Low-cycle fatigue of metallic glass nanowires

被引：40

作者：

Luo, Jian ^{[1
]}

Dahmen, Karin ^{[2
]}

Liaw, Peter K. ^{[3
]}

Shi, Yunfeng ^{[1
]}

机构：

[1] Rensselaer Polytech Inst, Dept Mat Sci & Engn, Troy, NY 12180 USA

[2] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[3] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

来源：

ACTA MATERIALIA | 2015年 / 87卷

基金：

美国国家科学基金会;

关键词：

Metallic glasses; Nanowires; Low-cycle fatigue; Fracture; Work hardening; PLASTIC STRAIN AMPLITUDE; SIMPLE MONATOMIC LIQUID; MOLECULAR-DYNAMICS; POLYCRYSTALLINE COPPER; STRUCTURAL ANISOTROPY; TENSILE DUCTILITY; DAMAGE; RANGE; LIMIT; TEMPERATURE;

D O I：

10.1016/j.actamat.2014.12.038

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Low-cycle fatigue fracture of metallic glass nanowires was investigated using molecular dynamics simulations. The nanowires exhibit work hardening or softening, depending on the applied load. The structural origin of the hardening/softening response was identified as the decrease/increase of the tetrahedral clusters, as a result of the non-hardsphere nature of the glass model. The fatigue fracture is caused by shear banding initiated from the surface. The plastic-strain-controlled fatigue tests show that the fatigue life follows the Coffin-Manson relation. Such power-law form originates from plastic-strain-dependent microscopic damage accumulation. Lastly, the effect of a notch on low-cycle fatigue of nanowires in terms of failure mode and fatigue life was also discussed. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：225 / 232

页数：8

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