The effect of precipitation on the Portevin-Le Chatelier effect in an Al-Zn-Mg-Cu alloy

被引：111

作者：

Thevenet, D ^{[1
]}

Mliha-Touati, M ^{[1
]}

Zeghloul, A ^{[1
]}

机构：

[1] Univ Metz, Mecan & Phys Mat Lab, CNRS, UMR 7554, F-57045 Metz 01, France

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1999年 / 266卷 / 1-2期

关键词：

Portevin-Le Chatelier effect; plastic deformation; instability; experimental study; precipitation; ageing; aluminium-zinc-magnesium alloys;

D O I：

10.1016/S0921-5093(99)00029-5

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The effect of ageing times and temperatures up to 200 degrees C on the characteristics of serrated flow in an Al-Zn-Mg-Cu alloy was investigated. Tests at room temperature were conducted on a hard tensile machine. Experimental measurements of the serrated yielding show the important influence of precipitation. In particular, Guinier-Preston (GP) zones reduce the tendency to serrated flow and increase the onset strain of serrations, epsilon(c). Precipitates formed at high ageing temperatures favour the occurrence of serrated flow. However, the epsilon(c) values remain higher than those observed for materials aged at very low temperature. The influence of precipitation of the magnitude of the stress drop has also been examined. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：175 / 182

页数：8

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