Insights into the texture-dependent strain hardening mechanisms of conform-processed AZ31 Mg alloys:Experimental investigations and VPSC modelingOA
The texture in magnesium(Mg)alloy affects dislocation nucleation and slip transfer,strain distribution(deformation uniformity),which lead to complex strain hardening behaviors.Basal texture-induced anisotropy has long limited the formability and strain hardening of Mg alloys.In this work,the Conform process,characterized by intense shear deformation and continuous self-heating,was applied to forge,shear,and recrystallize the grain orientations of an AZ31 Mg alloy.The origins of texture evolution and its roles in strain hardening were investigated by integrating multiscale experiments with visco-plastic self-consistent(VPSC)modeling.The results demonstrated that the pronounced basal texture,together with the bimodal grain size distribution in the as-received alloy,imparted a higher yield strength but constrained its strain-hardening capability.The Conform-processed alloy,with a texture inclination angle of 64°,exhibited a synergistic deformation mode,characterized by stronger basal slip,earlier and sustained<c+a>activity,and increased twin participation that collectively accommodated plastic deformation.This synergy increased dislocation density,with a significant rise in the proportion of<a>dislocations(from 81.9%to 92.1%)and<c+a>dislocations(from 18.1%to 40.9%)after Conform processing.These changes in dislocation populations enhanced slip-twin transfer,leading to lower yield strength but improved strain-hardening capacity and tensile ductility.These results demonstrated that Conform process provided an effective strategy for tailoring texture-dependent deformation mechanisms and manufacturing Mg alloys with enhanced strength-ductility synergy.
Yang Mo;Jinlong Su;Shudong He;Jialin Yang;Hang Xu;Jie Teng;Hui Zhang;Fulin Jiang
College of Materials Science and Engineering,State Key Laboratory of Cemented Carbide,Hunan University,Changsha 410082,China Department of Mechanical Engineering,National University of Singapore,117575,SingaporeDepartment of Mechanical Engineering,National University of Singapore,117575,SingaporeCollege of Materials Science and Engineering,State Key Laboratory of Cemented Carbide,Hunan University,Changsha 410082,ChinaCollege of Materials Science and Engineering,State Key Laboratory of Cemented Carbide,Hunan University,Changsha 410082,ChinaCollege of Materials Science and Engineering,State Key Laboratory of Cemented Carbide,Hunan University,Changsha 410082,ChinaCollege of Materials Science and Engineering,State Key Laboratory of Cemented Carbide,Hunan University,Changsha 410082,ChinaCollege of Materials Science and Engineering,State Key Laboratory of Cemented Carbide,Hunan University,Changsha 410082,China Hunan Qianlong New Materials Co.,Ltd.,Yueyang 414000,ChinaCollege of Materials Science and Engineering,State Key Laboratory of Cemented Carbide,Hunan University,Changsha 410082,China
矿业与冶金
Mg alloyContinuous extrusionTextureVPSCSlip transferDislocation density
《Journal of Magnesium and Alloys》 2026 (5)
P.452-474,23
supported by the National Natural Science Foundation of China(52374385,52074114)Science and Technology Innovation Program of Hunan Province(2023RC3106)Graduate Training and Innovation Practice Base of Hunan Province,China Scholarship Council and Postgraduate Scientific Research Innovation Project of Hunan Province(QL20230094)the sponsorship of the China Scholarship Council(No.202306130143).
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