Micromechanics in Mg alloys:Role of hard Al2RE precipitates  

作　　者：Hui Su Junsheng Wang Chengpeng Xue Guangyuan Tian Shuo Wang Xinghai Yang Quan Li Yisheng Miao Zhihao Yang Yanan Meng 

机构地区：[1]School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China [2]Advanced Research Institute of Multidisciplinary Science,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Journal of Materials Science & Technology》2024年第33期112-128,共17页材料科学技术(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.52073030);the National Natural Science Foundation of China-Guangxi Joint Fund(No.U20A20276).

摘　　要：The influence of hard Al_(2)RE phases(Sc,Y,La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,and Lu)on the overall and local deformation as well as damage mechanism of Mg alloys has been studied by using a crystal plasticity model based on dislocation density with a brittle damage criterion.Microcracks that lead to swift damage initiation and propagation throughout the matrix have been predicted.It has been found that the hard Al_(2)RE with higher elastic modulus enhances the damage resistance of the Mg matrix,which was confirmed by fracture SEM/EDS characterizations and phase-field damage simulation.This discovery provides valuable insights for designing Mg alloys with both high stiffness and enhanced damage resistance.

关 键 词：Al_(2)RE phase Dislocation density Damage and fracture CPFEM Deformation behavior 

分 类 号：TG1[金属学及工艺—金属学]