Bilinear behavior in nano and microindentation tests of fcc polycrystalline materials

被引：16
|
作者：
Elmustafa, AA [1 ]
Ananda, AA
Elmahboub, WM
机构：
[1] Princeton Univ, Princeton Inst Sci & Technol Mat, Dept Mech & Aerosp Engn, Princeton, NJ 08544 USA
[2] NASA, Langley Res Ctr, ConITS, Hampton, VA 23665 USA
[3] Hampton Univ, Sch Sci, Dept Math, Hampton, VA 23668 USA
来源：
JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME | 2004年 / 126卷 / 04期
关键词：
indentation size effect; nanoindention; strain gradient plasticity; geometrically necessary dislocations; bilinear behavior;
D O I：
10.1115/1.1789962
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
alpha-brass and aluminum microhardness and deep nanoindentation data when fitted to the Taylor dislocation-hardening (TDH) model produced a straight-line behavior consistent with the model. Literature data, including copper silver and tungsten when also fitted to TDH model, exhibited results similar to the ones produced by the a-brass and aluminum data. The nanohardness data. obtained at shallower depths also exhibited straight-line behavior but with a shallower slope. Taken together the nano-microindentation data constituted what we term a "bilinear behavior " and we shall discuss possible mechanisms for this behavior.
引用
收藏
页码：353 / 359
页数：7
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