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Microstructure of severely deformed Al–3Mg and its evolution during annealing

Authors :
Mª Antonia Muñoz-Morris
David G. Morris
Source :
Digital.CSIC. Repositorio Institucional del CSIC, instname
Publication Year :
2002
Publisher :
Elsevier BV, 2002.

Abstract

The submicron microstructure developed here after heavy deformation of Al-3Mg by equal channel angular pressing (ECAP) is shown to consist of an elongated grain and cell structure of width 70-80 nm and 300-400 nm length. There is also a high dislocation density inside these grains with some tendency to dislocation arrangement as a cell structure. Many of the grain boundaries are shown to be of low-medium angle and are not the randomly misoriented, high-angle boundaries generally assumed to be present. Annealing at low temperatures leads to a reduction of dislocation density, some reduction of grain length as transverse boundaries form in the elongated grains, and grain coarsening. At higher temperatures a duplex structure forms as some regions show localized recrystallization. The relationship of grain boundary misorientation and high-temperature coarsening and recrystallization to the applied heavy strain and alloy composition is discussed. © 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

Details

ISSN :
13596454
Volume :
50
Database :
OpenAIRE
Journal :
Acta Materialia
Accession number :
edsair.doi.dedup.....dc19a525ad4fa324ccfa94a6bb239ebb
Full Text :
https://doi.org/10.1016/s1359-6454(02)00203-3