Abstract
Gallium alloys have been attracting significant renewed attention for actively triggerable metals of advanced manufacturing via liquid metal embrittlement. This study is devoted to understanding mechanism of liquid metal embrittlement by a new perspective on the diffusion kinetics of gallium in aluminum matrix. The interfacial diffusion between liquid gallium and pure aluminum has been systematically investigated through sandwich geometry diffusion model analysis at different temperatures. Diffusion activation energy and diffusion coefficient of Al/Ga diffusion couple were calculated, and the diffusion kinetics model was established as well. The diffusion activation energy of gallium in aluminum matrix can be estimated to be 41.5 kJ/mol. The relationship between the mean-squared diffusion distance, time and temperature is the following: d=0.178exp(−4990T)t.
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