Third Order Elastic Constants and Anharmonic Properties of theZr_41.2Ti_13.8Cu_12.5Ni_10.0Be_22.5 Bulk Metallic Glass

The longitudinal velocity V_l and shear velocity V_s of ultrasonic wave propagated along arbitrary three perpendicular directions of the Zr_41.2Ti_13.8Cu_12.5Ni_10.0Be_22.5 bulk metallic glass (Zr/Ti BMG) have been measured at ambient pressure, under hydrostatic pressure (up to 0.5 GPa) and uniaxial compression (up to 70 MPa) using the pulse echo overlap method. The third order elastic constants and the Grüneisen parameter related to the anharmonic properties were derived and discussed. It was found that the BMG with marked different microstructural characteristics comparing with the amorphous carbon exhibited different behaviours related to shear vibratory under high pressure.