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On the activation energies observed in Al-based materials deformed at ultrahigh temperatures

Lou, B.Y., Wang, T.D., Huang, J.C. and Langdon, T.G. (2001) On the activation energies observed in Al-based materials deformed at ultrahigh temperatures In, Chandra, Namas (eds.) Superplasticity in Advanced Materials - ICSAM-2000. 2000 International Conference on Superplasticity in Advanced Materials (ICSAM-2000) Switzerland, Trans Tech pp. 545-550. (Materials Science Forum, 357-359).

Record type: Book Section

Abstract

This study examines the exceptionally high activation energies estimated fi om data obtained from various composites exhibiting high strain rate superplasticity and loaded at ultrahigh temperatures near or slightly above the solidus. It is shown that the activation energies for the 6061 composite and for Al 6061 and 1050 alloys are below 200 kJ/mol at temperatures lower than the incipient melting temperature, T-i, but they become significantly higher at temperatures near or slightly above T-i and this increase is independent of the alloy system, the grain size, whether the material is superplastic and the dominant deformation mechanism at T<T-i. There is a transition from plastic flow in a solid state to a viscous-like flow behavior in the Al-6061 systems at T>610 degreesC and in the Al-1050 alloy at T>650 degreesC. It is concluded that the high values of Q(t) have no physical meaning in terms of the rate-controlling diffusive species.

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More information

Published date: 2001
Additional Information: Series ISSN: 0255-5476
Venue - Dates: 2000 International Conference on Superplasticity in Advanced Materials (ICSAM-2000), 2000-08-01 - 2000-08-04

Identifiers

Local EPrints ID: 23454
URI: http://eprints.soton.ac.uk/id/eprint/23454
ISBN: 0878498745
ISSN: 0255-5476
PURE UUID: 07983b10-9623-4010-9da7-62a838b96fa7
ORCID for T.G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 23 Mar 2006
Last modified: 17 Jul 2017 16:17

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Contributors

Author: B.Y. Lou
Author: T.D. Wang
Author: J.C. Huang
Author: T.G. Langdon ORCID iD
Editor: Namas Chandra

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