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Significance of microstructural thermal stability in an Al-2219 alloy processed by severe plastic deformation

Record type: Book Section

A commercial Al-2219 alloy was subjected to severe plastic deformation by processing through equal-channel angular pressing (ECAP) at room temperature. Ultrafine grains having an average size of about 0.2 ?m were present after totals of 8 and 12 passes through the ECAP die. Tensile testing of the as-pressed samples revealed no evidence for superplasticity at temperatures from 573 to 673 K. Careful microstructural examination showed that, although ?? or ? precipitates are present in the microstructure of the Al-2219 alloy, these precipitates are not sufficiently strong to prevent extensive grain growth at these elevated temperatures. It is concluded that thermal stability of the microstructure following severe plastic deformation is an important requirement in achieving superplastic ductilities at elevated temperatures.

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Citation

Han, B.Q. and Langdon, T.G. (2002) Significance of microstructural thermal stability in an Al-2219 alloy processed by severe plastic deformation In, Zhu, Y.T., Langdon, T.G., Mishra, R.S., Semiatin, S.L., Saran, M.J. and Lowe, T.C. (eds.) Ultrafine grained materials II. 2002 TMS Annual Meeting and Exhibition The Minerals, Metals & Materials Society pp. 485-494.

More information

Published date: 2002
Venue - Dates: 2002 TMS Annual Meeting and Exhibition, 2002-02-17 - 2002-02-21
Keywords: Al-2219 alloy, equal-channel angular pressing, tensile testing, thermal stability.

Identifiers

Local EPrints ID: 23859
URI: http://eprints.soton.ac.uk/id/eprint/23859
ISBN: 0-87339-523-9
PURE UUID: c78dd162-d026-4cb7-a144-7ce7627572de
ORCID for T.G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 31 Mar 2006
Last modified: 17 Jul 2017 16:16

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Contributors

Author: B.Q. Han
Author: T.G. Langdon ORCID iD
Editor: Y.T. Zhu
Editor: T.G. Langdon
Editor: R.S. Mishra
Editor: S.L. Semiatin
Editor: M.J. Saran
Editor: T.C. Lowe

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