Temperature dependence of elastic moduli in bulk metallic glasses down to liquid nitrogen temperature

Abstract

Temperature dependences of elastic moduli for representative bulk metallic glasses (BMGs) are in situ studied by the ultrasonic method down to liquid nitrogen temperature. The elastic moduli display a monotonous increase with the decreasing temperature, and the temperature dependences of the elastic moduli can be well described by the Varshni expression for various BMGs. The elastic Grüneisen parameters, the molar specific heat, and the Debye temperature in low temperature limit are obtained for the BMGs and compared to those of nonmetallic glasses. The results might provide useful information for understanding the unique properties of the BMGs © 2007 American Institute of Physics.