Uniaxial tensile loading was applied to study the mechanical anisotropy of the hot-rolled AZ31 Mg alloy sheet at room temperature. Tensile direction was varied in the transverse plane and in the angles of 0°, 10°, 20° and 45° from the rolling direction. The tensile tests showed an unexpected result that the 10° sample had the best combination of strength and ductility. To clearly explain the anisotropic behaviors, the damage evolution assisted by crystal plasticity finite element model was successfully employed. The simulated results showed that the prismatic and pyramidal slips induced heavy damage in the 0° sample. Also, the pyramidal slip caused the premature failure in the 20° sample. The high-density basal dislocations led to high ductility and low strength in the 45° sample. A new perspective was thus obtained in which the 10° sample sustained slight damage and had the best combination of strength and ductility.

采用单轴拉伸载荷研究了热轧AZ31 Mg合金薄板在室温下的力学各向异性。拉伸方向在横向平面中变化，并且与轧制方向成0°，10°，20°和45°角。拉伸试验显示出出乎意料的结果，即10°样品具有强度和延展性的最佳组合。为了清楚地说明各向异性行为，成功地利用了晶体可塑性有限元模型辅助的损伤演化。仿真结果表明，棱柱形和金字塔形滑移在0°样品中引起了严重破坏。同样，金字塔形滑移会导致20°样品过早失效。高密度基底位错导致45°样品的高延展性和低强度。