Influence of deformation variables on the formation of copper-type shear bands in Al-lMg

被引：89

作者：

Duckham, A

Knutsen, RD

Engler, O

机构：

[1] Univ Cape Town, Ctr Mat Engn, ZA-7701 Rondebosch, South Africa

[2] Los Alamos Natl Lab, Mat Sci & Technol Div MST 8, Los Alamos, NM 87545 USA

来源：

ACTA MATERIALIA | 2001年 / 49卷 / 14期

基金：

新加坡国家研究基金会;

关键词：

shear bands; texture; aluminium; hot deformation;

D O I：

10.1016/S1359-6454(01)00166-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The formation of copper-type or grain-scale shear bands in Al-lMg during plane strain compression (PSC) is described as a function of strain, strain rate and deformation temperature. Shear banding is observed to decrease dramatically in strength over a small range of the Zener-Hollomon parameter (Z) at Z approximately equal to 1.0x10(11) s(-1). This sharp transition in shear band formation is seen to correlate exactly with a sharp increase in dynamic recovery during deformation, as inferred from flow stress measurements, hardness measurements and microstructural analysis of as-deformed specimens. The observed correlation of shear band formation and dynamic recovery during deformation provides further insight into the basic mechanisms of shear band formation. The influence of shear bands on deformation texture is also investigated and is seen to affect the relative intensities of, and precise position along, the beta -fibre. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：2739 / 2749

页数：11

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