【摘要】 对AZ31镁合金搅拌摩擦焊接头进行力学性能实验。拉伸、疲劳实验结果显示,AZ31镁合金搅拌摩擦焊接头抗拉强度可以达到母材强度的92.9％,断裂位置在前进面的机械热影响区,认为是前进面机械热影响区不均匀的层状组织和应力集中作用的结果。扫描电镜显示:断口有明显的撕裂纹和纤维状组织。更多还原

【Abstract】 The mechanical properties on friction stir welded AZ31 magnesium alloy joint were studied. The tensile and fatigue testing results show that the strength of friction stir welded AZ31 magnesium alloy joint can reach to 92. 9% of the base metal. The fracture location is on the thermal mechanical affected zone in the advancing side. This is because of the unequal stratum structure and the stress concentration on this zone. Obvious tearing crack and fiber tissue was observed by scanning electric microscopy.更多还原