Revealing a hidden dynamic signature of the non-Arrhenius crossover in metallic glass-forming liquids

NN Ren and LN Hu and LJ Wang and PF Guan, SCRIPTA MATERIALIA, 181, 43-47 (2020).

DOI: 10.1016/j.scriptamat.2020.02.012

We report a scaling collapse of the temperature dependence of structural relaxation in 12 model metallic glass-forming liquids by introducing a characteristic temperature and characteristic time scale under constant dynamic heterogeneity condition. Moreover, we find the onset temperature of cooperative motions, T-A, separating Arrhenius and non-Arrhenius behaviors of the relaxation time turns out to be one of the characteristic temperatures, which is evidenced by the constant dynamic heterogeneity at T-A for all systems investigated. Our findings reveal a new dynamic signature hidden in T-A and offer a new perspective, i.e., constant dynamic heterogeneity condition, to study metallic glass- forming liquids. (C) 2020 Published by Elsevier Ltd on behalf of Acta Materialia Inc.

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