X-ray diffraction methods were used to study the kinetics of the $\alpha\to\beta$ transformation in Pd exposed to electrochemical saturation with hydrogen. It was established experimentally that the kinetics of the $\alpha\to\beta$ transformation in the Pd-H system is described by the Avraami-type equation containing time to the first power. The observed time dependence of the saturation is related to the fairly high rate of growth of $\beta$-phase nuclei in a bounded volume. The incubation period $t_0$ and the logarithmic rate $\gamma$ of growth of the $\beta$ phase fraction were found to depend on the crystallographic orientation of the regions with respect to the flux of H atoms.
Department of Solid-State Physics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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