Abstract
The acoustic velocities of Yb(62.5)Zn(15)Mg(17.5)Cu(5) 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 Gruneisen 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 V(m), the bulk modulus K and Poisson's ratio. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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