Structural phase transition mechanism in the alloy CuPd

The high temperature x-ray method is used to study A1-B2 phase transitions in Cu-Pd alloys near a composition of 40 at.% Pd. An anomalous increase in mean square atomic displacements and a non-monotonic change in the lattice parameter with temperature are observed at the onset of the phase transitions. It is shown that upon heating of the quenched solid solution above 300°C the solid solution decomposes with formation of a two-phase mixture A1 + B2. Activation energies of the processes accompanying the structural phase transitions are calculated.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 67–72, June, 1988.