physics pp. 389–398 Ultrasonic investigations in intermetallics

Abstract. Ultrasonic attenuation for the longitudinal and shear waves due to phonon– phonon interaction and thermoelastic mechanism have been evaluated in B2 structured in-termetallic compounds AgMg, CuZr, AuMg, AuTi, AuMn, AuZn and AuCd along 〈1 0 0〉, 〈1 1 1 〉 and 〈1 1 0 〉 crystallographic directions at room temperature. For the same evalua-tions, second- and third-order elastic constants, ultrasonic velocities, Grüneisen parame-ters, non-linearity parameter, Debye temperature and thermal relaxation time are also computed. Although the molecular weight of these materials increases from AgMg to AuCd, the obtained results are affected with the deviation number. Attenuation of ul-trasonic waves due to phonon–phonon interaction is predominant over thermoelastic loss. Results are compared with available theoretical and experimental results. The results with other well-known physical properties are useful for industrial purposes