转速对铝铜FSW接头组织与性能影响

采用搅拌摩擦焊设备对3mm厚6082铝合金和T2紫铜进行连接，通过金相显微镜、硬度测试、拉伸实验等，探究转速对焊接接头组织与力学性能影响。结果表明：焊接转速为1000 r/min，焊接速度为50 mm/min，偏移量为0.6 mm，焊缝成形效果最佳，Al/Cu相互嵌入，呈现钩子形态，焊核区出现明显的金属塑性流线，生成Al4Cu9、AlCu、Al2Cu、Al2Cu3金属间化合物；焊核区显微硬度波动大，峰值出现于界面位置，这是由于该处生成Al-Cu金属间化合物造成的；随着转速的增加，抗拉强度先增大后减小，最大抗拉强度可达255 MPa，为Al母材抗拉强度的82%，断裂位置位于铝铜结合处，呈韧性断裂。

Effect of rotational speed on the organization and properties of aluminum-copper hetero-alloy FSW joints

Friction stir welding equipment was used to 3mm thick 6082 aluminum alloy and T2 copper, Through metallurgical microscopy, hardness testing, tensile testing, etc., to explore the impact of rotational speed on the organization and mechanical properties of welded joints. The results show that: The welding speed is 1000 r/min, the welding speed is 50 mm/min, the offset is 0.6mm, the welding seam forming effect is the best, Al/Cu embedding each other, showing the hook morphology; Generation of Al4Cu9, AlCu, Al2Cu, Al2Cu3 intermetallic compounds at the interface;Large fluctuations in microhardness near the interface, with the peak occurring at the interface location, which is caused by the generation of Al-Cu intermetallic compounds there, With the increase of rotational speed, the tensile strength first increases and then decreases, the maximum tensile strength can reach 255MPa, 82% of the tensile strength of Al base material, the fracture location is the combination of aluminum and copper, is ductile fracture.