Atomistic Simulations of c+a Pyramidal Slip in Magnesium Single Crystal under Compression
Xiaozhi Tang (MIT & BJTU), Yafang Guo (Beijing Jiaotong University), yue-Sheng Wang (Institute of Engineering Mechanics, Beijing Jiaotong University)
Plasticity at Different Length Scales
Mon 9:00 - 10:30
CIT 219
In our molecular dynamics simulations, various kinds of c+a pyramidal slip are mainly responsible for the deformation of magnesium single crystal under c-axis compression at nano-scale. The c+a pyramidal slip on 2 plane is 1/60-223{-1-122} which has a shorter Burgers vector than previously suggested. The c+a pyramidal slip on 1 plane is 1/311-2-3{10-11} full dislocation which dissociates into two 1/620-2-3 partials. Metastable {11-22} stacking fault was produced by the leading partial. No twinning was found by examining the stepwise movement of the atoms involved, fully supporting the experiment results of micro-compressions carried out recently, and the theoretical analysis on twining formation proposed by our previous work.