The effect of coarse second-phase particles and fine precipitates on microstructure refinement and mechanical properties of severely deformed Al alloy

The sub-micrometer microstructure developed during severe plastic deformation by equal channel angular pressing in an Al alloy containing a small amount of dispersed intermetallic particles has been examined in material in a variety of solutionised and precipitated states. Microstructural refinement...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2005-03, Vol.394 (1), p.399-410
Main Authors: Gutierrez-Urrutia, I., Muñoz-Morris, M.A., Morris, D.G.
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Grain boundary misorientation
Materials science
Other heat and thermomechanical treatments
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Precipitation
Second-phase particles
Severe plastic deformation
Strengthening
Sub-micrometer grains
Treatment of materials and its effects on microstructure and properties
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Summary:The sub-micrometer microstructure developed during severe plastic deformation by equal channel angular pressing in an Al alloy containing a small amount of dispersed intermetallic particles has been examined in material in a variety of solutionised and precipitated states. Microstructural refinement, and corresponding strengthening, occurs faster in these particle-containing materials than in particle-free equivalents. Coarse precipitate and dispersoid particles remain mostly unaffected by the severe deformation, and appear to help stabilise a finer deformation microstructure, while fine precipitates are sheared and apparently dissolved. The extent of microstructural refinement and strengthening depends more on solute content than on particle distributions. The limited effect of dispersoid and precipitate particles may be due, in part, to their presence in only small volume fractions, less than 1% by volume each. Strengthening depends more on dislocation arrangements and densities than on the number of boundaries present.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2004.11.025