Interfacial reactions in In-Sn/Ni couples and phase equilibria of the In-Sn-Ni system

The In-Sn-Ni alloys of various compositions were prepared and annealed at 160degreesC and 240degreesC. No ternary compounds were found; however, most of the binary compounds had extensive ternary solubility. There was a continuous solid solution between the Ni3Sn phase and Ni3Sn phase. The Sn-In/Ni couples, made of Sn-In alloys with various compositions, were reacted at 160degreesC and 240degreesC and formed only one compound for all the Sn-In alloys/Ni couples reacted up to 8 h. At 240degreesC, Ni28In72 phase formed in the couples made with pure indium, In-10at.%Sn and In-11at.%Sn alloys, while Ni3Sn4 phase formed in the couples made of alloys with compositions varied from pure Sn to In12at.%Sn. At 160degreesC, except in the In/Ni couple, Ni3Sn4 formed by interfacial reaction.