Elastic and Anelastic Behavior of Cu3Au at High Temperature

Internal friction and the period of vibration of an orderable alloy Cu 3 Au are measured as functions of temperature between about 310 K and 870 K both in heating and in cooling runs with a fully automatic inverted torsion pendulum. Two distinct internal friction peaks P 2 and P G located at about 680 K and 800 K are identified with the Zener peak and the grain boundary peak, respectively. Around the order-disorder transition temperature the period of vibration changes stepwise with a temperature hysteresis of about 15 K, while no peculiar change in internal friction is observed associated with it. The effects of heat treatments and deformation on all these phenomena are investigated.