【摘要】 采用电磁脉冲焊接（EMPW）技术对5052铝合金和AZ31镁合金管材进行了焊接，利用扫描电镜（SEM）、能谱分析（EDS）和万能试验机等研究了焊后热处理温度对铝/镁管材EMPW接头微观组织和力学性能的影响。结果表明：焊后热处理会使接头界面形成金属间化合物（IMCs）,焊后热处理温度为200℃时，铝/镁界面处仅形成Al₁₂Mg₁₇ IMC层，焊后热处理温度达到250和300℃时，界面处形成Al₁₂Mg₁₇和Al₃Mg₂ IMCs层，靠近Mg合金侧的为Al₁₂Mg₁₇层，靠近Al合金侧的为Al₃Mg₂层；IMCs的形成会严重影响接头的力学性能，随着焊后热处理温度的升高，焊接接头在拉伸-剪切测试中由铝管母材失效转变焊缝失效；焊后热处理温度≥150℃时，铝/镁EMPW接头均在焊缝处失效，但发生开裂的位置并不相同，可分为沿着靠近Al合金侧焊缝开裂的韧性断裂模式、沿Al₁₂Mg₁₇层开裂的脆性断裂模式和沿着Al₃Mg₂层开裂的脆性断裂模式3种。更多还原

【Abstract】 Electromagnetic pulse welding（EMPW） technology was used to weld 5052 aluminum alloy and AZ31 magnesium alloy tubes. The effects of post-weld heat treatment temperature on microstructure and mechanical properties of EMPW joints of the Al/Mg tubes were studied using scanning electron microscopy（SEM）, energy dispersive spectroscopy（EDS） analysis, and universal testing machine. The results show that the post-weld heat treatment leads to the formation of intermetallic compounds（IMCs） at the interface of the joints. When the post-weld heat treatment temperature is 200 ℃, only the Al₁₂Mg₁₇ IMC layer is formed at the Al/Mg interface. When the post-weld heat treatment temperature reaches 250 ℃ and 300 ℃, Al₁₂Mg₁₇ and Al₃Mg₂ IMC layers are formed at the interface, with the Al₁₂Mg₁₇ layer near the Mg alloy side and the Al₃Mg₂ layer near the Al alloy side. The formation of intermetallic compounds（IMCs） can seriously affect the mechanical properties of the joints. With the increase of post-weld heat treatment temperature, the failure model of the welded joints changes from the failure of the Al tube base metal to the failure of the weld in the tensile-shear test. When the post-weld heat treatment temperature exceeds 150 ℃, the Al/Mg EMPW joints fail at the weld, but the location of cracking is not the same. It can be divided into three types: ductile fracture mode along the weld near the Al alloy side, brittle fracture mode along the Al₁₂Mg₁₇ layer, and brittle fracture mode along the Al₃Mg₂ layer.更多还原