Acoustic and elastic properties of Cu 3Au alloy in the temperature range of 300.725 К

Anharmonicity of interatomic relations in two-component Cu 3Au alloy with positional order-disorder (Curie Point Т с=661 К) in the temperature range of 300 К and 725 К is studied. It provides calculations on velocities of purely transverse and longitudinal elastic waves, temperature changes of Grüneisen parameter, Poisson’s ratios and elastic moduli along the crystallographic directions [100], [110] and [111] of monocrystal and for Cu 3Au isotope state, based on the stiffness constants с ij(Т) of the crystal.