Granular deformation mechanisms in semi-solid alloys

Gourlay, C.M., Dahle, A. K., Nagira, T., Nakatsuka, N., Nogita, K., Uesugi, K. and Yasuda, H. (2011) Granular deformation mechanisms in semi-solid alloys. Acta Materialia, 59 12: 4933-4943. doi:10.1016/j.actamat.2011.04.038

Author Gourlay, C.M.
Dahle, A. K.
Nagira, T.
Nakatsuka, N.
Nogita, K.
Uesugi, K.
Yasuda, H.
Title Granular deformation mechanisms in semi-solid alloys
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
Publication date 2011-07-01
Sub-type Article (original research)
DOI 10.1016/j.actamat.2011.04.038
Open Access Status Not yet assessed
Volume 59
Issue 12
Start page 4933
End page 4943
Total pages 11
Place of publication Oxford, United Kingdom
Publisher Pergamon
Language eng
Subject 2504 Electronic, Optical and Magnetic Materials
2503 Ceramics and Composites
2507 Polymers and Plastics
2506 Metals and Alloys
Abstract Deformation mechanisms in equiaxed, partially solid Al–15 wt.% Cu are studied in situ by coupling shear-cell experiments with synchrotron X-ray radiography. Direct evidence is presented for granular deformation mechanisms in both globular and equiaxed-dendritic samples at solid fractions shortly after crystal impingement. It is demonstrated that dilatancy, arching and jamming occur at the crystal scale, and that these can cause stick–slip flow due to periodic dilation and compaction at low displacement rate. Granular deformation is found to be similar in globular and equiaxed-dendritic samples if length is scaled by the crystal size and packing is considered to occur among crystal envelopes. Rheological differences between the morphologies are discussed in terms of the competition between crystal rearrangement and crystal deformation.
Keyword Casting
Semi-solid processing
Deformation structure
Aluminium alloys
Synchrotron radiation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Chemistry and Molecular Biosciences
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