ULTRASONIC-ATTENUATION IN ALLOYS

Ultrasonic attenuation was evaluated in metallic alloys, NixCu1-x (x = 1.00, 0.70, 0.60, 0.45 and 0) due to phonon-phonon (p-p) interaction and thermoelastic loss in a wide temperature region along [110] crysta llographic direction for longitudinal and shear waves. Ultrasonic Gran eisen parameters, nonlinearity constants and ultrasonic attenuation du e to p-p interaction and thermoelastic loss were determined from 50 K to 500 K using the Born-Mayer and electrostatic potentials. The result s were compared with available experimental results.