Twinning behavior of hot extruded AZ31 hexagonal prisms during uniaxial compression  

作　　者：Y.R.Zhao L.L.Chang J.Guo Y.P.Jin 

机构地区：[1]School of Materials Science and Engineering,Shandong University,Jinan,Shandong 250061,China [2]Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials,Ministry of Education,Shandong University,Jinan 250061,China

出　　处：《Journal of Magnesium and Alloys》2019年第1期90-97,共8页镁合金学报（英文）

基　　金：The work was supported by the National Natural Science Foundation of China(No.5140115);the Promotive Research Fund for Excellent Young and Middle-aged Scientists of Shandong Province(No.BS2013CL034);Independent Inno-vation Foundation of Shandong University(No.GN2013001);partially by the Fundamental Research Funds of Shan-dong University(2016JC016).

摘　　要：Hot-extruded magnesium alloy AZ31 bar was cut into hexagonal prisms and then compressed at room temperature with the loading direction parallel to the extrusion direction(ED)or perpendicular to ED.The effective stress and strain evolution at center and corner region of the hexagonal prisms was simulated by using DEFORM 3D,while microstructure evolution was characterized by electron backscatter diffraction(EBSD).Relationship between twinning behavior and stress-strain evolution during compression at room temperature was studied.The results indicated that the compressive stress and strain levels at central region of hexagonal prisms were lower than those at the corner parts.EBSD examination revealed that{10-12}twins activate during the compression and the volume fraction of twins at corner parts were less than that at the central parts,which was attributed to twin thickening and coalescence behaviors.Meanwhile,the EBSD map indicated that the arise of{10-11}contraction twins and{10-11}-{10-12}double twins in compressed samples,especially in the corner region with loading axis perpendicular to ED,which were considered to be related to the high stress level at corner region.The dislocation slips led to low-angle boundaries in LA⊥ED and LA//ED.

关 键 词：Magnesium alloy Simulation Microstructure TWINNING COALESCENCE 

分 类 号：TG1[金属学及工艺—金属学]