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Hot Deformation Behavior and Microstructure Evolution of Platinum 认领 引用
1
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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Titanium alloy with synergistic enhancement of strength and toughness based on molybdenum equivalent design:Microstructure evolution and strengthening-toughening mechanism 认领 引用
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作者 Yi-li Li Hong-ze Fang +3 位作者 Rui-run Chen Jia-qi Hao Bao-hui Zhu Jing-jie Guo 《China Foundry》 SCIE EI CAS CSCD 2026年第2期245-253,共9页
The traditional"trial and error"microstructural control method,with high cost and low efficiency,has become a key issue restricting the development of ultra-high strength and toughness titanium alloys.This s... The traditional"trial and error"microstructural control method,with high cost and low efficiency,has become a key issue restricting the development of ultra-high strength and toughness titanium alloys.This study adopts the molybdenum equivalent(Mo[eq])method to rapidly design Ti-xMo-4Al-4Zr-3Nb-2Cr-1Fe alloys(x=5-9).The as-cast alloys with different Mo[eq]exhibit a single peak of theβphase in XRD.Theβgrains of 5Mo alloy(the lowest Mo[eq])exhibit elongated columnar grain characteristics.As the Mo[eq]increases,theβgrains transition towards a more equiaxed form,resulting in a decrease in aspect ratio and a reduction in grain size.As the Mo[eq]increases,the a phase content gradually decreases and the a phase is almost unobservable in 9Mo alloy(the highest Mo[eq]).The a phase in 5Mo alloy exhibits short rod-shaped shapes with an average length of about2.4μm,while the a phase in 6Mo alloy shows an equiaxed and short rod shapes with the smallest size.The strength,plasticity,and toughness are the lowest in 5Mo alloy,with values of 867 MPa,7.3%,and 56 MPa·m1/2,respectively.However,it reaches its maximum in 6Mo alloy,where the strength,plasticity,and toughness increase to 984 MPa,12.8%,and 74 MPa·m1/2,respectively.The mechanical properties of Ti-xMo-4Al-4Zr-3Nb-2Cr-1Fe alloys are affected mainly by solid-solution strengthening of Mo element,refinement ofβgrain,and changes inα/βphase content.This study lays a certain theoretical foundation for the theoretical research and composition development of new ultra-high strength and toughness titanium alloys. 展开更多
关键词 titanium alloy ultra-high strength and toughness Mo[eq] microstructure evolution strengthening and toughening mechanism
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Effect of Intermediate Layer Processed by High-Pressure Torsion on Microstructure Evolution and Nano-Deformation Behavior of Tungsten-Copper Three-Layer Composites 认领 引用
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作者 Xue Wang Cen Yang +3 位作者 Yonghang Wang Mingming Wang Ying Chen Ping Li 《Computers, Materials & Continua》 SCIE EI 2026年第6期887-902,共16页
Tungsten-copper laminated composites are promising materials for high heat-flux applications,but their performance is often limited by interfacial instability caused by the thermal-mechanical mismatch between tungsten... Tungsten-copper laminated composites are promising materials for high heat-flux applications,but their performance is often limited by interfacial instability caused by the thermal-mechanical mismatch between tungsten and copper.In this study,W/W-30Cu/CuCrZr three-layer composites are fabricated by high-pressure torsion(HPT)processing.Experimental characterization and molecular dynamics(MD)simulations are used to systematically investigate the influence of HPT process parameters and intermediate-layer composition on the evolution of microstructure and mechanical properties.HPT processing significantly refines the grains of the W-xCu composites and enhances their homogeneity.After applying 15 revolutions of HPT on W-30Cu composites,the crystallite size decreases by about 45.3%.The dislocation density increases to 5.95×1014 m−2.The interfacial transition zone of tungsten-copper three-layer composites is continuous and stable after HPT processing,and the microhardness is gradient increasing along the radial direction,showing good stress coordination ability and interfacial bonding characteristics.With the increase of W content,the yield strength of W-xCu alloy increases significantly,but the ductility decreases.The W-30Cu system achieves the optimal balance between strength and ductility.At the same time,in the W/W-Cu/Cu model,as the number of dislocations increases,the yield stress and elastic modulus increase by about 15%and 22%,respectively,indicating that the high-density defects introduced by HPT have a significant strengthening effect on the composite system.This study provides an important theoretical basis and experimental support for the microstructure control and performance optimization of tungsten-copper laminated composite material. 展开更多
关键词 Tungsten-copper laminated composite material high-pressure torsion processing molecular dynamics simulation microstructure evolution nano-deformation behavior
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Microstructure evolution and corrosion behavior of refill friction stir spot welding joint for dissimilar Al alloys 认领 引用 被引量：1
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作者 Fang-yuan JIANG Da ZHANG +3 位作者 Yan-kun MA Jiang-tao XIONG Wei GUO Jing-long LI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第1期80-95,共16页
The dissimilar 2B06 and 7B04 Al alloy joints were prepared by refill friction stir spot welding(RFSSW),and the microstructural evolution and corrosion behavior of the joints were investigated.Based on microstructural ... The dissimilar 2B06 and 7B04 Al alloy joints were prepared by refill friction stir spot welding(RFSSW),and the microstructural evolution and corrosion behavior of the joints were investigated.Based on microstructural analysis,the welded joints exhibit distinct microstructural zones,including the stir zone(SZ),thermomechanically affected zone(TMAZ),and heat-affected zone(HAZ).The grain size of each zone is in the order of HAZ>TMAZ>SZ.Notably,the TMAZ and HAZ contain significantly larger secondary-phase particles compared to the SZ,with particle size in the HAZ increasing at higher rotational speeds.Electrochemical tests indicate that corrosion susceptibility follows the sequence of HAZ>TMAZ>SZ>BM,with greater sensitivity observed at increased rotational speeds.Post-corrosion mechanical performance degradation primarily arises from crevice corrosion at joint overlaps,but not from the changes in the microstructure. 展开更多
关键词 refill friction stir spot welding high strength Al alloy dissimilar joint microstructure evolution corrosion behavior
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Interfacial elemental diffusion behavior and microstructure evolution of DP780/TC4 joints by laser welding with H62 interlayer 认领 引用
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作者 Su-Yun Ye Tao-Tao Li +4 位作者 Rui-Feng Li Kai Qi Xiao-Lin Bi Hua-Wei Sun Gang Song 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第1期427-442,共16页
A thorny problem in the miscible Ti/Fe system is the unavoidable formation of numerous brittle intermetallic compounds(IMCs).Adding H62 interlayer is an essential method to reduce the brittle IMCs or decrease the brit... A thorny problem in the miscible Ti/Fe system is the unavoidable formation of numerous brittle intermetallic compounds(IMCs).Adding H62 interlayer is an essential method to reduce the brittle IMCs or decrease the brittleness.A joint with good formability and tensile properties was obtained.The microstructure and element distribution of the joint were observed by metallographic microscopy,scanning electron microscopy and electron probe microanalysis.The shear resistance exhibited an initial increase,followed by a subsequent decrease,with an increase in heat input.It reached a maximum value of 2470 N at a welding energy of 267 kJ/m.The Fe-Ti brittle IMCs in TC4/DP780 joints are replaced by Fe-Cu phase and Cu-Ti phase,which reduces the brittleness at TC4/DP780 interface.The results show that the TC4/DP780 joint forms numerousα-Cu andγ-Fe solid solutions through the mutual diffusion and solid solution between H62 and TC4 layers of metals,which effectively inhibits the diffusion of Ti atoms and reduces the formation of brittle Ti-Fe IMCs.At the H62/TC4 interface,a composite layer composed of Cu-Ti IMCs and Cu-based solid solutions is formed.The composite layer grows dendritically from the TC4 alloy to the H62 interlayer.The microstructure at the TC4/DP780 interface changes from fine dendrites to coarse dendrites with the increase in Ti content and heat input.When the heat input is lower,the interfacial elements do not react sufficiently.When the heat input is excessive,microcracks appear at the TC4/DP780 interface,which limits the improvement of mechanical properties of TC4/DP780 joint. 展开更多
关键词 TC4/DP780 joint H62 interlayer Shear resistance Microstructure evolution
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Laser shock processing of titanium alloys:A critical review on the microstructure evolution and enhanced engineering performance 认领 引用 被引量：4
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作者 Qian Liu Shuangjie Chu +6 位作者 Xing Zhang Yuqian Wang Haiyan Zhao Bohao Zhou Hao Wang Genbin Wu Bo Mao 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第6期262-291,共30页
Titanium(Ti)and its alloys are frequently utilized as critical components in a variety of engineering ap-plications because of their high specific strength and excellent corrosion resistance.Compared to conven-tional ... Titanium(Ti)and its alloys are frequently utilized as critical components in a variety of engineering ap-plications because of their high specific strength and excellent corrosion resistance.Compared to conven-tional surface strengthening technologies,laser shock peening(LSP)has increasingly attracted attention from researchers and industries,since it significantly improves the surface strength,biocompatibility,fa-tigue resistance,and anti-corrosion ability of Ti and its alloys.Despite numerous studies that have been carried out to elucidate the effects of LSP on microstructural evolution and mechanical properties of Ti and its alloys in recent years,a comprehensive review of recent advancements in the field of Ti and its alloys subjected to LSP is still lacking.In this review,the standard LSP and the novel process designs of LSP assisted by thermal,cryogenic,electropulsing and magnetic fields are discussed and compared.Microstructural evolution,with focuses on the dislocation dynamics,deformation twinning,grain refine-ment and surface amorphization,during LSP processing of Ti alloys is reviewed.Furthermore,the en-hanced engineering performance of the L SP-processed(L SPed)Ti alloys,including surface hardness,wear resistance,fatigue life and corrosion resistance are summarized.Finally,this review concludes by present-ing an overview of the current challenges encountered in this field and offering insights into anticipated future trends. 展开更多
关键词 Laser shock peening Titanium alloys Microstructure evolution Mechanical properties
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Constitutive Model and Microstructure Evolution of Asextruded Ti-6554 Alloy Based on Temperature Rise Correction 认领 引用 被引量：2
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作者 Li Changmin Luo Hengjun +6 位作者 Zhao Ning Guo Shiqi Wei Minggang Xiang Wei Cui Mingliang Xie Jing Huang Liang 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2025年第9期2189-2198,共10页
The hot deformation behavior of as-extruded Ti-6554 alloy was investigated through isothermal compression at 700–950°C and 0.001–1 s−1.The temperature rise under different deformation conditions was calculat... The hot deformation behavior of as-extruded Ti-6554 alloy was investigated through isothermal compression at 700–950°C and 0.001–1 s−1.The temperature rise under different deformation conditions was calculated,and the curve was corrected.The strain compensation constitutive model of as-extruded Ti-6554 alloy based on temperature rise correction was established.The microstructure evolution under different conditions was analyzed,and the dynamic recrystallization(DRX)mechanism was revealed.The results show that the flow stress decreases with the increase in strain rate and the decrease in deformation temperature.The deformation temperature rise gradually increases with the increase in strain rate and the decrease in deformation temperature.At 700°C/1 s−1,the temperature rise reaches 100°C.The corrected curve value is higher than the measured value,and the strain compensation constitutive model has high prediction accuracy.The precipitation of theαphase occurs during deformation in the twophase region,which promotes DRX process of theβphase.At low strain rate,the volume fraction of dynamic recrystallization increases with the increase in deformation temperature.DRX mechanism includes continuous DRX and discontinuous DRX. 展开更多
关键词 as-extruded Ti-6554 alloy temperature rise correction constitutive model microstructure evolution
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Microstructure evolution of K439B Ni-based superalloy casting with varying cross-sections by experiments and simulations 认领 引用 被引量：1
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作者 Da-shan SUI De-peng ZHOU +2 位作者 Yang LIU Yu SHAN An-ping DONG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第4期1182-1196,共15页
Casting experiments and macro-micro numerical simulations were conducted to examine the microstructure characteristics of K439B nickel-based superalloy casting with varying cross-sections during the gravity investment... Casting experiments and macro-micro numerical simulations were conducted to examine the microstructure characteristics of K439B nickel-based superalloy casting with varying cross-sections during the gravity investment casting process.Firstly,microstructure analysis was conducted on the casting using scanning electron microscopy(SEM)and electron backscatter diffraction(EBSD).Subsequently,calculation of the phase diagram and differential scanning calorimetry(DSC)tests were conducted to determine the macro-micro simulation parameters of the K439B alloy,and the cellular automaton finite element(CAFE)method was employed to develop macro-micro modeling of K439B nickel-based superalloy casting with varying cross-sections.The experimental results revealed that the ratio of the average grain area increased from the edge to the center of the sections as the ratio of the cross-sectional area increased.The simulation results indicated that the average grain area increased from 0.885 to 0.956 mm2as the ratio of the cross-sections increased from 6꞉1 to 12꞉1.The experiment and simulation results showed that the grain size became more heterogeneous and the grain shape became more irregular with an increase in the ratio of the cross-sectional area of the casting.CAFE modeling was an effective method to simulate the microstructure evolution of the K439B alloy and ensure the accuracy of the simulation. 展开更多
关键词 K439B nickel-based superalloy cellular automaton cellular automaton finite element method varying cross-section investment casting microstructure evolution
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Investigation on the microstructure evolution of high strength and ductility as-cast Mg-9.5Gd-2.3Y-1Zn-0.5Zr alloy via double peak-aging 认领 引用 被引量：1
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作者 Daiyi Deng Renju Cheng +6 位作者 Bin Jiang Jianbo Li Haijun Wang Yongfeng Zhou Chuntang Yu Haie Zhu Aitao Tang 《Nano Materials Science》 EI CAS CSCD 2025年第5期686-696,共11页
This article reports a systematic investigation on the relationship between the microstructure evolution and mechanical properties of as-cast Mg-9.5Gd-2.3Y-1Zn-0.5Zr(VW92,wt.%)alloy during aging treatment.The results ... This article reports a systematic investigation on the relationship between the microstructure evolution and mechanical properties of as-cast Mg-9.5Gd-2.3Y-1Zn-0.5Zr(VW92,wt.%)alloy during aging treatment.The results indicate that the alloy exhibits obvious double peak-aging characteristics at 180℃,200℃,and 220℃;the first peak-aging appeared at 96 h,48 h,and 48 h,respectively,while the second peak-aging occurred at 204 h,180 h,and 180 h,respectively.Moreover,the strengths of the first peak-aging were higher than those of the second peak-aging.Consequently,the first peak-aging at 200℃ achieved the best mechanical properties,with ultimate tensile strength(UTS),yield strength(YS),and elongation(EL)of 380(±2.0)MPa,255(±1.8)MPa,and 12.8(±1.7)%,respectively.While the strength decreased in the second peak-aging,the elongation increased to 17.2(±0.5)%.The first peak-aging strengthening is ascribed to the participation of the nano-β' phases in the matrix and the long period stacking ordered(LPSO)phases at grain boundaries(GBs).Additionally,the second peak-aging strengthening is associated with the emergence of a relatively new 3D structure comprising longchain-like structural phases β'+β'F tβ1,γ' phases,and LPSO phases within the grain,combined with the fine and uniform LPSO phases at the GBs. 展开更多
关键词 Mg-Gd-Y-Zn-Zr alloy Microstructure evolution Double peak-aging Heat treatment High strength and ductility as-cast magnesium alloy
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Microstructure evolution of laser directed energy deposition process prepared CNTs/WE43 composites during solution and aging treatment 认领 引用 被引量：1
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作者 Lyuyuan Wang Zhaodian Wang +3 位作者 Lei Zhao Yuan Chen Yangfan Fu Dongsheng Wu 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第7期3357-3372,共16页
Solution and aging treatment were conducted on the laser directed energy deposition(LDED)-prepared carbon nanotubes(CNTs)-reinforced WE43(CNTs/WE43)layers to optimize their microstructure and surface properties in thi... Solution and aging treatment were conducted on the laser directed energy deposition(LDED)-prepared carbon nanotubes(CNTs)-reinforced WE43(CNTs/WE43)layers to optimize their microstructure and surface properties in this study.The microstructure of the WE43 and CNTs/WE43 layers was systematically compared.The dissolution of divorced eutectics at the grain boundaries was retarded by CNTs during solution treatment.The spot segregation composed of Mg24Y5,CNTs,and Zr cores in the solution treated CNTs/WE43 layer presented a slight decreasing in Y content.The grain growth of both types of layers underwent three stages:slow,rapid,and steady-state.The significant inhibitory effect of CNTs on the grain growth of the LDED WE43 matrix was more pronounced than the promoting effect of temperature,resulting in a 47%increase at 510℃ and a 35%increase at 540℃ in the grain growth exponent compared to the WE43 layers at 510℃.During the subsequent aging treatment at 225℃,the precipitation sequences from plate-shaped β″to plate-shaped and globular β′ were observed in both types of layers.CNTs can facilitate an increase in the nucleation rate of precipitates,but without accelerating precipitation hardening rate.The long and short diameters of the precipitates in peak-aged state were decreased by 48.5%and 43.1%by addition of CNTs,respectively.The wear resistance of both the WE43 and CNTs/WE43 layers can be significantly enhanced through solution and aging treatment.The enhancement in wear resistance for the CNTs/WE43 layers is considerably greater than that of the WE43 layers. 展开更多
关键词 Laser directed energy deposition Cnts-reinforced we43 composite Heat treatment Microstructure evolution
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Hot deformation behavior and microstructure evolution in premium GH4738 alloy 认领 引用 被引量：1
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作者 Min Guo Jun Zhao +2 位作者 Mai-cang Zhang Asad Ullah Hao Wang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第9期2947-2963,共17页
The hot deformation behavior of the premium GH4738 alloy was investigated in the temperature range of 1313 to 1353 K at strain rates of 0.01 to 1 s−1using the hot compression test.To accurately predict flow stress,... The hot deformation behavior of the premium GH4738 alloy was investigated in the temperature range of 1313 to 1353 K at strain rates of 0.01 to 1 s−1using the hot compression test.To accurately predict flow stress,three novel strain compensation constitutive equations were developed and rigorously assessed.The results indicate that the power function model(correlation coefficients r=0.98544)demonstrates greater prediction accuracy compared to other functions,with a calculated average activation energy of 507.968 kJ mol−1.Additionally,electron backscattered diffraction technology and transmission electron microscopy were used to analyze the evolution of the alloy microstructure during dynamic recrystallization under different deformation conditions.The results show that under high-temperature and large deformation conditions,the dislocation density and the degree of grain rotation increase,which promotes the formation and growth of new recrystallized grains,so that recrystallization is completed when the deformation amount reaches 30%.Besides,the increase in the temperature not only enhances the thermal activation mechanism,but also improves the grain size uniformity and texture consistency.Meanwhile,the carbide inhibits grain overgrowth by pinning grain boundaries,maintaining a fine and uniform grain structure of the alloy,and thereby improving the plasticity of the material. 展开更多
关键词 Premium GH4738 alloy Strain compensation constitutive equation Microstructure evolution Flow behavior Peak stress constitutive model
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Effect of natural aging and pre-aging on microstructure evolution and strengthening ability of Al-Mg-Si alloy during age hardening 认领 引用
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作者 Shu-hui LIU Qing-lin PAN +4 位作者 Hong-feng HUANG Jing WANG De-gui LI Zhi-xin NING Li-li WEI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第11期3578-3594,共17页
The microstructure evolution and strengthening ability of natural aging(NA),delayed aging(DA),and DA after pre-aging(PDA)of Al-Mg-Si alloy were studied.Results show that small and unstable atomic clusters are generate... The microstructure evolution and strengthening ability of natural aging(NA),delayed aging(DA),and DA after pre-aging(PDA)of Al-Mg-Si alloy were studied.Results show that small and unstable atomic clusters are generated during NA,leading to the formation of low-density coarseβʺandβ′phases,thus reducing the strength of DA alloy.However,atomic clusters and GP zones with larger sizes and high Mg/Si molar ratio form during pre-aging treatment.They prevent the generation of clusters during NA and can serve as effective nucleation sites in subsequent artificial aging,which elevates the number density of fineβʺprecipitates and improves the alloy strength.After pre-aging at 175°C,the strengthening capacity of PDA alloy is restored,with hardness and yield strength reaching 95.1%and 101.9%of peak-aged alloy. 展开更多
关键词 pre-aging delayed aging precipitate microstructure evolution strengthening ability Al-Mg-Si alloy
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Microstructure evolution and corrosion behavior of TIG welded joint of a new Mg-Gd-Nd-Zn-Zr alloy during post-weld heat treatment 认领 引用
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作者 Xin Tong Qiman Wang +3 位作者 Guohua Wu Fangzhou Qi Junmin Zhan Liang Zhang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第8期3798-3818,共21页
The corrosion behavior of the tungsten inert gas(TIG)welded Mg-3Nd-3Gd-0.2Zn-0.5Zr alloy with different post-weld heat treatments was systematically investigated.The results show that the corrosion resistance of the s... The corrosion behavior of the tungsten inert gas(TIG)welded Mg-3Nd-3Gd-0.2Zn-0.5Zr alloy with different post-weld heat treatments was systematically investigated.The results show that the corrosion resistance of the sand-cast base material(BM)was inferior to that of the fusion zone(FZ),which was attributed to the larger grain size and exacerbated galvanic corrosion caused by coarser Mg_3(Nd,Gd)eutectic phases and numerousβprecipitates.It is found that post-weld solid-solution(T4)treatment could significantly enhance the corrosion resistance of the joint due to the dissolution of the cathodic second phases and the denser protective film abundant in RE oxides generated in corrosive solution.The precipitation of nanosized phases and Zn-Zr clusters would slightly increase the susceptibility to localized corrosion of the peak-aged(T6) joint.As the main corrosion products,MgO and Mg(OH)2 are distributed throughout the whole corrosion film,while RE oxides and RE hydroxides are mainly distributed in the inner layer,which can be explained by inward oxidation and replacement reactions between RE elements and MgO/Mg(OH)2.Based on the composition and structure of the corrosion product film,a physical model has been proposed for depicting the microstructure evolution associated with the corresponding corrosion behavior of the joints.This work could promote the applications of welded Mg-RE alloy joint in some corrosion environments. 展开更多
关键词 TIG welding Mg-Gd-Nd alloy Heat treatment Microstructure evolution Corrosion behavior
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Multi-physics modeling of laser melted magnesium alloy:Bridging melt pool dynamics to microstructure evolution 认领 引用
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作者 Junying Liu Xuehua Wu +7 位作者 Dongsheng Wang Chunrong Pan Renkai Huang Fang Deng Cijun Shuai Joseph Buhagiar Jing Bai Youwen Yang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第12期6167-6182,共16页
Laser powder bed fusion(LPBF)has revolutionized modern manufacturing by enabling high design freedom,rapid prototyping,and tailored mechanical properties.However,optimizing process parameters remains challenging due t... Laser powder bed fusion(LPBF)has revolutionized modern manufacturing by enabling high design freedom,rapid prototyping,and tailored mechanical properties.However,optimizing process parameters remains challenging due to the trial-and-error approaches required to capture subtle parameter-microstructure relationships.This study employed a multi-physics computational framework to investigate the melting and solidification dynamics of magnesium alloy.By integrating the discrete element method for powder bed generation,finite volume method with volume of fluid for melt pool behavior,and phase-field method for microstructural evolution,the critical physical phenomena,including powder melting,molten pool flow,and directional solidification were simulated.The effects of laser power and scanning speed on temperature distribution,melt pool geometry,and dendritic morphology were systematically analyzed.It was revealed that increasing laser power expanded melt pool dimensions and promoted columnar dendritic growth,while high scanning speeds reduced melt pool stability and refined dendritic structures.Furthermore,Marangoni convection and thermal gradients governed solute redistribution,with excessive energy input risking defects such as porosity and elemental evaporation.These insights establish quantitative correlations between process parameters,thermal history,and microstructural characteristics,providing a validated roadmap for LPBF-processed magnesium alloy with tailored performance. 展开更多
关键词 Laser powder bed fusion Magnesium alloy Multi-physics modeling Microstructure evolution Process optimization
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Mechanical properties and microstructure evolution of T2 copper in multimodal ultrasonic vibration assisted micro-compression 认领 引用
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作者 Weiqiang Wan Zidong Yin +6 位作者 Guangchao Han Ming Yang Jitao Hu Fuchu Liu Linhong Xu Wei Bai Hui Chen 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第5期152-163,共12页
Multimodal ultrasonic vibration(UV)assisted micro-forming has been widely investigated for its advantages of further reducing forming loads and improving forming quality.However,the influence mechanism of different UV... Multimodal ultrasonic vibration(UV)assisted micro-forming has been widely investigated for its advantages of further reducing forming loads and improving forming quality.However,the influence mechanism of different UV modes on microstructure evolution and mechanical properties was still unclear.Mul-timodal UV assisted micro-compression tests on T2 copper with different grains and sample sizes were conducted in this study.The microstructure evolution for different UV modes was observed by EBSD.The results showed that the true stress reduction caused by UV was increased sequentially with tool ultrasonic vibration(TV),mold ultrasonic vibration(MV)and compound ultrasonic vibration(CV).The region of grain deformation was shifted along the direction of UV,and the MV promoted the uniform distribution of deformation stress.The grain refinement,fiber streamline density,grain deformation and rotation degree were further enhanced under CV,due to the synergistic effect of TV and MV.Additionally,a coupled theoretical model considering both acoustic softening effect and size effect was proposed for describing the mechanical properties.And a physical model of dislocation motion in different UV modes was developed for describing the microstructure evolution.The maximum error between the theoretical and experimental results was only 2.39%.This study provides a theoretical basis for the optimization of UV assisted micro-forming process. 展开更多
关键词 Multimodal ultrasonic vibration Microstructure evolution Acoustic softening Size effect Coupling mechanism
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Characterization of hot processing behavior,microstructure evolution and underlying mechanism of GH3230 superalloy during hot deformation 认领 引用
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作者 Biao Zhang Quan Ju +2 位作者 Rui-wen Song Bai-gang Wang Hao Wang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第6期1763-1779,共17页
The hot deformation behavior of GH3230 superalloy under selected deformation conditions ranging from 950 to 1150℃with strain rates ranging from 0.01 to 10 s–1was studied through isothermal hot compression experim... The hot deformation behavior of GH3230 superalloy under selected deformation conditions ranging from 950 to 1150℃with strain rates ranging from 0.01 to 10 s–1was studied through isothermal hot compression experiments.Based on the obtained flow stresses,a strain-compensated Arrhenius-type model was developed for the description of hot deformation behavior,and the consistency of the predicted flow stresses with the experimental values confirms the accuracy of the developed model.Furthermore,the processing maps were constructed and classified into the instability domain,low-dissipation stability domain and high-dissipation stability domain in accordance with the dynamic material model and the instability criterion.Microstructure observations indicated that the instability domain exhibits the adiabatic shear bands formation,and the low-power dissipation domain exhibits partial dynamic recrystallization(DRX),with the temperature increase/strain rate decrease being favorable for the DRX.The high-dissipation stability domain was occupied by uniformly fine equiaxed grains,and was identified as the optimal processing window,which corresponds to the deformation conditions at 1070–1150℃ with strain rates ranging from 0.01 to 0.15 s–1.Moreover,various DRX mechanisms are observed to occur during the hot deformation,which include the discontinuous dynamic recrystallization,characterized by nucleation at bulged boundaries,the continuous dynamic recrystallization with subgrain progressive rotation and the particle stimulated nucleation mechanism with stimulated nucleation of carbide particles. 展开更多
关键词 Nickel-based superalloy Hot deformation Processing map Microstructure evolution Dynamic recrystallization mechanism
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Effect of rolling direction and reduction on microstructure evolution and mechanical properties of Cu/1010 steel bimetal laminated composites 认领 引用
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作者 Bo PENG Jia LIU +5 位作者 Hui-kun WANG Xing-run SHAN Guo-liang LI Zi-di HANG Jin-chuan JIE Ting-ju LI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第9期2969-2987,共19页
The Cu/1010 steel bimetal laminated composites(BLCs)were rolled to different thicknesses to investigate the effect of rolling direction and reduction on the microstructure evolution and mechanical properties.The diffe... The Cu/1010 steel bimetal laminated composites(BLCs)were rolled to different thicknesses to investigate the effect of rolling direction and reduction on the microstructure evolution and mechanical properties.The difference of mechanical properties between the Cu and 1010 steel causes different thickness reductions,percentage spread,and cladding ratios.The formation of strong texture induces larger strength of the rolled samples,and as the volume fraction of 1010 steel is larger in Route-A,its strength is consistently greater than that in Route-B.The obstruction of interface to crystal and dislocation slip results in the formation of interface distortion,inducing dislocation density gradient when the rolling reduction is low in Route-A.The slip planes of the Cu and 1010 steel are more prone to suffer the normal strain,while the shear strain of other crystal planes is obviously larger than the normal strain under rolling load near the interface. 展开更多
关键词 Cu/steel bimetal laminated composite rolling microstructure evolution mechanical properties deformation behavior
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Influence of Microstructures on Hot Deformation Behavior and Microstructure Evolution of FGH4113A Superalloy 认领 引用
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作者 Yang Jinlong Xiong Jiangying +3 位作者 Yin Chao Cheng Junyi Guo Jianzheng Feng Ganjiang 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2025年第4期898-907,共10页
The hot compression curves and deformed microstructures were investigated under various hot deformation conditions in three states:hot isostatic pressing(HIP,A1),HIP+hot extrusion at 1100℃(A2),and HIP+hot extrusion a... The hot compression curves and deformed microstructures were investigated under various hot deformation conditions in three states:hot isostatic pressing(HIP,A1),HIP+hot extrusion at 1100℃(A2),and HIP+hot extrusion at 1150℃(A3).The results show that A2 sample,extruded at 1100℃ with uniform γ+γ′duplex microstructures,demonstrates excellent hot deformation behavior at both 1050 and 1100℃.The true stress-true strain curves of A2 sample maintain a hardening-softening equilibrium over a larger strain range,with post-deformation average grain size of 5μm.The as-HIPed A1 sample and 1150℃ extruded A3 sample exhibit a softening region in deformation curves at 1050℃,and the grain microstructures reflect an incomplete recrystallized state,i.e.combination of fine recrystallized grains and initial larger grains,characterized by a necklace-like microstructure.The predominant recrystallization mechanism for these samples is strain-induced boundary migration.At 1150℃ with a strain rate of 0.001 s-1,the influence of the initial microstructure on hot deformation behavior and resultant microstructure is relatively less pronounced,and postdeformation microstructures are fully recrystallized grains.Fine-grained microstructures are conducive to maximizing the hot deformation potential of alloy.By judiciously adjusting deformation regimes,a fine and uniform deformed microstructure can be obtained. 展开更多
关键词 FGH4113A superalloy initial microstructure hot deformation behavior microstructure evolution
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Microstructure Evolution and Deformation Mechanism of DZ125 Ni-based Superalloy During High-Temperature Creep 认领 引用
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作者 Li Yongxiang Tian Ning +3 位作者 Zhang Ping Zhang Shunke Yan Huajin Zhao Guoqi 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2025年第7期1733-1740,共8页
The microstructure evolution and deformation mechanism of a DZ125 superalloy during high-temperature creep were studied by means of microstructure observation and creep-property tests.The results show that at the init... The microstructure evolution and deformation mechanism of a DZ125 superalloy during high-temperature creep were studied by means of microstructure observation and creep-property tests.The results show that at the initial stage of high-temperature creep,two sets of dislocations with different Burgers vectors move and meet inγmatrix channels,and react to form a quadrilateral dislocation network.Andγ′phases with raft-like microstructure are generated after the formation of dislocation networks.As creep progresses,the quadrilateral dislocation network is gradually transformed into hexagonal and quadrilateral dislocation networks.During steady stage of creep,the superalloy undergoes deformation with the mechanism that a great number of dislocations slip and climb in the matrix across the raft-likeγ′phases.At the later stage of creep,the raft-likeγ′phases are sheared by dislocations at the breakage of dislocation networks,and then alternate slip occurs,which distorts and breaks the raft-likeγ′/γphases,resulting in the accumulation of micropores at the raft-likeγ′/γinterfaces and the formation of microcracks.As creep continues,the microcracks continue to expand until creep fracture occurs,which is the damage and fracture mechanism of the alloy at the later stage of creep at high temperature. 展开更多
关键词 DZ125 Ni-based superalloy creep dislocation network deformation mechanism microstructure evolution
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Indentation-induced deformation twinning in magnesium:Phase-field modeling of microstructure evolution and size effects 认领 引用
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作者 Mohsen Rezaee-Hajidehi Przemysław Sadowski Stanisław Stupkiewicz 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第4期1721-1742,共22页
Magnesium is distinguished by its highly anisotropic inelastic deformation involving a profuse activity of deformation twinning.Instrumented microano-indentation technique has been widely applied to characterize the m... Magnesium is distinguished by its highly anisotropic inelastic deformation involving a profuse activity of deformation twinning.Instrumented microano-indentation technique has been widely applied to characterize the mechanical properties of magnesium,typically through the analysis of the indentation load-depth response,surface topography,and less commonly,the post-mortem microstructure within the bulk material.However,experimental limitations prevent the real-time observation of the evolving microstructure.To bridge this gap,we employ a recently-developed finite-strain model that couples the phase-field method and conventional crystal plasticity to simulate the evolution of the indentation-induced twin microstructure and its interaction with plastic slip in a magnesium single-crystal.Particular emphasis is placed on two aspects:orientation-dependent inelastic deformation and indentation size effects.Several outcomes of our 2D computational study are consistent with prior experimental observations.Chief among them is the intricate morphology of twin microstructure obtained at large spatial scales,which,to our knowledge,represents a level of detail that has not been captured in previous modeling studies.To further elucidate on size effects,we extend the model by incorporating gradient-enhanced crystal plasticity,and re-examine the notion of‘smaller is stronger’.The corresponding results underscore the dominant influence of gradient plasticity over the interfacial energy of twin boundaries in governing the size-dependent mechanical response. 展开更多
关键词 Magnesium alloys Deformation twinning Microano-indentation Microstructure evolution Phase-field method Crystal plasticity
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