Investigations of an Electrodeposited Tin‐Nickel Alloy: I . Thermal Stability by Differential Thermal Analysis and X‐Ray Diffraction

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Abstract
The equiatomic (65 weight per cent Sn) tin‐nickel alloy, which can only be produced by electrodeposition, has found various practical applications. This plated alloy is a nonequilibrium metastable phase since the equilibrium configuration of such an alloy should be a mixture of the two compounds and . Previous investigations have reported that the alloy decomposed at temperatures ranging from 250° to 500°C. This work was conducted to better define the transition point since it can be a deciding factor for many applications. By means of differential thermal analysis it was found on heating at a rate of 5°C/min the alloy decomposed exothermally over the range 350°–380°C with a maximum at 365°C. This was confirmed by x‐ray diffraction analyses (powder and diffractometer methods) of samples heated to just below and just over the transition range. From additional isothermal heat‐treatments and x‐ray diffraction analyses it was concluded that caution should be taken when applications with service temperatures over 300°C are expected.

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