Hot deformation behavior and workability characteristic of a fine-grained Mg–8Sn–2Zn–2Al alloy with processing map

查看全文 作　　者：Weili [1,2,3]Cheng;Yang [3]Bai;Shichao [3]Ma;Lifei [1,3]Wang;Hongxia [1,3]Wang;Hui [4]Yu

机构地区：[1]Shanxi key Laboratory of Advanced Magnesium-Based Materials, Taiyuan University of Technology, Taiyuan 030024, China;[2]Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024,China;[3]School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;[4]School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300132, China

出　　处：《Journal of Materials Science & Technology》索引2019年第35卷第6期,共12页

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51404166,51704209 and51701060);the Shanxi Scholarship Council of China(No.2014-023);the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(No.2014017);the Shanxi Province Science Foundation for Youths(No.2016021063);the Natural Science Foundation of Hebei Province(No.E2016202130);the Research Foundation from Education Department of Hebei(No.QN2015035);the Outstanding Youth Scholar Science and Technology Innovation Program of Hebei University of Technology(No.2015002) 摘　　要：The hot deformation behavior of a fine-grained Mg–8 Sn–2 Zn–2 Al(TZA822, in wt%) alloy was investigated in the temperature range of 150–350°C and the strain rate of 0.01–10 s^-1 employing thermomechanical simulator. In most of the cases, the material showed typical dynamic recrystallization(DRX) features i.e., a signal peak value followed by a gradual decrease or to reach a steady state. The work hardening rate was found to increase with decreasing temperature and increasing strain rate, while strain rates had great effects on work hardening behavior. Meanwhile, the constitutive analysis indicated that cross-slip of dislocations was likely to be the dominant deformation mechanism. In addition, the processing map at the strain of 0.1–0.7 showed two stability domains with high power dissipation efficiencies and the optimum hot working parameters for the studied alloy was determined to be 350°C/0.01 s^-1 and 350°C/10 s^-1, at which continuous DRX(CDRX) and discontinuous DRX(DDRX) as main softening mechanism. The instability regions occurred at 200–250°C/10 s^-1 and the main flow instability mechanism was twinning and/or flow localization bands, which were prone to induce cracks and caused in-consistent mechanical properties of the alloy. 关键词：Mg-Sn based alloy HOT deformation Processing map Dynamic RECRYSTALLIZATION

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Hot deformation behavior and workability characteristic of a fine-grained Mg–8Sn–2Zn–2Al alloy with processing map

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