Nanostructures generated by explosively driven friction: Experiments and molecular dynamics simulations

被引：37

作者：

Kim, H-J. ^{[1
]}

Emge, A. ^{[1
]}

Winter, R. E. ^{[2
]}

Keightley, P. T. ^{[2
]}

Kim, W. -K. ^{[3
]}

Falk, M. L. ^{[4
]}

Rigney, D. A. ^{[1
]}

机构：

[1] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43210 USA

[2] Aldermaston, Atom Weap Estab, Reading, Berks, England

[3] Univ Michigan, Dept Mech Engn, Ann Arbor, MI 48109 USA

[4] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA

来源：

ACTA MATERIALIA | 2009年 / 57卷 / 17期

基金：

美国国家科学基金会;

关键词：

Tribology; Nanostructure; High-speed deformation; Severe plastic deformation (SPD); Molecular dynamics simulations (MD simulations); SEVERE PLASTIC-DEFORMATION; ULTRAFINE-GRAINED MATERIALS; NANOCRYSTALLINE FERRITE; ALUMINUM; BEHAVIOR; COPPER; MG; TEMPERATURE; MECHANISM; ADDITIONS;

D O I：

10.1016/j.actamat.2009.07.034

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Dynamic friction experiments between aluminum and steel were conducted using an explosively driven tribotester, which allows friction testing with high velocity and high pressure within a very short time. Characterization of the sliding surfaces showed material transfer, severe plastic deformation of the softer material, evidence of high strain and strain rate, and nanostructure formation at the surface and subsurface. Such friction-induced phenomena have frequently been reported. However experimental results obtained in a few microseconds are rarely described. In particular, formation of a thin (similar to 1 mu m) and uniform nanostructure within such a short time suggests that a new mechanism is needed to explain the nanostructure formation. Molecular dynamics simulations of the sliding of hard/soft crystals reveal nanometer size vorticity at the sliding interface. This results in atomic-scale flow and mixing that contribute to a disordered and nanostructured surface layer, as observed in experiments. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：5270 / 5282

页数：13

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