Abstract
The effect of the Cd concentration on the kinetics of a spontaneous low-temperature structural phase transformation previously observed in the martensite phase of the solid solution In–Cd is investigated. Acoustic, resistive, and calorimetric measurements are performed in the temperature interval 100–340K on samples containing 4.3, 5.5, and 6.6at.% Cd. It is established that the transformation rate increases considerably with increasing Cd concentration. The empirical activation parameters of the transformation are obtained: activation energy U0=0.43eV and period of attempts τ0=5⋅10−9s. It is shown that this transformation has the characteristic features of a first-order phase transition. It is suggested that the low-temperature isothermal instability of the macroscopic properties of the alloy is due to the decomposition of the In-based solid solution. The substantial increase of the decomposition rate with increasing Cd concentration could be due to an increase of the driving force of this process.
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