Mechanism of negative strain rate sensitivity in metallic glass film

被引：27

作者：

Sahu, Bibhu Prasad ^{[1
]}

Dutta, Amlan ^{[1
]}

Mitra, Rahul ^{[1
]}

机构：

[1] Indian Inst Technol Kharagpur, Dept Met & Mat Engn, Kharagpur 721302, W Bengal, India

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 784卷

关键词：

Metallic glass; Nanoindentation; Strain rate sensitivity; Creep; Molecular dynamics simulation; NANOINDENTATION CREEP-BEHAVIOR; SERRATED FLOW; PLASTIC-DEFORMATION; THIN-FILMS; CU; DYNAMICS; EVOLUTION; RANGE; NANOCRYSTALLINE; MICROSTRUCTURE;

D O I：

10.1016/j.jallcom.2019.01.024

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The observation of negative strain rate sensitivity during nanoindentation is a common, yet poorly understood phenomenon in metallic glasses. In this study, a combination of experimental investigation and atomistic simulation has been employed to understand the mechanism behind this perplexing effect. The results suggest that the negative strain rate sensitivity arises out of the influence of a slow time-dependent relaxation process during the driven deformation at a controlled rate. By complementing the experimental outcome by simulation results, it is possible to show that this unification of the rate-driven and relaxation mechanisms is the consequence of their overlapping timescales. In addition, we demonstrate that by using the numerical results of simulated nanoindentation, it is possible to calculate the size and activation volume of the shear transformation zone, which is otherwise difficult using only experimental data in the regime of negative strain rate sensitivity. (C) 2019 Elsevier B.V. All rights reserved.

引用

页码：488 / 499

页数：12

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