Kinetics of the Transformation of Metastable Tin‐Nickel Deposits: I . Determination of the Avrami Equation Parameters by DSC or DTA

Abstract

Using both differential scanning calorimetry (DSC) and differential thermal analysis (DTA), the kinetics of the transformation upon heating of the metastable tin‐nickel alloy were studied. The solid‐state reaction proceeds according to a classical Avrami equation. The parameters of the reaction equation were determined, and it is shown that the metastable alloy will not revert to the stable state, for all practical purpose, if kept at temperatures below 100°C. Variations of the kinetic parameters were observed which can explain most of the different stability evaluations reported by different authors.