Abstract
The isotropic elastic constants of Au-47.5 at.% Cd, and their hydrostatic pressure derivatives, within the temperature interval (10–95°C) of the thermoelastic martensitic transformation, were determined. From the experimental data, using ultrasonic techniques at hydrostatic pressures (up to 5 kbar), the temperature dependence of the isothermal equation of state of the cubic β-phase was calculated. It was found that the low-temperature orthorhombic β′-phase is elastically softer than the cubic β-phase, consequently affecting the β&larr2;gb′ transformation kinetics upon application of hydrostatic pressure. The high values of the Grüneisen parameter, calculated from the pressure derivatives of the sound velocities, in the orthorhombic β′-phase are indicative of a high anharmonicity of interatomic potential in the vicinity of the β′⇇β phase transformation.
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