The relationship between macro-fracture modes and roles of different deformation mechanisms for the as-extruded Mg–Zn–Zr alloy

The mechanical anisotropy of as-extruded Mg–Zn–Zr plate has been investigated. It indicated that the critical resolve shear stress (CRSS) for basal slip was 60 MPa. Based on macro-shear fracture angles and deformed microstructure, it suggested that for samples with tilt angle β between 30° and 60°, the plastic deformation should rely on basal slip, whereas for samples with tilt angle β greater than 60°, the plastic deformation should be dominated by {1 0 1¯ 2} twinning.