Interfacial reactions between liquid Ga and solid Au

Interfacial reactions between liquid Ga and solid Au were investigated from room temperature to 150 degrees C. It was found that only one intermetallic phase, AuGa2, was formed at the Ga/Au interface at all temperatures. During storage, the newly formed fresh AuGa2 phase continuously nucleated and grown at room temperature on the preformed AuGa2/Au interface under supercooled liquid Ga. Time exponents for the AuGa2 growth were measured to be 0.91-1.44 and 2.01 at room temperature to 125 degrees C and 150 degrees C, respectively, with an activation energy of 85.4 kJ/mol at 100-150 degrees C. Diffusion of Ga atoms through the AuGa2 grain boundaries was assumed to be the rate-determining step for AuGa2 growth.

Automated summary

Interfacial reactions between liquid Ga and solid Au were investigated, and a single intermetallic phase (AuGa2) was observed at all temperatures. The growth of AuGa2 was mainly driven by supercooled liquid Ga and occurred at the preformed AuGa2/Au interface.