THE INFLUENCE OF LINEAR DEFECT ON TWIN MOVEMENT UNDER A SHEAR LOADING IN MAGNESIUM SINGLE CRYSTAL
Due to the hexagonally close-packed (hep) structure of magnesium,magnesium and its alloys exhibit a strong anisotropy and an unlike yielding in tension and compression.Twinning is always regarded as the dominant deformation mode at low temperatures in magnesium and its alloys.Therefore it is important to study the influence of vacancies and linear defects on the movement of twin for a further understanding of the plastic deformation mechanisms of magnesium alloys.In this work,molecular dynamics simulation has been applied to investigate the movement of the 1012;twin.A linear defect is created near the twin boundary.The simulation results indicate that the linear defect impedes twin movement.However,when the applied strain is increasing,the twin can pass through the linear defect,and a similar phase transition region is left behind the twin boundary.
magnesium single crystal linear defect twinning plastic deformation mechanisms
H.G.Qi Y.F.Guo J.Mosler M.Homayonifar
Institute of Engineering Mechanics,Beijing Jiaotong University,Beijing,100044,P.R.China Helmholtz-Zentrum Geesthacht,Institute of Materials Research,Materials Mechanics,D-21502 Geesthacht,
国际会议
The Third International Conference on Heterogeneous Material Mechanics(第三届国际非均匀材料力学会议)
上海
英文
206-209
2011-05-22（万方平台首次上网日期，不代表论文的发表时间）