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Influence of extrusion conditions on microstructure and mechanical properties of Mg-2Gd-0.3Zr magnesium alloy

查看全文 作　　者：Tianshuo [1]Zhao;Yaobo [1,2]Hu;Chao [1]Zhang;Bing [1]He;Tianxu [1]Zheng;Aitao [1,2]Tang;Fusheng [1,2]Pan 高影响力作者 机构地区：[1]College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;[2]National Engineering Research Center for Magnesium Alloys,Chongqing 400044,China高影响力机构 出　　处：《Journal of Magnesium and Alloys》索引2022年第10卷第2期,共14页高影响力期刊 基　　金：the National Key Research and Development Program of China(No.2016YFB0301102);the Postgraduate Education Fund of Chongqing University(No.201704020). 摘　　要：In general,different extrusion conditions will affect the microstructure of magnesium alloys and further determine the mechanical properties.The effects of extrusion parameters and heat treatment processes such as extrusion speed,pre-forging,annealing time,extrusion ratio and cooling rate on the microstructure,texture evolution and tensile properties of Mg-2Gd-0.3Zr alloys were investigated in this study.Compared with the as-cast alloy,the extrusion process significantly refines the grains and exhibit the rare earth texture.With the increase of extrusion speed and annealing time,the growth of recrystallized grains is accelerated,leading to the increase of elongation.Large pre-forging deformation achieves to refine the grains by promoting recrystallization nucleation,resulting in increased strength of Mg-2Gd-0.3Zr alloy.Decreasing the extrusion ratio or increasing the cooling rate will introduce coarse un-DRXed grains,which transformed the texture into the basal texture.In particular,the effect of rapid cooling on refining the recrystallized grains is also obvious.Different extrusion conditions influence the mechanical properties of the Mg-2Gd-0.3Zr alloy through the grain size,proportion of non-recrystallization region and texture type. 关 键 词：Mg-2Gd-0.3Zr alloy Extrusion conditions Microstructure TEXTURE Mechanical properties
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