Dynamic Recrystallization and Texture Evolution of GW94 Mg Alloy During Multi-and Unidirectional Impact Forging  

作　　者：S.S.A.Shah M.G.Jiang D.Wu U.Wasi R.S.Chen 

机构地区：[1]The Group of Magnesium Alloys and Their Applications,Institute of Metal Research,Chinese Academy of SciencesShenyang 110016,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2018年第9期923-932,共10页金属学报（英文版）

基　　金：financially supported by the National Key Research and Development Program of China(No.2016YFB0301104);the National Natural Science Foundation of China(Nos.51531002,51301173 and 51601193);the National Basic Research Program of China(‘‘973 Program’’,No.2013CB632202)

摘　　要：Multi- and unidirectional impact forgings were successfully applied to a （GW94） Mg-RE alloy. The microstructure and texture evolution were investigated systematically. The obtained results indicated that during unidirectional impact forging, a bimodal chain deform microstructure was sustained till last forging pass, whereas { 10-12} extension twins-assisted continuous dynamic recrystallization took place during the multidirectional impact forging （MDIF）. The coalescence and intersection of {10-12} extension twins during MDIF efficiently refined the original coarse grains and led to an almost recrystallized homogeneous microstructure. The texture analysis demonstrated that unidirectional impact forging yielded out the strong basal texture; however, MDIF resulted in non-basal texture, which was attributed to the cooperative effects of continuous DRX, twinning, and MDIF itself during the deformation process.Multi- and unidirectional impact forgings were successfully applied to a （GW94） Mg-RE alloy. The microstructure and texture evolution were investigated systematically. The obtained results indicated that during unidirectional impact forging, a bimodal chain deform microstructure was sustained till last forging pass, whereas { 10-12} extension twins-assisted continuous dynamic recrystallization took place during the multidirectional impact forging （MDIF）. The coalescence and intersection of {10-12} extension twins during MDIF efficiently refined the original coarse grains and led to an almost recrystallized homogeneous microstructure. The texture analysis demonstrated that unidirectional impact forging yielded out the strong basal texture; however, MDIF resulted in non-basal texture, which was attributed to the cooperative effects of continuous DRX, twinning, and MDIF itself during the deformation process.

关 键 词：Magnesium alloys FORGING TWINNING Recrystallization Texture 

分 类 号：TG146.22[一般工业技术—材料科学与工程]