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首页> 外文期刊>ISIJ international >Effect of Post-weld Heat Treatment on the Dissimilar Cu/Al Joints Pro-duced by High Power Ultrasonic Spot Welding
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Effect of Post-weld Heat Treatment on the Dissimilar Cu/Al Joints Pro-duced by High Power Ultrasonic Spot Welding

机译：焊后热处理对大功率超声波点焊产生的异种铜铝接头的影响

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The effect of post-weld heat treatment (PWHT) on the microstructure and mechanical properties of ultrasonic spot welded Cu/Al dissimilar joints was studied in this paper. PWHT was performed for 1 h at four different temperatures of 200°C, 300°C, 400°C and 500°C, respectively. The microstructure and mechanical properties of joints were investigated by SEM, EDS, X-ray diffractometer, Microhardness tester and Universal testing machine, respectively. Results showed that no obvious intermetallic (IMC) layer was found at the as-welded joint and joint after PWHT at 200°C. But relatively higher shear strength of 2.458 KN was obtained when the temperature of PWHT was 200°C. As the temperature of PWHT exceeded 300°C, the shear strength of joints reduced obviously, due to the formation of brittle Al–Cu IMC layer. However, when the joint was subjected to PWHT at 500°C, maximum shear strength of 3.138 KN was acquired resulted from the increase of the bonded area, though large numbers of cracks were found at the Cu/Al interface. Besides, obvious grain boundary penetration occurred on the Al base metal adjacent to the Cu/Al interface when the joint after PWHT at 500°C. The micro-hardness at the Cu/Al interface was significantly higher than that of the Cu or Al base metal. With the temperature of PWHT increasing, the micro-hardness decreased both in Cu and Al base metals, but increased significantly at the Cu/Al interface. Fracture mode of joints, both as-welded and after PWHT, were the mixed-mode of ductile and brittle fractures.
机译：研究了焊后热处理（PWHT）对超声点焊Cu / Al异种接头组织和力学性能的影响。在分别于200°C，300°C，400°C和500°C的四个不同温度下进行PWHT 1小时。用SEM，EDS，X射线衍射仪，显微硬度计和Universal试验机分别研究了接头的组织和力学性能。结果表明，在200°C进行PWHT焊接后的接头和接头处均未发现明显的金属间化合物（IMC）层。但是，当PWHT温度为200°C时，可获得相对较高的抗剪强度2.458 KN。当PWHT的温度超过300°C时，由于脆性的Al-Cu IMC层的形成，接头的剪切强度明显降低。然而，当接头在500°C下进行PWHT焊接时，尽管在Cu / Al界面处发现大量裂纹，但由于结合面积的增加而获得的最大剪切强度为3.138 KN。此外，当在500°C下进行PWHT焊接后，在邻近Cu / Al界面的Al基金属上发生了明显的晶界渗透。 Cu / Al界面的显微硬度明显高于Cu或Al贱金属。随着PWHT温度的升高，Cu和Al基金属的显微硬度均降低，但在Cu / Al界面显着提高。焊接后和PWHT后的关节断裂模式是韧性和脆性断裂的混合模式。

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