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Superplastic flow in a nanostructured aluminum alloy produced using high-pressure torsion
Samples of a spray-cast Al-7034 alloy were processed by high-pressure torsion (HPT) at temperatures of 293 or 473 K using an imposed pressure of 4 GPa and torsional straining through five revolutions. Processing by HPT produced significant grain refinement with grain sizes of ∼60 and ∼85 nm at the e...
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Published in: | Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2009-01, Vol.500 (1), p.170-175 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Samples of a spray-cast Al-7034 alloy were processed by high-pressure torsion (HPT) at temperatures of 293 or 473
K using an imposed pressure of 4
GPa and torsional straining through five revolutions. Processing by HPT produced significant grain refinement with grain sizes of ∼60 and ∼85
nm at the edges of the disks for the two processing temperatures. In tensile testing at room temperature, the alloy processed by HPT exhibited higher strength and lower ductility than the unprocessed material. Good superplastic properties were achieved in tensile testing at elevated temperatures with a maximum elongation of 750% for the sample processed at 473
K and tested in tension at 703
K under an initial strain rate of 1.0
×
10
−2
s
−1. The measured superplastic elongations are lower than in samples prepared by equal-channel angular pressing because of the use of very thin disks in the HPT processing. |
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ISSN: | 0921-5093 1873-4936 |
DOI: | 10.1016/j.msea.2008.09.049 |