Anharmonic model for the elastic constants of bulk metallic glass across the glass transition

ZH Aitken and M Jafary-Zadeh and JJ Lewandowski and YW Zhang, PHYSICAL REVIEW B, 97, 014101 (2018).

DOI: 10.1103/PhysRevB.97.014101

Here we examine the role of anharmonicity in the elastic constants of bulk metallic glasses and develop an anharmonic model to consider the effects of both pressure and temperature across the glass transition. By comparing against reported experimental data and elastic constants obtained from molecular dynamics simulations, we show that the model is able to capture reported elastic constants from cryogenic temperatures through the glass transition and under hydrostatic pressures up to 18 GPa. Microstructural indicators based on short-range order analysis also display strong correlations with the bulk and shear moduli across the range of pressures and temperatures studied. These results not only greatly expand our understanding in the physical origins of elastic properties of bulk metallic glasses but are also of practical interest for application to processing routes for bulk metallic glass materials.

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