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The generation of new high-angle boundaries in aluminium during hot torsion

Barnett, Matthew and Montheillet, F. 2002, The generation of new high-angle boundaries in aluminium during hot torsion, Acta materialia, vol. 50, no. 9, pp. 2285-2296.

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Title The generation of new high-angle boundaries in aluminium during hot torsion
Author(s) Barnett, Matthew
Montheillet, F.
Journal name Acta materialia
Volume number 50
Issue number 9
Start page 2285
End page 2296
Publisher Elsevier Science
Place of publication New York, N.Y.
Publication date 2002
ISSN 1359-6454
Keyword(s) aluminium
hot working
torsion
microstructure
deformation structure
Summary The crystallographic rotation field for deformation in torsion is such that it is possible for orientations close to stable orientations to rotate away from the stable orientation. A Taylor type model was used to demonstrate that this phenomenon has the potential to transform randomly generated low-angle boundaries into high-angle boundaries. After imposing an equivalent strain of 1.2, up to 40% of the simulated boundaries displayed a disorientation in excess of 15°. These high-angle boundaries were characterised by a disorientation axis close to parallel with the sample radial direction. A series of hot torsion tests was carried out on 1050 aluminium to seek evidence for boundaries formed by this mechanism. A number of deformation-induced high-angle boundaries were identified. Many of these boundaries showed disorientation axes and rotation senses similar to those seen in the simulations. Between 10% and 25% of all the high-angle boundary present in samples twisted to equivalent strains between 2 and 7 could be attributed to the present mechanism.
Language eng
Field of Research 091207 Metals and Alloy Materials
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2002, Elsevier Science
Persistent URL http://hdl.handle.net/10536/DRO/DU:30001776

Document type: Journal Article
Collection: School of Engineering and Technology
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