The effect of dispersoids on the grain refinement mechanisms during deformation of aluminium alloys to ultra-high strains

被引：168

作者：

Apps, PJ ^{[1
]}

Berta, M ^{[1
]}

Prangnell, PB ^{[1
]}

机构：

[1] Univ Manchester, Inst Sci & Technol, Ctr Mat Sci, Manchester M1 7HS, Lancs, England

来源：

ACTA MATERIALIA | 2005年 / 53卷 / 02期

基金：

英国工程与自然科学研究理事会;

关键词：

severe deformation; ultra-fine grains; grain subdivision; microshear bands; fine particles; dispersoids; Al3SC;

D O I：

10.1016/j.actamat.2004.09.042

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of fine dispersoids on the mechanisms and rate of grain refinement has been investigated during the severe deformation of a model aluminium alloy. A binary Al-0.2Sc alloy, containing coherent Al3Sc dispersoids, of similar to20 nm in diameter and similar to100 nm spacing, has been deformed by equal channel angular extrusion to an effective strain of ten. The resulting deformation structures were quantitatively analysed using high-resolution electron backscattered diffraction orientation mapping, and the results have been compared to those obtained from a single-phase Al-0.13Mg alloy, deformed under identical conditions. The presence of fine, nonshearable, dispersoids has been found to homogenise slip, retard the formation of a cellular substructure and inhibit the formation of microshear bands during deformation. These factors combine to reduce the rate of high-angle grain boundary generation at low to medium strains and, hence, retard the formation of a submicron grain structure to higher strains during severe deformation. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：499 / 511

页数：13

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