Indentation size effects in the nano- and micro-hardness of fcc single crystal metals

被引：101

作者：

Zong, Z. ^{[1
]}

Lou, J.

Adewoye, O. O.

Elmustafa, A. A.

Hammad, F.

Soboyejo, W. O.

机构：

[1] Princeton Univ, PRISM, Dept Mech & Aerosp Engn, Princeton, NJ 08544 USA

[2] Rice Univ, Dept Mech Engn & Mat Sci, Houston, TX 77251 USA

[3] Old Dominion Univ, Dept Mech Engn, Norfolk, VA 23529 USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2006年 / 434卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

nano- and micro-indentation; indentation size effects; Bi-linear behavior; strain gradient plasticity; statistically stored dislocations (SSD); geometrically necessary dislocations (GND);

D O I：

10.1016/j.msea.2006.06.137

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This paper presents the results of the experimental study of nano- and micro-indentation size effect on selected (0 0 1) oriented face-centered cubic (fcc) crystals (Ni, Au and Ag). Following a detailed description of experimental techniques and correction factors, indentation size effects in (0 0 1) oriented An, Ag and Ni single crystals are elucidated. Material pile-up phenomena are discussed before analyzing the results within the context of mechanism-based strain gradient plasticity (SGP) theories. Microstructure length scales are calculated based on the analysis. These are shown to vary with indentation size. A bi-linear behavior is shown to describe the indentation size effects between the micro- and nano-scales. This is rationalized by considering the limiting cases of plastic deformation by source-limited and established dislocation substructures. A multi-scale framework is proposed for modeling small contacts. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：178 / 187

页数：10

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