人工时效对7003/7046铝合金搅拌摩擦焊接头组织和力学性能的影响

采用差示扫描量热分析、硬度、室温拉伸实验、背散射电子衍射和透射电子显微镜等手段研究了焊后人工时效对7003-7046异种铝合金搅拌摩擦焊接(FSW)接头的微观组织和力学性能的影响。结果表明：FSW接头后退侧(7046铝合金侧)的硬度明显高于前进侧(7003铝合金侧)，两侧平均硬度的差约为30HV；人工时效后接头的硬度提高，两侧平均硬度的差增大到约50HV，接头的屈服强度提高，抗拉强度略有提高，伸长率几乎不变。根据时效前后FSW接头不同区域微观组织的特征，分析了接头力学性能变化的原因。

Effect of Artificial Aging on Microstructure and Mechanical Properties of Friction Stir Welded Joint of 7003/7046 Al-alloys

The effect of post-weld artificial aging on microstructure and mechanical properties of friction stir welded (FSW) joint of 7003-7046 dissimilar Al-alloys was investigated by means of differential scanning calorimetry, hardness test, room temperature tensile test, backscattered electron diffraction and transmission electron microscopy. The results show that the hardness is significantly higher on the retreating side (7046 Al-alloy side) than that of the advancing side (7003 Al-alloy side), and the average hardness difference between the two sides is about 30HV; After artificial aging, the hardness increases, the yield strength increases significantly, the tensile strength increases slightly, and the elongation has little change of the joint, while the hardness difference increases to about 50HV for the two sides. The reason has been discussed based on the microstructure of different regions of the FSW joint before and after artificial aging treatment.