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Linking evolution of heterogeneous microstructure and rheology of granite to 1000℃ 认领 引用 被引量：4
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作者 Liyuan Liu Shengwen Luo +4 位作者 Derek Elsworth Kai Liu Yifan Luo Hongguang Ji Tao Wang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第3期1842-1857,共16页
The study of the effects of thermal damage on the mineral components,microstructure,and macroscopic physico-mechanical properties of rocks can provide valuable references for rock engineering design and long-term safe... The study of the effects of thermal damage on the mineral components,microstructure,and macroscopic physico-mechanical properties of rocks can provide valuable references for rock engineering design and long-term safety evaluations.In this work,we systematically study the evolution of microstructure and variations in the mechanical properties of granite under high-temperature conditions.The microstructural changes and macro-mechanical properties of rocks are investigated across a temperature range of 25℃–1000℃ through the application of characterization techniques,macro-mechanical experiments,and numerical simulations.High temperatures induce the gradual evolution of micropores and mesopores into macropores,culminating in a significant increase in porosity,with the most rapid rate of increase occurring at 400℃.The X-ray diffraction(XRD)results indicate that the high-temperature environment(below 1000℃)specifically affects the intensity of the maximum diffraction peaks and the half-height width(FWHM)of each mineral component in the granite.The scanning electron microscope(SEM)observation confirms the development of fracture and the reduction in cementation between mineral particles under different temperatures.Additionally,uniaxial and triaxial compression tests were conducted using the GCTS mechanical loading system.Experimental results reveal that the threshold temperature for granite damage is 400℃,and the temperature range for the brittle-ductile transition of granite lies roughly between 600℃ and 800℃.Numerical simulations were performed by employing non-homogeneous rock damage theory and a thermal-mechanical-damage coupling model.Simulated results align well with experimental data.Specifically,the simulations demonstrate that high-temperature treatment causes the redistribution of microstructure in granite,resulting in increased heterogeneity and a change in the failure morphology. 展开更多
关键词 High temperature treatment Thermal damage Microstructure evolution Thermal-mechanical-damage coupling Rock heterogeneity
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Effect of Ta addition on microstructure and mechanical properties of Ti46Al1.5Cr8Nb alloy 认领 引用 被引量：2
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作者 Jiang-shan Liang Liao Mi +4 位作者 Hong-ze Fang Xin Ding Xian-fei Ding Bao-hui Zhu Rui-run Chen 《China Foundry》 SCIE EI CAS CSCD 2026年第1期37-44,共8页
The microstructure of high Nb-TiAl alloys was optimized by the addition of a small amount of Ta elements to further improve their properties.A series of Ti46Al1.5Cr8Nb-xTa(x=0.2,0.4,0.6,0.8,1.0,at.%)alloys were prepar... The microstructure of high Nb-TiAl alloys was optimized by the addition of a small amount of Ta elements to further improve their properties.A series of Ti46Al1.5Cr8Nb-xTa(x=0.2,0.4,0.6,0.8,1.0,at.%)alloys were prepared by vacuum arc melting.The microstructure,mechanical properties,and related influencing mechanisms were systematically investigated.The results indicate that the solidification microstructure of the Ti46Al1.5Cr8Nb-xTa alloys comprises theγ-TiAl phase,α2-Ti3Al phase,and B2 phase.As the Ta content increases from 0.2 at.%to 1.0 at.%,the content ofα2phase and B2 phase increases,while theγphase content decreases.Among them,the B2 phase shows the most pronounced change,being significantly refined,with its content increasing from 12.49%to 21.91%.In addition,the average size of the lamellar colony decreases from 160.65 to 94.44μm.The addition of the Ta element shifts the solidification path toward lower aluminum concentrations,leading to changes in phase content.The tantalum-induced increase in the B2 phase and enhanced supercooling at the solidification front provide the basis for lamellar colony refinement.Compressive testing at room temperature reveals that the Ti46 Al1.5 Cr8 Nb0.4 Ta alloy exhibits optimal compressive properties,achieving a compressive strength of 2,434 MPa and a compressive strain of 33.1%.The improvement of its properties is attributed to a combination of lamellar colony refinement,solid solution strengthening resulting from the incorporation of Ta element,and a reduction in the c/a of theγphase. 展开更多
关键词 TiAl alloy Ta element microstructure mechanical properties lamellar colony
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Characterizing soil shrinkage and soil-water retention behaviors of clayey soils with pore-size distribution and microstructure evolution 认领 引用 被引量：2
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作者 Sheng'ao Jia De'an Sun Pan Chen 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第5期3934-3948,共15页
The soil-water retention and soil shrinkage characteristics are both crucial constitutive relations for unsaturated soils.Although existing research has explored the correlation between these two characteristics to so... The soil-water retention and soil shrinkage characteristics are both crucial constitutive relations for unsaturated soils.Although existing research has explored the correlation between these two characteristics to some extent,the underlying mechanisms remain inadequately investigated.To investigate the correlation between the soil-water retention and soil shrinkage behavior,a series of soil-water retention and soil shrinkage tests is performed on compacted clays over a wide suction range(0–367 MPa).The test results show that the pore water in compacted clays is first expelled from large pores in low suction range.The drainage of pore water at low suctions is predominantly responsible for the phase of structural shrinkage in the soil shrinkage curve.The consistency between the characteristic transitional water contents in the soil shrinkage curve(SSC)and the inflection points in the soil-water retention curve(SWRC)is identified for all the compacted clays.The bimodal pore-size distributions(PSDs)of different clayey soils are obtained using the mercury intrusion porosimetry.The bimodal pore-size distribution characterization is the intrinsic factor in shaping the bimodal morphology in the SWRC over a wide suction range.The low proportion of micropores in clays is responsible to the indistinct zero-shrinkage stage of the SSC.The microstructure measured by the scanning electron microscope indicates the manifestation of aggregation effects during desaturation process.The results demonstrate that soil shrinkage is primarily caused by the contraction of inter-aggregate pores,rather than the evolution of intra-aggregate pores.The findings can greatly enhance the understanding of the soil-water retention and mechanical behavior of compacted clays in varying water content conditions. 展开更多
关键词 Clayey soil Soil shrinkage Soil-water retention Pore-size distribution Microstructure
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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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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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Microstructure and mechanical properties evolution of Al−Mg−Sc−Zr alloy fabricated by laser powder bed fusion 认领 引用 被引量：1
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作者 Xiang LI Zheng-jiang GAO Yun-zhong LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第2期337-354,共18页
The densification characterization,phase constitution,precipitation evolution and mechanical performance of Al−Mg−Sc−Zr alloy processed by laser powder bed fusion(LPBF)were systematically investigated.Moreover,the evo... The densification characterization,phase constitution,precipitation evolution and mechanical performance of Al−Mg−Sc−Zr alloy processed by laser powder bed fusion(LPBF)were systematically investigated.Moreover,the evolution of phase constitution and precipitation behavior after heat treatment were characterized by using X-ray diffraction(XRD)and transmission electron microscope(TEM)analysis.The ultimate tensile strength(UTS)of as-built samples ranged from 396.8 to 414.6 MPa as the scanning speed decreased from 1600 to 1000 mm/s.After post heat treatment,the yield strength(YS)increased to(513.1±1.3)MPa,while the UTS increased from(414.6±5.1)to(539.2±1.5)MPa.The significant improvement of mechanical performance was ascribed to the formation of secondary Al3(Sc,Zr)precipitates. 展开更多
关键词 additive manufacturing laser powder bed fusion Al−Mg−Sc−Zr precipitation behavior microstructure mechanical performance
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Effect of heat treatment parameters on microstructure evolution and high-temperature mechanical properties of Ti–43Al–9V–0.2Y rolled plates 认领 引用
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作者 Yang-Jie Gao Hai-Tao Jiang +2 位作者 Shi-Wei Tian Si-Yuan Zhang Zhi-Chao Zhu 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第2期1-16,共16页
The phase transformation and mechanical behavior of Ti-43Al-9V-0.2Y alloy under varied heat treatments were systematically investigated.The cooling phase sequence is identified as β→β+α→α→γ+α(α2)→β+γ+... The phase transformation and mechanical behavior of Ti-43Al-9V-0.2Y alloy under varied heat treatments were systematically investigated.The cooling phase sequence is identified as β→β+α→α→γ+α(α2)→β+γ+α(α2)→β(β0)+γ.Above 1240℃,slow cooling forms lamellar structures via α→γ+α(α2)→β+γ+α(α2),while fast cooling follows α→γ+α→β(β0)+γ;below 1240℃,α→γ+α(α2)dominates.At 800℃ and 1.0×10−4s−1,γphase in duplex microstructures restricts dislocation slip due to low stacking fault energy,promoting dynamic recrystallization.Mixed microstructure(γ/β0 lamellar and duplex microstructure)achieves a remarkable strength-ductility product of 4907 MPa%through synergistic effects:the duplex enhances plasticity,while the lamellar improves strength.In both microstructures,limited dislocation slip/climb in β0 phases creates dislocation density gradients at γ/β0 interfaces,inducing micro-void nucleation and microcracks in β0.γ phase impedes defect propagation,and micro-voids further suppress crack growth.The crack propagation in α2/γ lamellar microstructure depends on stress direction:parallel stress hinders crack initiation and growth,while perpendicular stress promotes crack nucleation and expansion. 展开更多
关键词 TiAl alloy Heat treatment High-temperature tensile test Lamellar microstructure Duplex microstructure
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Fiber-optic microstructured sensors based on abrupt field patterns: theory, fabrication, and applications 认领 引用
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作者 Yuxuan Yi Wanlai Zhu +4 位作者 Zao Yi Zigang Zhou Shubo Cheng Majid Niaz Akhtar Sohail Ahmad 《Opto-Electronic Science》 CAS 2026年第1期13-31,共19页
Fiber-optic sensing technology has the advantages of passivity, anti-electromagnetic interference, longdistancemeasurement, high sensitivity and high accuracy, small size, and adaptability to harsh environments such a... Fiber-optic sensing technology has the advantages of passivity, anti-electromagnetic interference, longdistancemeasurement, high sensitivity and high accuracy, small size, and adaptability to harsh environments such ashigh-vacuum, high-pressure, and strong magnetic fields compared with the traditional electrical sensing technology.However, with the increasing application requirements, how to further improve the sensitivity of fiber-optic sensors,extend the detection limit and improve the maintenance-free capability has become one of the core issues of thecurrent research. This paper reviews the principle, preparation, and application of fiber-optic microstructured sensingbased on abrupt field type. It specifically outlines the development and applications of micro-nano optical fibers,photonic crystal optical fibers, optical fiber gratings and structured optical fibers, and lists the main preparationmethods of two types of micro-nano optical fibers from the basic theory of optical fiber microstructured sensordevices. 展开更多
关键词 fiber-optic microstructure sensing sudden field-type fiber-optic microstructure devices fiber-optic refractive index sensors micro-and nanofibers Wiener fiber preparation
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Hot Deformation Behavior and Microstructure Evolution of Platinum 认领 引用
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作者 Tang Huiyi Luan Baifeng +3 位作者 Zhang Fuen Xiao Yuchen Chai Linjiang Wu Baoan 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2026年第7期1673-1682,共10页
The hot deformation behavior of platinum was investigated through hot compression experiments.A constitutive equation for the prediction of the flow behavior of platinum was derived from analysis of stress-strain curv... The hot deformation behavior of platinum was investigated through hot compression experiments.A constitutive equation for the prediction of the flow behavior of platinum was derived from analysis of stress-strain curves.Using the constitutive equation,the peak stress of platinum during hot working was calculated across varying temperatures and strain rates.Results show that the predicted values have strong agreement with experimental results.Electron backscatter diffraction analysis further reveals the thermal deformation mechanisms under distinct conditions within the safe processing region.The optimal processing parameters are identified as deformation temperatures of 860-910 K and strain rates of 0.01-0.1 s−1.Discontinuous yielding observed at elevated strain rates is attributed to the multiplication and movement of the mobile dislocations at grain boundaries. 展开更多
关键词 platinum microstructure evolution hot deformation processing maps strain rate
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Microstructure and tribological properties of Y2O3-doped Fe-based alloy coatings by laser cladding 认领 引用
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作者 Huo-ping Zhao Li-yao Li +5 位作者 Ming-xue Shen Qiang Hu Han-yu Zhou Ye-long Xiao De-ying Li Shao-peng Liu 《China Foundry》 SCIE EI CAS CSCD 2026年第2期254-262,共9页
The laser-clad Fe45 alloy coating inherently comprises multiple crystalline phases,resulting in a heterogeneous microstructural distribution that influences its performance.In this study,the rare earth yttria(Y2O_(... The laser-clad Fe45 alloy coating inherently comprises multiple crystalline phases,resulting in a heterogeneous microstructural distribution that influences its performance.In this study,the rare earth yttria(Y2O3)was employed to modify laser-clad Fe45 alloy coatings,and the effects of Y2O3 addition on their microstructure,microhardness,and tribological properties were investigated.As the Y2O3 content increases from 0%to 0.3wt.%,the dominant microstructure transforms from columnar crystals to fine cellular and equiaxed crystals.The modified coating with 0.3wt.%Y2O3 achieves a surface hardness of 568 HV0.3and a wear volume of 1,735.41 um~3,representing a 14.06%increase in hardness and a 51.16%reduction in wear volume compared to the undoped coating.Further increasing the Y2O3 content from 0.3wt.%to 0.9wt.%gradually leads to the emergence of a coarser feather-like microstructure,characterized by a dendritic framework with inter-dendritic equiaxed crystals.Concurrently,both the hardness and wear resistance of the coating decrease.Nevertheless,all Y2O3-modified coatings surpass the undoped Fe45 coating in both hardness and wear resistance.Appropriate Y2O3 doping effectively refines the Fe45 alloy coating's microstru cture and induces lattice distortion,thereby enhancing its hardness and wear resistance. 展开更多
关键词 Fe-based alloy laser cladding rare-earth oxide microstructure tribological properties
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Effect of Dendrite FRefinement on Microstructure and Stress Rupture1 Properties of Third-Generation Nickel-Based Single-Crystal Superalloys 认领 引用
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作者 Zhao Yunxing Wang Di +5 位作者 Ma Dexin Wei Jianhui Cheng Bowen Sun Hongyuan Xu Weitai Huang Zaiwang 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2026年第6期1393-1399,共7页
A third-generation single-crystal superalloy WZ30 was used to prepare single-crystal samples with varying dendrite spacings under different processing techniques.The microstructure and stress rupture properties were s... A third-generation single-crystal superalloy WZ30 was used to prepare single-crystal samples with varying dendrite spacings under different processing techniques.The microstructure and stress rupture properties were studied and compared.The results show that,by improving the thermal-insulation effect between heating zone and cooling zone of the directional solidification furnace,the average primary dendrite spacing of the as-cast sample is reduced from 415μm to 251μm,leading to a noticeable refinement of dendrite and eutectic structure.At the same time,dendrite refinement can simultaneously decrease the volume ratio of casting porosity from 2.29%to 0.21%.Additionally,theγ'phase in both the dendritic and inter-dendritic regions undergoes refinement,with a more uniform size distribution and a more regular shape.After the subsequent solid solution and aging treatments,the smaller y'precipitates with higher cubic degree are obtained in samples after dendrite refinement,whose service life at 980°C/280 MPa is improved by 13.8%. 展开更多
关键词 nickel-based single-crystal superalloy dendrite refinement microstructure eutectic γ'phase stress rupture properties
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Effect of Initial Microstructure States on Flow Behavior of Al-Zn-Mg-Cu Alloy During Hot Tensile Deformation 认领 引用
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作者 Wang Shuyan Zhou Yuting +3 位作者 Du Ruibo Long Shuai Lin Haitao Wang Shaoyang 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2026年第2期302-314,共13页
To investigate the influence of Al-Zn-Mg-Cu alloy with as-homogenized and as-rolled initial microstructures on the tensile flow behavior,isothermal tensile tests were conducted on a GLEEBLE-3500 isothermal simulator a... To investigate the influence of Al-Zn-Mg-Cu alloy with as-homogenized and as-rolled initial microstructures on the tensile flow behavior,isothermal tensile tests were conducted on a GLEEBLE-3500 isothermal simulator at temperatures of 380-440℃and strain rates of 0.05-1 s−1.The Johnson-Cook model,Hensel-Spittel model,strain-compensated Arrhenius model,and critical fracture strain model were established.Results show that through the evaluation of the models using the correlation coefficient(R)and the average absolute relative error,the strain-compensated Arrhenius model can represent the flow behavior of the alloy more accurately.Shear bands are more pronounced in the as-homogenized specimens,whereas dynamic recrystallization is predominantly observed in as-rolled specimens.Fracture morphology analysis reveals that a mixed fracture mechanism is prevalent in the as-homogenized specimen,whereas a ductile fracture mechanism is predominant in the as-rolled specimen.The processing maps indicate that the unstable region is reduced in the as-rolled specimens compared with that in the as-homogenized specimens.The optimal hot working windows for the as-homogenized and as-rolled specimens are determined as 410-440℃/0.14-1 s−1and 380-400℃/0.05-0.29 s−1,respectively. 展开更多
关键词 Al-Zn-Mg-Cu alloy tensile flow behavior microstructure constitutive modelling processing map
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A review on the biomedical Ti-Cu alloys:Design,preparation,microstructure and properties 认领 引用
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作者 Kunmao Li Shengfeng Zhou +2 位作者 Jing Liu Feng Yang Chengliang Yang 《Metals Advances》 SCIE EI CAS CSCD 2026年第1期47-67,共21页
In clinical fields with a high risk of infection,such as orthopedics and dentistry,stringent requirements are imposed on the mechanical properties,biocompatibility,and antibacterial performance of biomedical materials... In clinical fields with a high risk of infection,such as orthopedics and dentistry,stringent requirements are imposed on the mechanical properties,biocompatibility,and antibacterial performance of biomedical materials.As an emerging functional biomedical alloy,Titanium-copper(Ti-Cu)alloys have received increasing attention due to their unique composition and microstructure,which endow these materials with favorable mechanical strength,biological activity,and long-lasting antibacterial functionality.However,a systematic summary of the existing research findings remains lacking.In this review,the classification and fundamental properties of Ti-Cu alloys are first outlined.Recent progress in design strategies,fabrication techniques,microstructural characteristics,mechanical behavior,wear resistance,corrosion performance,and biological properties is comprehensively reviewed.Special emphasis is placed on the dual forms of Cu(solid solution Cu and Ti2Cu phase)and their synergistic effects on both mechanical and biological performance.The antibacterial mechanisms and biosafety of Cu are specifically summarized,and its antibacterial efficacy and tissue compatibility are evaluated based on in vitro studies and animal models.Based on these findings,the key challenges associated with the practical application of Ti-Cu alloys are analyzed,and potential directions for optimization and future development are proposed.The review concludes with a concise summary and several forward-looking perspectives. 展开更多
关键词 Biomedical material Ti-Cu alloys Microstructure Processing Antibacterial properties
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Microstructure and mechanical properties of additively manufactured Ti150/Ti180 high-temperature titanium alloys 认领 引用
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作者 Yong TAN Guang-bao MI +3 位作者 Pei-jie LI Ya-di LI Yue-hai QIU Ruo-chen SUN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第5期1493-1507,共15页
Ti150 powders were deposited on the as-forged Ti180 alloy by selective laser melting under different laser powers.The microstructure and mechanical properties of the Ti150/Ti180 bimetallic alloys were systematically s... Ti150 powders were deposited on the as-forged Ti180 alloy by selective laser melting under different laser powers.The microstructure and mechanical properties of the Ti150/Ti180 bimetallic alloys were systematically studied.The results showed that the Ti150/Ti180 bimetallic alloy samples can be categorized into three regions:the forging zone,the bonding zone,and the deposition zone.The forging zone exhibited duplex microstructure.The bonding zone had no macroscopic defects.In the lower region,the Ti180 alloy underwent rapid melting and solidification,and formed a unique microstructure after undergoing multiple thermal cycles.In the upper region,there was a continuous variation in solute element concentrations,leading to the gradual transformation of the microstructure into Widmanstätten structure.The deposition zone consisted of Widmanstätten structure that was composed ofαphase and residualβphase.As the laser power increased,the density in the deposition zone initially increased and then decreased.The main defect type shifted from lack-of-fusion to pores.The tensile properties showed a trend of initial improvement followed by deterioration.When the laser power was 287 W,the deposition zone has the lowest defect content,with a relative density of 99.58%.The ultimate tensile strength and elongation of the sample at room temperature were 1151 MPa and 4.8%,and those at 450℃were 969 MPa and 14.0%,respectively. 展开更多
关键词 high-temperature titanium alloy laser additive manufacturing dual-alloy bonding interface microstructure mechanical properties
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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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Industrial experimental study on effect of different treatments on inclusions, microstructure and mechanical properties of Al-killed low-alloy high-strength steel Q355B 认领 引用
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作者 Qing Liu Min Wang +2 位作者 Hao Wang Li-Dong Xing Yan-Ping Bao 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第2期299-317,共19页
An industrial scale test was conducted to investigate the effects of no treatment,Ca treatment,Ce treatment and Ca+Ce composite treatment on the modification of inclusions,microstructure and mechanical properties of A... An industrial scale test was conducted to investigate the effects of no treatment,Ca treatment,Ce treatment and Ca+Ce composite treatment on the modification of inclusions,microstructure and mechanical properties of Al-killed Q355B steel.Results showed that the stability of the continuous casting process was improved when Ca pretreatment was added before Ce treatment compared to Ce treatment alone.After Ca+Ce composite treatment,the lowest total oxygen content and average diameter,lower number density and the smallest aspect ratio of inclusions were obtained.The thermodynamic calculations showed that the phases stabilized under the Ce-treated and Ca+Ce composite-treated steel compositions were Al11O18Ce+CeAlO3 and CeAlO3+CaO–Al2O3+liquid inclusion,respectively.It was also found that the oxygen content in the steel affects the Ce modification on inclusions and needs to be reduced before modification.The Ca to Ce ratio had a large effect on the composition of inclusions in the case of Ca+Ce composite treatments.Furthermore,adding rare earth Ce could effectively refine the solidification structure,improve micro-segregation,and also obtain finer equiaxed ferrite grains and dense pearlite lamellar structure.Moreover,a small amount of Ce treatment does not have a significant effect on the strength of the steel,but higher cleanliness and finer organization can have a positive effect on the plasticity and toughness of the material. 展开更多
关键词 Q355B steel Cerium Inclusion Microstructure Thermodynamic calculation Mechanical property
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Microstructure and mechanical properties of shear spun Mg-5Zn-1Gd-1Y-1Mn alloy 认领 引用
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作者 Jing-Xiang Zhao Kun-Kun Deng +4 位作者 Yi-Jia Li Cui-Ju Wang Kai-Bo Nie Zhong-Sen Huang Yi-Ming Zhu 《Metals Advances》 SCIE EI CAS CSCD 2026年第4期92-106,共15页
Shear spinning is an important method for metal shell forming.However,due to the poor plasticity of magnesium alloy,limited research exists on its spinning forming.Understanding the microstructure evolution of magnesi... Shear spinning is an important method for metal shell forming.However,due to the poor plasticity of magnesium alloy,limited research exists on its spinning forming.Understanding the microstructure evolution of magnesium alloy during shear spinning is the key to realizing its controllable spinning forming.In this work,the microstructure,mechanical properties and fracture behavior of Mg-5Zn-1Gd-1Y-1Mn(ZGWM5111)alloy formed by shear spinning were investigated,and the dynamic recrystallization behavior and texture evolution during shear spinning were clarified.The results show that compared with the traditional plastic deformation,the thickness reduction of ZGWM5111 alloy in shear spinning is very small,and the microstructure can be changed significantly only by shear stress.The shear stress of the alloy varies during the spinning process,influencing both the recrystallization driving force and subgrain mobility.This leads to an evolution in the recrystallization mechanism,progressing from twin-induced to continuous,and ultimately to discontinuous dynamic recrystallization.Different from the existing research on magnesium.alloys,the recrystallization grains of ZGWM5111 alloy are continuously refined during the spinning process,and the basal texture strength is also continuously enhanced.In addition,the mechanical properties of ZGWM5111 alloy were significantly improved after shear spinning,especially the elongation was doubled compared with that before spinning,which changes the fracture mode from brittle fracture to ductile-brittle mixed fracture. 展开更多
关键词 Mg-Zn-Gd-Y-Mn Shear spinning Microstructure Recrystallization
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Heat treatment effects on microstructure,deformation mechanisms and mechanical response in additive friction stir deposited Mg-Gd-Y-Zr alloy 认领 引用
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作者 Hui Wang Gang Zeng +8 位作者 Chengwei Zhou Yidi Li Biaobiao Yang Ruilin Lai Chenying Shi Dikai Guan Hao Wang Yujie Cui Yunping Li 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第4期313-337,共25页
Additive friction stir deposition(AFSD),as a solid-state-additive manufacturing technique with a high deposition rate,provides an innovative route for fabricating high-performance magnesium(Mg)alloys while avoiding so... Additive friction stir deposition(AFSD),as a solid-state-additive manufacturing technique with a high deposition rate,provides an innovative route for fabricating high-performance magnesium(Mg)alloys while avoiding solidification defects.In this study,the effects of T6 heat treatment on the microstructure,mechanical properties,and deformation mechanisms of an AFSD Mg-9Gd-3Y-0.5Zr(wt.%)alloy were systematically investigated.The AFSD alloy exhibited a heterogeneous onion-ring microstructure composed of alternating fine grains(~3.9μm)enriched with nanoscale cuboid Mg24(Gd,Y)5 precipitates and coarse grains(~10.6μm)containing limited precipitates,which originated from the non-uniform precipitate distribution in the feedstock.The T6 heat treatment eliminated dislocation structures,introduced abundant nano-Mg7(Gd,Y)(β')precipitates and coarsened the fine and coarse grains to ~7.3 and ~67.4μm,respectively.Consequently,the AFSD and AFSD-T6 alloys achieved superior strength-ductility combinations compared to the feedstock,with yield strength/ultimate tensile strength/elongation of 293.5 MPa/330.3 MPa/8.1%and 366.8 MPa/374.3 MPa/5.1%,respectively.The heterogeneous grains induced pronounced hetero-deformation-induced hardening in both conditions,while basalslip activity was progressively enhanced during deformation.However,extensive twinning,particularly double twinning in the coarse grains of the AFSD-T6 alloy,led to reduced ductility.Overall,this work demonstrates that coupling AFSD with tailored heat treatment enables effective microstructural heterogeneity engineering,offering a robust strategy for developing Mg-Gd-Y-Zr alloys with outstanding mechanical performance. 展开更多
关键词 Additive friction stir deposition Mg-rare earth alloy Heat treatment Microstructure Mechanical properties
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Microstructure and mechanical properties of high pressure die casting AE81 magnesium alloy battery module ends 认领 引用
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作者 He-cong Xie Jiang-feng Song +9 位作者 Chuang-ming Li Zhi-hua Dong Ang Zhang Jiang Zheng Dao-yan Yang Wei Ren Xian-yue Qin Hong-fen Feng Dong-xia Xiang Bin Jiang 《China Foundry》 SCIE EI CAS CSCD 2026年第3期291-302,共12页
AE81 magnesium alloy castings for electric vehicle battery module ends were fabricated using high pressure die casting(HPDC).Effects of filling behavior and solidification sequence on the spatial distribution of micro... AE81 magnesium alloy castings for electric vehicle battery module ends were fabricated using high pressure die casting(HPDC).Effects of filling behavior and solidification sequence on the spatial distribution of microstructure and mechanical properties were systematically investigated.The results indicate that along the flow path toward the overflow gate,the area fraction of externally solidified crystals(ESCs)gradually decreases,and the average grain size becomes finer,resulting in a slight increase in yield strength.In addition,the pores'volume fraction significantly affects ductility and tensile strength,with the gate region exhibiting the highest porosity(0.74%)and thus the lowest elongation(4.3%)and ultimate tensile strength(218 MPa).In other regions,the porosity decreases to 0.33%-0.39%,resulting in increased elongation(6%-7%)and higher ultimate tensile strength(235-242 MPa).Analysis of the microstructure-property relationship reveals that the yield strength follows the Hall-Petch relationship,while elongation and tensile strength are negatively correlated with pore volume fraction.This finding elucidates the mechanism behind the formation of performance gradients in HPDC magnesium alloys and provides a theoretical basis for the design of lightweight components in new energy vehicles. 展开更多
关键词 high pressure die casting AE81 magnesium alloy battery module end microstructure mechanical properties pore
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Effect of rolling temperature on microstructure and mechanical properties of Ni-W-Co-Ta alloy 认领 引用
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作者 Jin-jin TANG Yi XIONG +4 位作者 Yong LI Xiao-qin ZHA Xiu-ju DU Hua-fei LI Feng-zhang REN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第3期887-901,共15页
The effect of warm rolling temperature(500-900℃)on the microstructure and mechanical properties was investigated for a Ni-W-Co-Ta alloy to achieve excellent strength-plasticity synergy.The results showed that the all... The effect of warm rolling temperature(500-900℃)on the microstructure and mechanical properties was investigated for a Ni-W-Co-Ta alloy to achieve excellent strength-plasticity synergy.The results showed that the alloy exhibited high-density dislocations and deformation bands when rolled below 750℃.The nano-Ni4W phase precipitated when rolled at 700-900℃,with the higher deformation temperature,the amount and size of precipitates increased.At 900℃,dissolution of the precipitated Ni4W and dynamic recrystallization of the matrix occurred.Consequently,the strength and hardness firstly decreased,then increased,and decreased again as the deformation temperature increased.An excellent strength-plasticity synergy was achieved through the combined effects of precipitation strengthening and deformation twins strengthening of Ni4W:with a tensile strength of 2010 MPa,a yield strength of 1839 MPa,a microhardness of HV 587,and an elongation of 13.2%when the alloy was warm-rolled at 750℃. 展开更多
关键词 Ni-W-Co-Ta alloy warm rolling microstructure mechanical properties
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