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Understanding the superior mechanical properties of Mg-3Al-Zn alloy sheets:Role of multi-type unique textures

International Journal of Minerals,Metallurgy and Materials 2023年第6期30卷 1104-1112页

作者： Jun Xu Jun Zhao Bin Jiang Wenjun Liu Hong Yang Xintao Li Yuehua Kang Nan Zhou Kaihong Zheng Fusheng Pan Institute of New Materials Guangdong Academy of SciencesGuangzhou 510650China School of Mechanical and Electrical Engineering Hunan City UniversityYiyang 413002China National Engineering Research Center for Magnesium Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Chongqing Institute for Advanced Light Metals Chongqing 400030China College of Materials Science and Engineering Chongqing University of TechnologyChongqing 400054China

Mg-3Al-1Zn(AZ31)sheets were produced by transverse gradient extrusion(TGE)process.The flow behavior and dynamic recrystallization during extrusion were systematically analyzed.The microstructures,textures,and mechanical behavior of extruded AZ31 sheet were also analyzed and compared with conventional extruded(CE)sheet.The results showed that fine grain structure and multi-type unique textures were formed in TGE sheet because of the generation of extra flow velocity along transverse direction(TD)and flow velocity gradient along extrusion direction(ED)during extrusion.The basal poles gradually deviated away normal direction(ND)from edge to center of the TGE sheet along TD,and the largest inclination angle at center region reached around 65°.Furthermore,the basal poles inclined from ED to TD 40°-63°,except for the center region of TGE sheet.The TGE sheet presented higher ductility and strain hardening exponent(n-value),but lower yield strength and Lankford value(r-value)in comparison with the CE sheet.Both the basalslip and tensile twins were easy to be activated during deformation,and the largest elongation of 41%and the lowest yield strength of 86.5 MPa were obtained for the ED-center sample in the TGE sheet.

关键词： transverse gradient extrusion multi-type unique textures mechanical properties

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