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

SCRIPTA MATERIALIA

卷:181

Article

Ren, Nannan^1,2  Hu, Lina¹  Wang, Lijin³  Guan, Pengfei² 

[1] Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jinan 250061, Peoples R China

[2] Beijing Computat Sci Res Ctr, Beijing 100193, Peoples R China

[3] Anhui Univ, Sch Phys & Mat Sci, Hefei 230601, Peoples R China

关键词: Metallic glass;    Relaxation;    Dynamic heterogeneity;    Molecular dynamics (MD) simulations;   

DOI  :  10.1016/j.scriptamat.2020.02.012

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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