Study of HCP→FCC phase transformation mechanism under different hot compression rates of AZ31 magnesium alloy  

作　　者：Chun Xue Tingzhuang Han Bo Gao Qianhua Yang Zhibing Chu Leifeng Tuo 

机构地区：[1]College of Material Science and Engineering,Taiyuan University of Science and Technology,Taiyuan,030024,China [2]College of Material Science and Engineering,Northwestern Polytechnical University,Xi’an,710060,China [3]Analytical Test Center,Taiyuan University of Science and Technology,Taiyuan,030024,China [4]College of Material Science and Engineering,Central south university,Changsha,410083,China

出　　处：《Journal of Magnesium and Alloys》2024年第9期3685-3697,共13页镁合金学报（英文）

基　　金：supported by the National Key Research and Development Project(No.2018YFB1307902);the National Natural Science Foundation of China(No.52175353,51905366 and 52275382);Shanxi young top tal-ent project,Shanxi Province Science Foundation for Youths(No.201901D211312);Excellent young academic leaders in Shanxi colleges and universities(No.2019045);Excellent Achievements Cultivation Project of Shanxi Higher Education Institutions(No.2019KJ028);Key Research and Development Projects of Shanxi Province(No.201903D121043);Key Research and Development Plan of Shanxi Province(No.202102150401002);Innovative projects in graduate education(NO.XCX211001).

摘　　要：At present,there are few studies on the phase transition during the thermocompression plastic deformation of magnesium alloy.In this study,the evolution model of thermal compression plastic of AZ31 magnesium alloy was constructed by molecular dynamics,and the phase transition relationship between HCP and FCC at different thermal compression rates was studied.By combining GLEEBLE thermal compression experiment with transmission electron microscopy experiment,high-resolution transmission electron microscopy images were taken to analyze the transition rules between HCP and FCC during plastic deformation at different thermal compression rates,and the accuracy of molecular dynamics analysis was verified.It is found that the slip of Shockley’s incomplete dislocation produces obvious HCP→FCC phase transition at low strain rate and base plane dislocation at high strain rate,which makes the amorphous phase transition of HCP→OTHER more obvious,which provides theoretical guidance for the formulation of forming mechanism and preparation process of magnesium alloy.

关 键 词：AZ31 magnesium alloy Compression ratio Phase transition MD simulation TEM analysis 

分 类 号：TG146.22[一般工业技术—材料科学与工程]