Dynamic characterization of Portevin-Le Chatelier instabilities occurring in depth-sensing microhardness tests

被引：7

作者：

Bérces, G ^{[1
]}

Lendvai, J ^{[1
]}

Juhász, A ^{[1
]}

Chinh, NQ ^{[1
]}

机构：

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

来源：

JOURNAL OF MATERIALS RESEARCH | 2003年 / 18卷 / 12期

关键词：

D O I：

10.1557/JMR.2003.0401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Characteristic properties of plastic instabilities were studied using depth-sensing microhardness experiments on an Al-3.3 wt.% Mg alloy and computer simulations based on a macroscopic dynamic model of the experimental setup. A stepwise increase was observed in the indentation depth versus load (d-F) curves measured in constant loading rate mode, indicating hardness oscillations around a nearly constant value of the conventional dynamic microhardness. These oscillations were correlated with plastic instabilities starting from the contact surface between the sample and the indenter head. Taking into account the experimentally determined connection between the hardness oscillations and the indentation velocity, a dynamic model was proposed for the characterization of instability steps.

引用

页码：2874 / 2881

页数：8

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