The effect of dispersoids on the grain refinement mechanisms during deformation of aluminium alloys to ultra-high strains
- Manchester Materials Science Centre, University of Manchester/UMIST, Grosvenor Street, Manchester M1 7HS (United Kingdom)
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 Al{sub 3}Sc dispersoids, of {approx}20 nm in diameter and {approx}100 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, non-shearable, 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.
- OSTI ID:
- 20637130
- Journal Information:
- Acta Materialia, Vol. 53, Issue 2; Other Information: DOI: 10.1016/j.actamat.2004.09.042; PII: S1359-6454(04)00599-3; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 1359-6454
- Country of Publication:
- United States
- Language:
- English
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