Kinematic and dynamic characterization of plastic instabilities occurring in nano- and microindentation tests

被引：10

作者：

Chinh, NQ ^{[1
]}

Horváth, G ^{[1
]}

Kovács, Z ^{[1
]}

Juhász, A ^{[1
]}

Bérces, G ^{[1
]}

Lendvai, J ^{[1
]}

机构：

[1] Eotvos Lorand Univ, Dept Gen Phys, H-1117 Budapest, Hungary

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2005年 / 409卷 / 1-2期

基金：

匈牙利科学研究基金会;

关键词：

plastic instabilities; serrated indentation; hardness oscillation; solute concentration; grain size; dynamic model;

D O I：

10.1016/j.msea.2005.04.057

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This paper surveys the phenomenon of plastic instabilities occurring in depth sensing indentation measurements, during which a stepwise increase has been observed in the indentation depth-load (F-h) curves measured in constant loading rate mode. In these measurements, plastic instability - serrated indentation - manifests itself as hardness oscillations around a nearly constant value of the conventional dynamic microhardness. Investigations presented here are focused on both kinematic and dynamic characterization of Portevin-Le Chatelier type indentation instabilities. The effect of important factors such as solute concentration and polycrystalline grain size is described and discussed. Taking into account the experimental observations, a macro-mechanical dynamic model was also proposed for the characterization of indentation instabilities. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：100 / 107

页数：8

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