文献类型：期刊文献

英文题名：Reducing tension - compression yield asymmetry by free end torsion in extruded Mg alloy

作者：Chen, H. B. Liu, T. M. Zhang, Y. Zhai, Y. B. He, J. J.

第一作者：Chen, H. B.

通信作者：Chen, HB[1];Chen, HB[2]

机构：[1]Southwest Univ, Coll Engn & Technol, Chongqing 400716, Peoples R China;[2]Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China;[3]Guizhou Inst Technol, Sch Mat & Met Engn, Guiyang 550003, Guizhou, Peoples R China

第一机构：Southwest Univ, Coll Engn & Technol, Chongqing 400716, Peoples R China

通信机构：corresponding author), Southwest Univ, Coll Engn & Technol, Chongqing 400716, Peoples R China;corresponding author), Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China.

年份：2016

卷号：32

期号：2

起止页码：111-118

外文期刊名：MATERIALS SCIENCE AND TECHNOLOGY

收录：;EI(收录号：20161402182695);Scopus(收录号：2-s2.0-84962290028);WOS:【SCI-EXPANDED(收录号:WOS:000374878200003)】；

基金：The present work was supported by the Fundamental Research Funds for the Central University (grant no. XDJK2013C106) and in part by the National Natural Science Foundation of China (grant no. 51201140).

语种：英文

外文关键词：Magnesium alloys; Twinning; Slip; Yield asymmetry; Free end torsion

摘要：Free end torsion was carried out on extruded Mg alloy AZ31. Subsequently, tension or compression was implemented on pretorsion specimens. The microstructures of samples with 100 and 200 degrees of pretorsion reveal that no obvious change has occurred; however, samples with 300 and 400 degrees of pretorsion show that there are extensive twins. Compressive yield stress of pretorsion samples increases with increasing pretorsion angle. However, their tensile yield stress exhibits practically the same value with extruded samples. Consequently, yield asymmetry ratio increases from 0.55 of extruded sample to 0.84 of sample with 400 degrees of pretorsion. Both textures rotated around the radial axis by free end torsion, and different deformation mechanisms of compression and tension deformation result in decrease in yield asymmetry.