OS0124-348 Mg-Y合金におけるI1型積層欠陥と転位の相互作用に関する分子動力学解析

Abstract

We investigated the nature of the interactions between I1-type stacking faults (SF) and non-basal dislocations, which are suggested as the important deformation mode to improve the formability without decreasing the strength in Mg-Y alloys. The atomic models of pure Mg including the I1-SF were deformed using molecular dynamics calculations. We observed the dissociation reaction at both ends of I1-SF, where the partial dislocations on the pyramidal plane, Shockley partial dislocations on the basal plane, and stair-rod dislocations were nucleated. We suggest that the I1-SF is not likely to work as the nucleation source of "multiple" (c+a) dislocations, but as the faults to assist and accommodate the c-axis deformation.