Elastic Properties and Glass Forming Ability of the Zr${}_{50}$Cu${}_{40}$Ag${}_{10}$ Metallic Alloy

Abstract

The elastic properties of the Zr${}_{50}$Cu${}_{40}$Ag${}_{10}$ metallic alloy, such as the bulk modulus $B$, the shear modulus $G$, the Young's modulus $E$ and the Poisson's ratio $\sigma$, are investigated by molecular dynamics simulation in the temperature range $T=250-2000$ K and at an external pressure of $p=1.0$ bar. It is shown that the liquid-glass transition is accompanied by a considerable increase in the shear modulus $G$ and the Young's modulus $E$ (by more than $50\%$). The temperature dependence of the Poisson's ratio exhibits a sharp fall from typical values for metals of approximately $0.32-0.33$ to low values (close to zero), which are characteristic for brittle bulk metallic glasses. Non-monotonic temperature dependence of the longitudinal and transverse sound velocity near the liquid-glass transition is also observed. The glass forming ability of the alloy is evaluated in terms of the fragility index $m$. As found, its value is $m\approx 64$ for the Zr${}_{50}$Cu${}_{40}$Ag${}_{10}$ metallic glass, that is in a good agreement with the experimental data for the Zr-Cu-based metallic glasses.

4 pages, 3 figures

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Cited by in corpus (1)

• Viscous Properties of Nickel-Containing Binary Metal Melts