Temperature dependence of prismatic slip in a single-crystalline long-period stacking ordered Mg–Zn–Y alloy

Abstract

Micro-double-shear tests were performed in the temperature range of 298–673 K to quantify the temperature dependence of prismatic slip in a long-period stacking ordered Mg85Zn6Y9. The room-temperature critical resolved shear stress (CRSS) for the prismatic slip was measured ~261 MPa, which was an order of magnitude higher than ~28 MPa for the basal slip. Although the basal slip exhibited less temperature dependence of CRSS, the CRSS for the prismatic slip had a gradual transition over 523 K, decreasing to ~110 MPa at 673 K. The prismatic slips were promoted through cross-slip onto the basal plane over the transition temperature.