Effect of welding energy on interface zone of Al-Cu ultrasonic welded joint
Effect of welding energy on interface zone of Al-Cu ultrasonic welded joint
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焊接能量对Al-Cu超声波焊接接头界面区的影响
DOI：
10.1179/1362171813y.0000000114
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发表时间：
2013-05-01
影响因子：
3.3
通讯作者：
Zhang, Y. S.
中科院分区：
文献类型：
--
作者：
Zhao, Y. Y.;Li, D.;Zhang, Y. S.
超声波焊接在异种材料的连接中越来越受到关注。实验研究了焊接能量对Al-Cu超声波焊接接头强度、失效行为和显微组织的影响。结果表明，接头强度最初随着焊接能量的增加而增加，并在 1000 J 时达到最大值，然后显着下降。同时，失效模式从界面脱粘转变为熔核拔出，然后又回到解理失效。在界面区域还观察到具有不同形态和性能的各种微观结构。在较低能量下，接头仅通过大量分散的微结合部分结合。焊接界面出现漩涡状结构，并导致材料在较高能量（类似于 1000 J）下产生机械互锁。然而，在过高的能量下更容易形成空腔缺陷和金属间化合物（IMC）。在2000 J接头中发现了0.5μm厚的IMC层，其主相为Al4Cu9。
Ultrasonic welding is attracting increasing attentions in joining of dissimilar materials. The effect of welding energy on joint strength, failure behaviour and microstructure of Al-Cu ultrasonic welded joint has been experimentally investigated. The results showed that joint strength increased with welding energy initially and reached its maximum at 1000 J, then dropped significantly instead. Meanwhile, the failure mode changed from interfacial debonding to nugget pullout, and then back to cleavage failure. Various microstructures with different morphologies and properties were also observed at the interfacial region. At lower energy, the joint was only partly bonded by numbers of dispersed microbonds. A swirl-like structure appeared at the weld interface and led to a mechanical interlocking between the materials at higher energies (similar to 1000 J). However, cavity defects and intermetallic compound (IMC) were more likely to form under excessively high energies. A 0.5 mu m thick IMC layer with dominant phase of Al4Cu9 was found in 2000 J joint.