Loading direction dependence of asymmetric response of pyramidal slip in rolled AZ31 magnesium alloy  

作　　者：Yuzhi Zhu Dewen Hou Kaixuan Chen Zidong Wang 

机构地区：[1]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]Micron School of Materials Science and Engineering,Boise State University,Boise,ID 83725,United States [3]Center for Nanoscale Materials,Argonne National Laboratory,Lemont,IL 60439,United States

出　　处：《Journal of Magnesium and Alloys》2023年第10期3634-3641,共8页镁合金学报（英文）

基　　金：supported by the Bejing Municipal Natural Science Foundation (No.2214072);the Interdisciplinary Research Project for Young Teachers of USTB (Fundamental Research Funds for the Central Universities) (FRF-IDRY-20-034);the Office of China Postdoctoral Council under Award No.YJ20200248。

摘　　要：Textured magnesium alloys usually exhibit anisotropic mechanical behavior due to the asymmetric activation of different twinning and slipping modes.This work focuses on the pyramidal slip responses of rolled AZ31 magnesium alloy under two loading conditions,compressive and tensile loading along the normal direction.Under the condition where the compressive loading direction is closely parallel to the c-axis of the unit cell,tensile twinning and basal slips are prohibited, dislocations then active and tend to accumulate at grain boundaries and form dislocation walls.Meanwhile,these dislocations exhibit zigzag morphologies,which result from the cross-slip from {10■1} first-order pyramidal plane to {11■2} second-order pyramidal plane,then back to {10■1} first-order pyramidal plane.Under the condition where tensile twins are prevalent,{10■1} first-order and {11■2} second-order pyramidal dislocations are favorable to be activated.Both types of dislocations behave climb-like dissociations onto the basal plane,forming zigzag dislocations.

关 键 词：MAGNESIUM pyramidal slip Asymmetry CROSS-SLIP 

分 类 号：TG146.22[一般工业技术—材料科学与工程]