Abstract In this study, a laser high-velocity impact welding of Ta/Cu metal foil was successfully realized under different laser energies and flight distances. The morphology, microstructure, and mechanical properties of welded specimens were investigated via systematic experiments. Results indicated that the plastic deformation of the welded specimens was further pronounced with the increase in laser energy or flight distance. The welding area was ring-shaped, and the variation laws of the effective welding area under different laser energies and flight distances were summarized. The transition of the interface waveform was different when changing the laser energy and flight distance. Energy dispersive spectroscopy results showed that a trace element diffusion formed at the welding interface and intermetallic compounds were absent. Nanoindentation hardness tests showed that the hardness value increased with the decrease in distance from the welding interface. Two main failure modes of the Ta/Cu welding specimens occurred in the tensile shear tests, and the trend of the maximum tensile force under different process parameters was concluded.

中文翻译：

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激光高速冲击焊接Ta/Cu接头的组织和力学性能

摘要 本研究在不同激光能量和飞行距离下成功实现了Ta/Cu金属箔的激光高速冲击焊接。通过系统实验研究了焊接试样的形貌、显微组织和力学性能。结果表明，随着激光能量或飞行距离的增加，焊接试样的塑性变形进一步显着。焊接区域呈环形，总结了不同激光能量和飞行距离下有效焊接区域的变化规律。当改变激光能量和飞行距离时，界面波形的转变是不同的。能量色散谱结果表明焊接界面处形成微量元素扩散和金属间化合物不存在。纳米压痕硬度测试表明，硬度值随着距焊接界面距离的减小而增加。Ta/Cu焊接试样在拉伸剪切试验中出现两种主要失效模式，并得出了不同工艺参数下最大拉力的变化趋势。