Ultrasonic Investigation of High-Entropy Al$_{0.5}$CoCrCuFeNi Alloy at Low Temperature

The temperature dependence of the velocity propagation and the change in the attenuation of plane-polarized ultrasonic waves at a frequency of 50 MHz in the high-entropy Al0.5CoCrCuFeNi alloy is investigated, using the ultrasonic spectroscopy in the temperature range 77-300 K.As found, the acoustic-characteristics' anisotropy of the alloy is due to the growth texture.Significant attenuation of ultrasonic waves is revealed.Its temperature dependence is analysed.The effect of annealing on the studied acoustic characteristics is investigated.The estimate of values of the dynamic Young's modulus, shear modulus, bulk modulus, and Poisson's ratio is made.