Thermomechanical dissipative behaviour of CuZr metallic glasses

M Sepulveda-Macias and G Molnár and A Tanguy, JOURNAL OF NON-CRYSTALLINE SOLIDS, 636, 123028 (2024).

DOI: 10.1016/j.jnoncrysol.2024.123028

We performed molecular dynamics simulations of Zr 50 Cu 50 metallic glass samples submitted to mechanical deformation at different strain rates. The simultaneous measurements of the stress-strain curve, and of the temperature evolution during the cyclic mechanical load, are used to determine the thermo-mechanical constitutive laws at the continuum scale. It is shown that plastic deformation acts as a heat source, but strong finite size effects affect the unfolding of shear bands and its related dissipation rate. Finally, a thermo-mechanical constitutive law is proposed to reproduce quantitatively self-heating processes at different scales.

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