Evolution of microstructure and texture of AZ80 magnesium alloy under hot torsion with constant decreasing temperature rate  

作　　者：Yongbiao Yang Jinxuan Guo Cuiying Wang Wenxuan Jiang Zhimin Zhang Qiang Wang Xing Zhang 

机构地区：[1]College of Materials Science and Engineering,North University of China,Lane 3,Xueyuan Road,Taiyuan,Shanxi 030051,China [2]North Hongyang mechanical and electronic limited company of Henan Province,China

出　　处：《Journal of Magnesium and Alloys》2024年第4期1619-1637,共19页镁合金学报（英文）

基　　金：supported by key technology research and development project of ShanXi province(20201102019);Natural science foundation of Shanxi Province(201901D111167);Shanxi Scholarship Council of China(2020-117)JCKY2018408B003;Magnesium alloy high-performance XXX multi-directional extrusion technology;XX supporting scientific research project(xxxx-2019-021).

摘　　要：Hot torsion tests for AZ80 magnesium alloy were carried out in the temperature range of 380℃-260℃,with a constant decreasing temperature rate of 10℃/s in order to weaken the basal texture and refine the grains.The results indicated that the average grain sizes were refined forming gradient structure with increasing specimen radial position from center(12.2-5.4μm),and that the initial basal texture intensity of the extruded magnesium alloy was weakened from 46.2 to 8.3.Furthermore,the extension twins(ETs)could be disintegrated from the twins forming separated twins with smaller sizes.Interestingly,ETs with the same twin variant intersecting with each other could be coalesced forming grains with similar orientation,while ETs with different twin variants were separated by twins boundaries contributing to grain refinement.Moreover,in addition to the conventional continuous dynamic recrystallized(CDRX)grains with 30˚orientation rotated around C-axis of the parent grains,CDRXed grains with 30˚rotation around a-axis and random rotation axis were also discerned.Besides,the CDRX evolution induced twins were also elaborated,exhibiting the complex competition between CDRX and twining.Hot torsion deformation with constant decreasing temperatures rate is an effective way of grain refinement and texture modification.

关 键 词：Texture Microstructure Hot torsion Decreasing temperature AZ80 

分 类 号：TG146.22[一般工业技术—材料科学与工程]