A model of size effects in nano-indentation

被引：351

作者：

Huang, Y ^{[1
]}

Zhang, F

Hwang, KC

Nix, WD

Pharr, GM

Feng, G

机构：

[1] Univ Illinois, Dept Mech & Ind Engn, Urbana, IL 61801 USA

[2] Tsing Hua Univ, Dept Engn Mech, FML, Beijing 100084, Peoples R China

[3] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA

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

[5] Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA

来源：

JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS | 2006年 / 54卷 / 08期

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

nano-indentation hardness; maximum allowable density of geometrically necessary dislocations; Taylor dislocation model; indenter tip radius;

D O I：

10.1016/j.jmps.2006.02.002

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The indentation hardness-depth relation established by Nix and Gao [1998. Indentation size effects in crystalline materials: a law for strain gradient plasticity. J. Mech. Phys. Solids 46, 411-425] agrees well with the micro-indentation but not nano-indentation hardness data. We establish an analytic model for nano-indentation hardness based on the maximum allowable density of geometrically necessary dislocations. The model gives a simple relation between indentation hardness and depth, which degenerates to Nix and Gao [1998. Indentation size effects in crystalline materials: a law for strain gradient plasticity. J. Mech. Phys. Solids 46, 411-425] for micro-indentation. The model agrees well with both micro- and nano-indentation hardness data of MgO and iridium. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：1668 / 1686

页数：19

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