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
收藏
页码:100 / 107
页数:8
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