Effects of Cerium Addition on Non-basal Slip in Magnesium Single Crystals

Abstract

Cerium, a rare earth element, was alloyed at various ratios with magnesium to create MgCe single crystals which were then subjected to ½ 1100 and ½11 20 tensile tests to clarify effects of cerium on activation of non-basal slips at room temperature. Mg0.016 mol%Ce alloys yielded due to f10 11g twins in ½ 1100 tension tests. Mg0.052 mol%Ce single crystals yielded due to f11 22gh 1 123i second order pyramidal ©c+aª slip (SPCS), similar to pure magnesium single crystals, in ½11 20 tensile tests. Cerium addition decreased critical resolved shear stresses (CRSS) for f10 11g twinning and SPCS. The decrease in CRSS for SPCS likely results from the frequency of sessile (c+a) dislocations decreasing with decreasing stacking fault energy of second order pyramidal planes.

Activities of Non-Basal Slips in Rolled Mg-Li and Mg-Ce Alloys Sheets

“…It has been reported that the critical resolved shear stress (CRSS) for PS [2] and yield stress due to SPCS [3] decreased by lithium addition and CRSS of SPCS [4] decreased by adding cerium. Therefore, by activation of non-basal slips with lithium and cerium addition, improvement of ductility in magnesium alloys would be expected.…”