Rubberlike entropy elasticity of a glassy alloy

The authors report observations of thermal-induced entropy elasticity and the Gough-Joule effect for a glassy alloy, Pd40Cu30Ni10P20, in terms of acoustoelasticity. Seven kinds of elastic parameters of the glassy alloy have been simultaneously measured as a function of temperature ranging from 298to673K. The decrease in elastic moduli and Poisson’s ratio and the increase in tension below the second-order-like phase transition temperature suggest rubberlike thermal dynamic micro-Brownian stretching, described as F(Pa)=0.282T+562, which may be associated with the rotational and vibrational motions of polyhedron clusters.