Al/Ni multilayer film shows a self-propagating exothermic reaction when a minute external shock is applied. Using the reactive film as a heat source for soldering enables us to complete the bonding process instantaneously within a second because of its fast reaction propagation. However, cracks are introduced in the reacted NiAl layer after bonding, which becomes a big problem in the viewpoint of thermal and mechanical reliability. In this study, a laser-induced multiple points ignition technique is developed, and reaction propagation characteristics and crack introducing phenomenon are investigated toward crack propagation control.

中文翻译：

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用于控制裂纹扩展的 Al/Ni 放热反应膜中的激光诱导多点点火试验

当施加微小的外部冲击时，Al/Ni 多层膜显示出自蔓延的放热反应。使用反应膜作为焊接的热源，由于其快速反应传播，我们可以在一秒钟内立即完成键合过程。然而，在接合后在反应的 NiAl 层中引入裂纹，从热和机械可靠性的角度来看，这成为一个大问题。在这项研究中，开发了一种激光诱导多点点火技术，并针对裂纹扩展控制研究了反应扩展特性和裂纹引入现象。