Abstract
The effect of thermal cycling on the kinetics of cellular phase transformation in a Cu15wt.%In alloy was studied. The growth velocity was obtained using growth distance measurements obtained by optical microscopy; the interlamellar spacing and the composition of the depleted α phase were measured from bright field images using transmission electron microscopy. The thermally cycled alloys showed a higher rate of growth of cells. The interlamellar spacing and the composition of the α phase remained more or less the same as those for well-annealed alloys. In comparison with the well-annealed alloys, the thermally cycled alloys showed increased values of the diffusivity and chemical driving force and a decrease in the apparent activation energy during cell growth. This is explained in terms of the non-equilibrium structure of the grain boundaries associated with the thermally cycled alloys.
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