%and 83%,respectively.The CoCrFeNiTi0.2(Ti0.2)alloy showed the best corrosion resistance with the corrosion potential(Ecorr),corrosion current density(Icorr),passivated film resistor(Rc),and charge transfer resistance(Rct)values of-0.208 V,4.889×10-7A/cm2,7.03×103Ω/cm2,and 8.50×105Ω/cm2,respectively.The addition of Ti increased the Cr and Ti contents in the passive film,which are easily passivated elements.The multiple effects of Ti on the corrosion resistance were mainly attributed to the formation and composition of the passive film and density of the precipitates. 展开更多
关键词 vacuum laser-engineered directed energy deposition CoCrFeNiTi alloys microstructures mechanical properties corrosion resistance
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Experimental and simulation study on high-power laser irradiation of 3D-printed microstructures 认领 引用
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作者 M.Cipriani F.Consoli +7 位作者 M.Scisció A.Solovjovas I.A.Petsi M.Malinauskas P.Andreoli G.Cristofari E.Di Ferdinando G.Di Giorgio 《Matter and Radiation at Extremes》 SCIE EI CAS CSCD 2026年第2期51-64,共14页
Inertial confinement fusion(ICF)requires a constant search for the most effective materials to improve the efficiency of compression of the capsule and of laser-to-target energy transfer.Foams could provide a solution... Inertial confinement fusion(ICF)requires a constant search for the most effective materials to improve the efficiency of compression of the capsule and of laser-to-target energy transfer.Foams could provide a solution,but they require further experimental and theoretical investigation.The new 3D-printing technologies,such as two-photon polymerization,are opening a new era in the production of foams,allowing fine control of material morphology.Very few detailed studies of the interaction of foams with high-power lasers in regimes relevant for ICF have been described in the literature to date,and more investigation is needed.In this work,we present the results of an experimental campaign performed at the ABC laser facility at ENEA Centro Ricerche Frascati in which 3D-printed microstructured materials were irradiated at high power.3D simulations of the laser-target interaction performed with the FLASH code reveal that the laser is scattered by plasma density gradients and channeled into the structure when the center of the focal spot is on the through hole.The time required for the laser to completely ablate the structure given by the simulations is in good agreement with the experimental measurement.Measurements of the reflected and transmitted laser light indicate that scattering occurred during the irradiation,in accordance with the simulations.Two-plasmon decay has also been found to be active during irradiation. 展开更多
关键词 inertial confinement fusion scattering plasma density gradients D printed microstructures two photon polymerization compression capsule inertial confinement fusion icf requires high power laser irradiation
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3D forming space and abnormal lamellar microstructures in a Mg-10Gd-Zr alloy fabricated by laser powder bed fusion 认领 引用 被引量：1
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作者 Ziyi Liu Qingchen Deng +4 位作者 Ziyan Li Yiwen Ding Jing Luo Hong Liu Liming Peng 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第2期460-479,共20页
Mg-10Gd-Zr(G10K,wt.%)is a commonly used high-performance magnesium-rare earth alloy that has demonstrated good suitability for additive manufacturing processes.However,the formability and microstructures need to be fu... Mg-10Gd-Zr(G10K,wt.%)is a commonly used high-performance magnesium-rare earth alloy that has demonstrated good suitability for additive manufacturing processes.However,the formability and microstructures need to be further explored for its engineering application.This study presents a systematic and in-depth investigation of the defects,microstructural characteristics,and mechanical properties of G10K alloy fabricated by laser powder bed fusion(LPBF)as a function of processing parameters.A 3D forming space for LPBF-G10K alloy is constructed by adopting laser beam diameter as the third variant other than laser power and scanning speed.With a laser beam diameter of 120μm,the fluctuation of the melt pool is minimized,leading to the suppression of gas porosities and balling defects,and thus the expansion of forming zone of the alloy as compared to laser beam diameters of 100 or 140μm.LPBF-G10K alloy under the optimal processing parameter consists of a heterogeneous microstructure of coarse and fine grains.The formation of abnormal lamellar structures in the coarse grains at the middle of melt pools is attributed to the planar growth along laser scanning direction.The lamellar coarse grains provide strength in the alloy due to texture-strengthening effect,while plastic deformation is primarily accommodated by equiaxed grains.These findings are instrumental for application and future modification of the LPBF-G10K alloy. 展开更多
关键词 Laser powder bed fusion Mg-Gd alloy Laser beam diameter,defect Lamellar microstructure
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Solid-state additively manufactured Mg-Al-Zn-Mn alloys:Effects of Al content on microstructures and mechanical properties 认领 引用
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作者 Hui Wang Yidi Li +3 位作者 Ruilin Lai Chenying Shi Biaobiao Yang Yunping Li 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第5期254-272,共19页
Additive friction stir deposition(AFSD),as an advanced solid-state additive manufacturing technique,offers significant potential for fabricating large-scale engineering structural components.In this study,Mg-xAl-1Zn-0... Additive friction stir deposition(AFSD),as an advanced solid-state additive manufacturing technique,offers significant potential for fabricating large-scale engineering structural components.In this study,Mg-xAl-1Zn-0.5Mn(x=3,6,and 9 wt.%)alloys were fabricated via AFSD.And the effect of Al content on the microstructural evolution,mechanical properties,and fracture behavior was systematically investigated.The results reveal that all AFSD AZ series Mg alloys exhibit refined equiaxed grains and a typical basal texture,with the(0002)axis parallel to the build direction(BD).However,increasing Al content results in a gradual decrease in both average grain size and basal texture intensity.Alloy with low content of Al(≤6 wt.%)exhibits uniform grain size and precipitate distribution,whereas alloy with high content of Al(e.g.,9 wt.%)displays a bimodal structure composed of fine grain bands decorated byβ-Mg17Al12 phase near grain boundaries and coarse grain bands.For this,a clear strength-ductility trade-off is observed:with increasing Al content,the yield strength rises from 152.8±17.9 MPa to 215.5±17.7 MPa,accompanied by a reduction in fracture elongation from 15.9±0.6%to 12.3±0.6%.These findings can offer theoretical insight and practical guidance for the AFSD AZ series(Mg-Al-Zn-Mn)alloys with synergistic strength and ductility. 展开更多
关键词 Additive friction stir deposition Mg alloy Microstructure EBSD Mechanical properties
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3D morphological characteristics of shrinkage porosities and their relationship with microstructures in Mg−12Al magnesium alloy 认领 引用
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作者 Chuang-ming LI Ang ZHANG +6 位作者 Yong-feng LI Heng-rui HU He LIU Yu-yang GAO Zhi-hua DONG Bin JIANG Fu-sheng PAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第1期96-111,共16页
The dependence of shrinkage porosities on microstructure characteristics of Mg−12Al alloy was investigated.The distribution,morphology,size,and number density of shrinkage porosities were analyzed under different cool... The dependence of shrinkage porosities on microstructure characteristics of Mg−12Al alloy was investigated.The distribution,morphology,size,and number density of shrinkage porosities were analyzed under different cooling rates.The relationship between shrinkage porosities and microstructure characteristics was discussed in terms of temperature conditions,feeding channel characteristics,and feeding capacity.Further,the feeding behavior of the residual liquid phase in the solid skeleton was quantified by introducing permeability.Results show a strong correlation between the solid microstructure skeleton and shrinkage porosity characteristics.An increase in permeability corresponds to a declining number density of shrinkage porosities.This study aims to provide a more complete understanding how to reduce shrinkage porosities by controlling microstructure characteristics. 展开更多
关键词 Mg−12Al alloy shrinkage porosity solidification microstructure characteristics morphological characteristics
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Effects of deep cryogenic treatment on microstructures,mechanical properties and dimensional stability of beryllium for inertial devices 认领 引用
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作者 REN Peng-he XIAO Lai-rong +1 位作者 ZHAO Xiao-jun CAI Zhen-yang 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第4期1487-1498,共12页
This study investigated the effects of deep cryogenic treatment(DCT)on hot isostatic pressed(HIP)beryllium for inertial devices,focusing on residual stress,microstructure,tensile properties,and dimensional stability.T... This study investigated the effects of deep cryogenic treatment(DCT)on hot isostatic pressed(HIP)beryllium for inertial devices,focusing on residual stress,microstructure,tensile properties,and dimensional stability.The findings revealed that during DCT,residual stress in beryllium increased gradually due to non-uniform volumetric contraction and mismatch stress,reaching a 59.9%increase from initial levels after 200 h of DCT.DCT led to significant grain refinement and an increase in dislocation density.In 200 h DCT-treated beryllium,geometric necessary dislocation(GND)density increased 17.9%,grain size decreased 12.3%,and therefore yield strength and tensile strength improved by 4.2% and 5.6%,respectively.The dimensional stability of HIP beryllium was significantly enhanced by DCT,and the improvement tended to increase with the duration of DCT.The cumulative size changes of beryllium after 200 h of DCT during both cold exposure and cold cycling decreased significantly by 86% and 50%,respectively,compared to those of HIP beryllium.Furthermore,the residual tensile strength and retention rate increased by 12.5% and 5.5%,respectively,after undergoing room-temperature creep at 100 MPa for 1000 h. 展开更多
关键词 inertial devices beryllium deep cryogenic treatment dimensional stability microstructure mechanical properties
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Microstructures and mechanical properties of argon tungsten arc welded TiAl joints using Ti-Nb binary filler alloy 认领 引用
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作者 Hanyu Zhao Zhiliang Zhai +2 位作者 Wei Liu Shuai Huang Tao Lv 《China Welding》 CAS 2026年第2期50-56,共7页
Argon tungsten arc welding of TiAl base alloy using Ti-30Nb(at.%)filler metals was conducted.The results indicated that sound TiAl welded joints were achieved with preheating temperature of 498℃.Microstructure and pr... Argon tungsten arc welding of TiAl base alloy using Ti-30Nb(at.%)filler metals was conducted.The results indicated that sound TiAl welded joints were achieved with preheating temperature of 498℃.Microstructure and properties of the welded TiAl joints were investigated.A transitional reaction zone,primarily consisting ofγ-TiAl andα2-Ti3Al,was observed at the interface between the weld zone and the TiAl base alloy.Due to the intense reaction between the TiAl base metal and the Ti-Nb filler metal,amounts of acicular intermetallic compounds were formed within the central region of the weld zone,consisting ofα2-Ti3Al and B2 phases.The tensile fracture of the joints exhibited brittle cleavage pattern.The average tensile strength of the welded joints at room-temperature reached 372.6 MPa,about 73.1%of the base metal(BM),with joint fracture occurred in the weld zone.Owing to the solid-solution strengthening effect of Nb,the joint tensile strength retained 326.6 MPa at 700℃,and 300 MPa at 750℃. 展开更多
关键词 TiAl alloy Ti-Nb filler alloy Gas tungsten arc welding Microstructure evolution α2-Ti3Al B2 phase
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Tip-based vibration carving of shape-customized convex microstructures:principle,modeling,and experiments 认领 引用
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作者 Jiahui Liu Pingfa Feng +3 位作者 Hansong Ji Jianfu Zhang Xiangyu Zhang Jianjian Wang 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第2期653-692,共40页
Convex structures are a crucial type of surface functional structure whose shape significantly affects their performance.Tip-based machining and vibration texturing are two groups of state-of-the-art subtractive fabri... Convex structures are a crucial type of surface functional structure whose shape significantly affects their performance.Tip-based machining and vibration texturing are two groups of state-of-the-art subtractive fabrication methods for microano structures,each offering distinct advantages:tip-based machining excels in achieving small feature sizes,whereas vibration texturing improves production efficiency.This study aims to combine these methods to create a more powerful micromachining technique,namely tip-based vibration carving(TVC),particularly suited for fabricating shape-customized convex microstructures.In TVC,the vibration trajectory and nominal carving motion of the tip tool are parallel to the workpiece surface.In each vibration cycle,the tip tool removes some material while the remaining material becomes one convex microstructure.Therefore,the shape of convex microstructures can be customized by the design of vibration trajectories.By adopting high-frequency vibration,the production rate of convex microstructures can be highly efficient.Based on the fundamental principle of TVC,three types of TVC methods—sine-shape,O-shape,and U-shape TVC—are proposed,each employing distinct vibration trajectories.A prediction model for surface generation of convex microstructures is established based on the fusion of process mechanism and experimental data.Finite element simulations are conducted to analyze the material removal and deformation processes during TVC processing.Surface texturing tests are performed on the aluminum workpieces to verify the efficacy of the proposed TVC in producing various shapes and hybrids of convex microstructures.The experimental results also validate the accuracy of the developed prediction model of the surface morphology of generated microstructures.In addition,the feasibility of TVC on various materials,tool wear after processing,subsurface change of carving,and surface wettability are investigated. 展开更多
关键词 tip-based machining elliptical vibration carving surface texturing convex microstructure
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Microstructures and mechanical properties of friction stir welded and processed high entropy alloys 认领 引用
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作者 Kang Chen Jian Miao +2 位作者 Huijie Zhang Qi Cheng Yingling Wang 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第1期80-108,共29页
High entropy alloys(HEAs)have recently attracted significant attention due to their exceptional mechanical properties and potential applications across various fields.Friction stir welding and processing(FSW/P),as not... High entropy alloys(HEAs)have recently attracted significant attention due to their exceptional mechanical properties and potential applications across various fields.Friction stir welding and processing(FSW/P),as notable solid-state welding and processing techniques,have been proved effectiveness in enhancing microstructures and mechanical properties of HEAs.This review article summarizes the current status of FSW/P of HEAs.The welding materials and conditions used for FSW/P in HEAs are reviewed and discussed.The effects of FSW/P on the evolutions of grain structure,texture,dislocation,and secondary phase for different HEAs are highlighted.Furthermore,the influences of FSW/P on the mechanical properties of various HEAs are analyzed.Finally,potential applications,challenges,and future directions of FSW/P in HEAs are forecasted.Overall,FSW/P enable to refine grains of HEAs through dynamic recrystallization and to activate diverse deformation mechanisms of HEAs through tailoring phase structures,thereby significantly improving the strength,hardness,and ductility of both single-and dual-phase HEAs.Future progress in this field will rely on comprehensive optimization of processing parameters and alloy composition,integration of multi-scale modeling with advanced characterization for in-depth exploration of microstructural mechanisms,systematic evaluation of functional properties,and effective bridging of the gap between laboratory research and industrial application.The review aims to provide an overview of recent advancements in the FSW/P of HEAs and encourage further research in this area. 展开更多
关键词 High entropy alloys Friction stir welding/processing Microstructure Mechanical property
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Laser-Directed Energy Deposition-Induced Hierarchical Multiscale Microstructures With In Situ L12 Nanoprecipitates and Core-Shell Structures in a Medium-Entropy Alloy 认领 引用
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作者 Nan Wang Yang Lv +9 位作者 Hongge Li Tianxu Zhao Yonggang Sun Pengcheng Che Zehao Li Yihang Zhou Zhiliang Ning Jianfei Sun Tung Lik Lee Yongjiang Huang 《Rare Metals》 SCIE EI CAS CSCD 2026年第5期558-572,共15页
Simultaneously achieving high strength,adequate ductility,and low anisotropy remains challenging for additively manufactured medium-entropy alloys(MEAs),particularly without relying on post-processing.Here,a CO28Cr... Simultaneously achieving high strength,adequate ductility,and low anisotropy remains challenging for additively manufactured medium-entropy alloys(MEAs),particularly without relying on post-processing.Here,a CO28Cr18Ni42Al6Ti6 MEA was fabricated by laser-directed energy deposition(LDED),enabling effective in situ strengthening through nonequilibrium solidification and intrinsic thermal cycling.As a result,a hierarchical microstructure was developed,consisting of fine-grain clusters enriched with high-angle grain boundaries,coherent L12 nanoprecipitates,and distinctiveγ-Al2O3/β-Ti core-shell structures.Fine-grain clusters together with spatially distributed heterogeneities contributes to the reduced mechanical anisotropy.As a result,the alloy exhibited high strength while retaining good ductility,exhibiting yield strengths of 880±6.2 MPa and 850±7.2 MPa,ultimate tensile strengths of 1200±32.1 MPa and 1150±55.4 MPa,and fracture elongations of 19%±3.5%and 21%±5.5%along the building and scanning directions,respectively.The enhanced mechanical performance was attributed to multiscale strengthening arising from the synergistic L12 nanoprecipitates and core-shell structures,which impeded dislocation motion across multiple length scales while accommodating interfacial strain,thereby sustaining work hardening and retaining ductility. 展开更多
关键词 core-shell structures L12nanoprecipitates mechanical properties medium entropy alloy multiscale hierarchical microstructure
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Regulation of crystal and microstructures of RETaO4(RE=Nd,Sm,Gd.Ho,Er)powders synthesized via co-precipitation 认领 引用 被引量：4
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作者 Jiang Tian Lin Chen +10 位作者 Xunlei Chen Keren Luo Baihui Li Di Zhang Meng Wang Bing Xu Zhiyi Ren Shixiao Yan Xiaoliang Sun Chi Liu Jing Feng 《Journal of Rare Earths》 SCIE EI CAS CSCD 2025年第6期1246-1255,I0006,共10页
Ferroelastic rare earth tantalates(RETaO4)are widely researched as the next-generation thermal barrier coatings(TBCs),and RETaO4powders are hugely significant for synthesizing their coatings.The current research... Ferroelastic rare earth tantalates(RETaO4)are widely researched as the next-generation thermal barrier coatings(TBCs),and RETaO4powders are hugely significant for synthesizing their coatings.The current research used chemical co-precipitation within an automated experimental device to synthesize RETaO4(RE=Nd,Sm,Gd,Ho,Er)powders.The device automatically monitored and controlled the solutions'pH,improving the chemical co-precipitation efficiency.The crystal structure and microstructure of the RETaO4powders can be controlled by changing the annealing temperature,and the materials undergo an m'-m phase transition.The m'-RETaO4powders exhibit nano-size grains,while m-RETaO4powders evince micron-size grains,altered by the annealing temperatures.A simultaneous thermal analysis es-timates the reversive ferroelastic tetragonal-monoclinic phase transition temperatures.Overall,this research focuses on the synthesis,crystal structures,microstructures,and phase transition of the fabricated RETaO4powders. 展开更多
关键词 Rare earth tantalates Chemical co-precipitation method Rare earths Crystal structures Microstructures Annealingtemperatures
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Solvent engineering in perovskite nanocrystal colloid inks for super-fine electrohydrodynamic inkjet printing of color conversion microstructures in micro-LED displays 认领 引用 被引量：4
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作者 Shuli Wang Xuemin Kong +7 位作者 Siting Cai Yunshu Luo Yuxuan Gu Xiaotong Fan Guolong Chen Xiao Yang Zhong Chen Yue Lin 《Chinese Chemical Letters》 SCIE CAS CSCD 2025年第8期554-559,共6页
Super-fine electrohydrodynamic inkjet(SIJ)printing of perovskite nanocrystal(PNC)colloid ink exhibits significant potential in the fabrication of high-resolution color conversion microstructures arrays for fullcolor m... Super-fine electrohydrodynamic inkjet(SIJ)printing of perovskite nanocrystal(PNC)colloid ink exhibits significant potential in the fabrication of high-resolution color conversion microstructures arrays for fullcolor micro-LED displays.However,the impact of solvent on both the printing process and the morphology of SIJ-printed PNC color conversion microstructures remains underexplored.In this study,we prepared samples of CsPbBr3PNC colloid inks in various solvents and investigated the solvent's impact on SIJ printed PNC microstructures.Our findings reveal that the boiling point of the solvent is crucial to the SIJ printing process of PNC colloid inks.Only does the boiling point of the solvent fall in the optimal range,the regular positioned,micron-scaled,conical PNC microstructures can be successfully printed.Below this optimal range,the ink is unable to be ejected from the nozzle;while above this range,irregular positioned microstructures with nanoscale height and coffee-ring-like morphology are produced.Based on these observations,high-resolution color conversion PNC microstructures were effectively prepared using SIJ printing of PNC colloid ink dispersed in dimethylbenzene solvent. 展开更多
关键词 Solvent Perovskite nanocrystal Electrohydrodynamic inkjet printing Color conversion microstructures arrays Micro-LED display
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Progress in additive manufacturing of nickel-based superalloys:materials,processing,microstructures,properties and alloy design 认领 引用 被引量：3
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作者 Li Gong Yu-Bo Li +3 位作者 Xiao-Pei Wang Sai Li Zhi-Gang Yang Hao Chen 《Rare Metals》 SCIE EI CAS CSCD 2025年第10期7041-7087,共47页
Notable advancements have been made in the additive manufacturing(AM)of aerospace materials,driven by the needs for integrated components with intricate geometries and small-lot production of high-value components.Nic... Notable advancements have been made in the additive manufacturing(AM)of aerospace materials,driven by the needs for integrated components with intricate geometries and small-lot production of high-value components.Nickel-based superalloys,pivotal materials for high-temperature bearing components in aeroengines,present significant challenges in the fabrication of complex parts due to their great hardness.Huge attention and rapid progress have been garnered in AM processing of nicklebased superalloys,largely owing to its distinct benefits in the freedom of fabrication and reduced manufacturing lifecycle.Despite extensive research into AM in nickel-based superalloys,the corresponding results and conclusions are scattered attributed to the variety of nickel-based superalloys and complex AM processing parameters.Therefore,there is still a pressing need for a comprehensive and deep understanding of the relationship between the AM processing and microstructures and mechanical performance of nickel-based superalloys.This review introduces the processing characteristics of four primary AM technologies utilized for superalloys and summarizes the microstructures and mechanical properties prior to and post-heat treatments.Additionally,this review presents innovative superalloys specifically accommodated to AM processing and offers insights into the material development and performance improvement,aiming to provide a valuable assessment on AM processing of nickel-based superalloys and an effective guidance for the future research. 展开更多
关键词 Additive manufacturing Nickel-based superalloys Processing optimization Microstructures and mechanical properties Alloy design
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Self-adjusting voxelated electrochemical three-dimensional printing of metallic microstructures 认领 引用 被引量：1
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作者 Xianghe Meng Xiaomo Wu +4 位作者 Xingjian Shen Yan Xu Hao Zhang Mingjun Chen Hui Xie 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2025年第1期420-433,共14页
Microscale metallic structures enhanced by additive manufacturing technology have attracted extensive attention especially in microelectronics and electromechanical devices.Meniscus-confined electrodeposition(MCED)adv... Microscale metallic structures enhanced by additive manufacturing technology have attracted extensive attention especially in microelectronics and electromechanical devices.Meniscus-confined electrodeposition(MCED)advances microscale 3D metal printing,enabling simpler fabrication of superior metallic microstructures in air without complex equipment or post-processing.However,accurately predicting growth rates with current MCED techniques remain challenging,which is essential for precise structure fabrication and preventing nozzle clogging.In this work,we present a novel approach to electrochemical 3D printing that utilizes a self-adjusting,voxelated method for fabricating metallic microstructures.Diverging from conventional voxelated printing which focuses on monitoring voxel thickness for structure control,this technique adopts a holistic strategy.It ensures each voxel’s position is in alignment with the final structure by synchronizing the micropipette’s trajectory during deposition with the intended design,thus facilitating self-regulation of voxel position and reducing errors associated with environmental fluctuations in deposition parameters.The method’s ability to print micropillars with various tilt angles,high density,and helical arrays demonstrates its refined control over the deposition process.Transmission electron microscopy analysis reveals that the deposited structures,which are fabricated through layer-by-layer(voxel)printing,contain nanotwins that are widely known to enhance the material’s mechanical and electrical properties.Correspondingly,in situ scanning electron microscopy(SEM)microcompression tests confirm this enhancement,showing these structures exhibit a compressive yield strength exceeding 1 GPa.The indentation tests provided an average hardness of 3.71 GPa,which is the highest value reported in previous work using MCED.The resistivity measured by the four-point probe method was(1.95±0.01)×10−7Ω·m,nearly 11 times that of bulk copper.These findings demonstrate the considerable advantage of this technique in fabricating complex metallic microstructures with enhanced mechanical properties,making it suitable for advanced applications in microsensors,microelectronics,and micro-electromechanical systems. 展开更多
关键词 additive manufacturing self-adjusting voxelated electrodeposition metallic microstructures 3D printing nanotwinned copper
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Regulation of GNPs on YSZ composites:Phase transformation,microstructures and nanomechanical properties 认领 引用 被引量：1
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作者 Chenkun SUN Xiaodong ZHANG +3 位作者 Hongzhi JI Yiyong WU Oleg V.TOLOCHKO You WANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第6期605-620,共16页
It is one of the big bottleneck problems for graphene to be uniformly distributed in ceramic matrix composites. A two-step approach was applied to prepare Graphene Nanoplatelets/Yt tria-Stabilized Zirconia(GNPs/YSZ) c... It is one of the big bottleneck problems for graphene to be uniformly distributed in ceramic matrix composites. A two-step approach was applied to prepare Graphene Nanoplatelets/Yt tria-Stabilized Zirconia(GNPs/YSZ) composites. Initially, GNPs were combined with YSZ through nanoparticle regranulation technology to obtain uniformly dispersed powders. Subsequently, the prepared powders were sintered by Spark Plasma Sintering(SPS). Systematic investigation was carried out to examine how GNPs regulate the phase, microstructures, and nanomechanical properties of GNPs/YSZ composite ceramics with different sintering temperatures.Results show that the GNPs can inhibit the coalescence of adjacent grains in YSZ ceramics. Herein,we propose that the intensity ratio of 2D peak to G peak of GNPs in Raman spectrum serves as a key indicator to assess the nanomechanical properties of GNPs/YSZ composites. When the intensity ratio of 2D peak to G peak is 0.5–0.6, the GNPs/YSZ composites obtained in the sintering temperature range of 1 200–1 250.C exhibit excellent nanomechanical properties such as hardness,elastic modulus, wear and creep resistance. 展开更多
关键词 GNPs/YSZcomposites Nanoparticle regranulation technology Phase transformation Microstructures Nanomechanical properties
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High-temperature fracture behavior of Ti−22Al−26Nb with different featured microstructures 认领 引用 被引量：1
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作者 Yong-qiang ZHANG Ke-min XUE +2 位作者 Miao MENG Si-liang YAN Ping LI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第4期1155-1167,共13页
The fracture behavior at high temperatures of the Ti−22Al−26Nb alloy,which features duplex lamellar,bimodal,and Widmanstätten structures,was studied.Samples of the alloy were prepared through compression deformat... The fracture behavior at high temperatures of the Ti−22Al−26Nb alloy,which features duplex lamellar,bimodal,and Widmanstätten structures,was studied.Samples of the alloy were prepared through compression deformation in the trans-phase region followed by subsequent heat treatment.The results indicate that at 650℃,the fracture toughness of the Ti−22Al−26Nb alloy is increased by 41.7%compared to that with original microstructures.The content of the B2 phase significantly influences the inherent fracture toughness of the material,while the morphology and distribution of the precipitated phases primarily affect the tortuosity of the crack propagation path.Among the microstructural features,the morphology and geometric orientation of the lamellae most significantly impact the crack path;consequently,the Widmanstätten structure exhibits the most tortuous fracture path.Additionally,a predictive model for fracture toughness is developed,which effectively predicts the fracture toughness of Ti−22Al−26Nb alloys with various microstructures at 650℃. 展开更多
关键词 Ti2AlNb-based alloy featured microstructures fracture toughness prediction model fracture mechanics
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Effect of pre-rolling temperature on microstructures, tensile properties and fracture behaviors of Al-5.9Zn-1.9Mg alloy during thermomechanical treatment 认领 引用
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作者 CHENG Jun-hua GUO Xiao-fang +3 位作者 LIU Chang SHAO Hong-bang LIU Yu HUANG Yuan-chun 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第9期3237-3254,共18页
The microstructures,mechanical properties,and fracture behaviors of an Al-5.9Zn-1.9Mg alloy subjected to thermomechanical treatment across different pre-rolling temperatures have been exhaustively investigated in pres... The microstructures,mechanical properties,and fracture behaviors of an Al-5.9Zn-1.9Mg alloy subjected to thermomechanical treatment across different pre-rolling temperatures have been exhaustively investigated in present work.The pre-deformation temperature exerts a modest influence on grain morphology,while it profoundly impacts the dislocation configurations and precipitation behaviors.Elevating the rolling temperature from ambient to 170℃results in a reduction in dislocation density within grains accompanied by a notable enhancement in their distributional uniformity.While advancing the temperature to 320℃prompts the premature formation of precipitates during deformation,which diminishes the precipitation during the subsequent ageing.Tensile results reveal that the thermomechanical treatment incorporating pre-rolling at 170℃confers a substantial strengthening effect on the alloy on the basis of both grain boundary strengthening and dislocation strengthening stemmed from pre-deformation along with the precipitation strengthening generated by ageing.Furthermore,the microstructure exhibits a relatively scarce presence of inhomogeneous features such as dislocation pile-ups and micro shear bands,contributing favorably to enhance the ductility of the alloy that presents the mixture of cleavage fracture and dimple-induced failure. 展开更多
关键词 Al-Zn-Mg alloy thermomechanical treatment deformation temperature microstructures tensile properties
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Optical Singularities in Photonic Microstructures with Rosette Symmetries:A Unified Theoretical Scheme 认领 引用
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作者 Jie Yang Jiafu Wang +3 位作者 Xinmin Fu Yueting Pan Tie Jun Cui Xuezhi Zheng 《Engineering》 SCIE EI CSCD 2025年第2期59-69,共11页
Optical singularities are topological defects of electromagnetic fields;they include phase singularity in scalar fields,polarization singularity in vector fields,and three-dimensional(3D)singularities such as optical ... Optical singularities are topological defects of electromagnetic fields;they include phase singularity in scalar fields,polarization singularity in vector fields,and three-dimensional(3D)singularities such as optical skyrmions.The exploitation of photonic microstructures to generate and manipulate optical singularities has attracted wide research interest in recent years,with many photonic microstructures having been devised to this end.Accompanying these designs,scattered phenomenological theories have been proposed to expound the working mechanisms behind individual designs.In this work,instead of focusing on a specific type of microstructure,we concentrate on the most common geometric features of these microstructures—namely,symmetries—and revisit the process of generating optical singularities in microstructures from a symmetry viewpoint.By systematically employing the projection operator technique in group theory,we develop a widely applicable theoretical scheme to explore optical singularities in microstructures with rosette(i.e.,rotational and reflection)symmetries.Our scheme agrees well with previously reported works and further reveals that the eigenmodes of a symmetric microstructure can support multiplexed phase singularities in different components,such as out-of-plane,radial,azimuthal,and left-and right-handed circular components.Based on these phase singularities,more complicated optical singularities may be synthesized,including C points,V points,L lines,Néel-and bubble-type optical skyrmions,and optical lattices,to name a few.We demonstrate that the topological invariants associated with optical singularities are protected by the symmetries of the microstructure.Lastly,based on symmetry arguments,we formulate a so-called symmetry matching condition to clarify the excitation of a specific type of optical singularity.Our work establishes a unified theoretical framework to explore optical singularities in photonic microstructures with symmetries,shedding light on the symmetry origin of multidimensional and multiplexed optical singularities and providing a symmetry perspective for exploring many singularity-related effects in optics and photonics. 展开更多
关键词 Optical singularity Optical vortex Photonic microstructures Symmetries Group representation theory
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