The Variation of the Principal Elastic Moduli ofCu3Au with Temperature

Abstract

Single crystals of a copper-gold alloy containing 24.92 atomic percent gold were prepared in a vacuum furnace. The crystals were brought to the ordered state at room temperature by an annealing procedure similar to that described by Sykes and Evans. The elastic moduli were measured by the method of the composite piezoelectric oscillator. The elastic moduli are tabulated as a function of temperature over the range 20°C to 450°C. At the critical temperature, 387.5°C, there is a discontinuity in each modulus-$\mathrm{vs}$.-temperature curve. The results indicate that the elastic constants are closely related to the degree of local order.