Rubber-Like Entropy Elasticity of a Glassy Alloy [1]

Summary

The thermoelastic effect is monopolistically characteristic of rubbers in solids. Here we report observations of thermal-induced entropy elasticity for a glassy alloy, Pd₄₀Cu₃₀Ni₁₀P₂₀ in terms of acoustoelasticity and the Gough–Joule effect. Seven kinds of elastic parameters of the glassy alloy have been simultaneously measured as a function of temperature ranging from 298 to 673 K. The decreases in elastic moduli, Poisson’s ratio, and the increase in tension below the second-order like-phase transition temperature suggest rubber-like thermal dynamic micro-Brownian stretching, described as F (Pa) = 0.282 T + 562, which may be associated with the rotational and vibrational motions of polyhedron clusters. The glassy alloy also showed the Gough–Joule effect at room temperature. In short, the glassy alloy has some rubbery characteristics that we have never before observed for ordinary crystalline alloys and inorganic materials.