In-situ study on hydrogen bubble evolution in the liquid Al/solid Ni interconnection by synchrotron radiation X-ray radiography

Zongye Ding，Qiaodan Hu，Wenquan Lu，Xuan Ge，Sheng Cao，Siyu Sun，Tianxing Yang，Mingxu Xia，Jianguo Li

Shanghai Key Laboratory of Materials Laser Processing Modification, School of Materials Science and Engineering, Shanghai Jiao Tong UniversityMonash Centre for Additive Manufacturing (MCAM), Monash University

摘 要：Synchrotron X-ray radiography was used to carry out an in-situ observation of the hydrogen bubble evolution in the liquid Al/solid Ni interconnection. The individual bubble mainly grows in a stochastic way during heating. The size distribution for groups of bubbles follows a Gaussian distribution in the early stage and Lifshitz-Slyozov-Wagner（LSW） diffusion controlled distribution in the final stage. The intermetallic compounds（IMCs） first form during solidification, following by the hydrogen bubbles. The bubbles between two adjacent Al₃Ni grains grow unidirectionally along the liquid channel, with the bottom being impeded by the Al₃Ni phase and the radius of the growth front being smaller. For the bubbles at triple junctions, they grow along the liquid channel and the crack with morphology transition.

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