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

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-...

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Bibliographic Details
Published in:Acta materialia 2002-05, Vol.50 (9), p.2285-2296
Main Authors: Barnett, M.R., Montheillet, F.
Format: Article
Language:English
Subjects:
Aluminium
Applied sciences
Cross-disciplinary physics: materials science
rheology
Deformation structure
Exact sciences and technology
Hot working
Materials science
Metals. Metallurgy
Microstructure
Other heat and thermomechanical treatments
Physics
Torsion
Treatment of materials and its effects on microstructure and properties
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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.
ISSN:1359-6454
1873-2453
DOI:10.1016/S1359-6454(02)00048-4