High-pressure behaviors of Yb-based bulk metallic glass

The acoustic velocities of Yb62.5Zn15Mg17.5Cu5 bulk metallic glass (BMG) was measured in situ under hydrostatic pressure using a pulse echo overlap method. The elastic constants under high pressure, the equation of state and the Grüneisen parameters of the BMG were determined. It was found that the Yb-based BMG with a soft nature show weaker anharmonic characteristics, and the change in its physical parameters induced by pressure was much bigger than that of other BMGs. The anharmonic effect in BMGs correlates with the molar volume Vm, the bulk modulus K and Poisson’s ratio.