Ultrasonic attenuation in aluminium

Second- and third-order elastic-constant data have been used to determine the Grüneisen mode, 〈γ〉, average-square Grüneisen constant, 〈γ²〉 and nonlinearity constant D, for Aluminium. The attenuation suffered by longitudinal ultrasonic wave propagating in 〈100〉 and 〈110〉 directions and shear wave polarized along 〈100〉 and 〈1$\text{1}$0〉 directions, due to phonon viscosity and thermoelastic phenomena have been evaluated from two different values of TOEM at 289°K and comparison with observed experimental results has been made also.