Significance of microstructural thermal stability in an Al-2219 alloy processed by severe plastic deformation
Significance of microstructural thermal stability in an Al-2219 alloy processed by severe plastic deformation
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.
Al-2219 alloy, equal-channel angular pressing, tensile testing, thermal stability.
0-87339-523-9
485-494
The Minerals, Metals & Materials Society
Han, B.Q.
d3e21c68-c024-44a8-8a89-834427815460
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
2002
Han, B.Q.
d3e21c68-c024-44a8-8a89-834427815460
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
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 (17/02/02 - 21/02/02)
The Minerals, Metals & Materials Society, .
Record type:
Book Section
Abstract
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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More information
Published date: 2002
Venue - Dates:
2002 TMS Annual Meeting and Exhibition, Seattle, Washington, 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
Catalogue record
Date deposited: 31 Mar 2006
Last modified: 31 Jan 2024 02:38
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Contributors
Author:
B.Q. Han
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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