Room and cryogenic deformation behavior of AZ61 and AZ61-xCaO(x=0.5,1 wt.%)alloy  

作　　者：Umer Masood Chaudry Hafiz Muhammad Rehan Tariq Nooruddin Ansari Soo Yeol Lee Tea-Sung Jun 

机构地区：[1]Department of Mechanical Engineering,Incheon National University,Incheon 22012,Republic of Korea [2]Research Institute for Engineering and Technology,Incheon National University,Incheon 22012,Republic of Korea [3]Department of Materials Science&Engineering,Chungnam National University,Daejeon 34134,Republic of Korea

出　　处：《Journal of Magnesium and Alloys》2024年第5期1996-2009,共14页镁合金学报（英文）

基　　金：supported by the National Research Foundation of Korea(NRF)grants funded by the Korean government(MSIT)(No.2020R1C1C1004434 and No.RS-202400398068);Incheon National University Research Grant in 2022(2022-0120)。

摘　　要：This study investigates the influence of CaO(0.5,1(wt.%))alloying on the microstructural evolution,texture development and deformation behavior of AZ61 magnesium alloy.The uniaxial tension tests at room(RT)and cryogenic(CT,-150℃)temperature were performed to investigate the twinability and dislocation behavior and its consequent effect on flow stress,ductility and strain hardening rate.The results showed that the AZ61-1CaO exhibited superior strength/ductility synergy at RT with a yield strength(YS)of 223 MPa and a ductility of 23% as compared to AZ61(178 MPa,18.5%)and AZ61-0.5CaO(198 MPa,21%).Similar trend was witnessed for all the samples during CT deformation,where increase in the YS and decrease in ductility were observed.The Mtex tools based in-grain misorientation axis(IGMA)analysis of RT deformed samples revealed the higher activities of prismatic slip in AZ61-CaO,which led to superior ductility.Moreover,subsequent EBSD analysis of CT deformed samples showed the increased fraction of fine{10-12}tension twins and nucleation of multiple{10-12}twin variants caused by higher local stress concentration at the grain boundaries,which imposed the strengthening by twin-twin interaction.Lastly,the detailed investigations on strengthening contributors showed that the dislocation strengthening has the highest contribution towards strength in all samples.

关 键 词：Magnesium TWINNING Twinning variant EBSD Cryogenic deformation 

分 类 号：TG146.22[一般工业技术—材料科学与工程]