Creep and superplasticity in a spray-cast aluminum alloy processed by ECA pressing
Creep and superplasticity in a spray-cast aluminum alloy processed by ECA pressing
A commercial spray-cast aluminum 7034 alloy, having a composition of Al–11.5% Zn–2.5% Mg–0.9% Cu–0.2% Zr, was processed by equal-channel angular pressing (ECAP) at a temperature of 473 K to reduce the grain size from ~2.1 to ~0.3 ?m. Microstructural observations revealed a breaking of the rod-like MgZn2 precipitates during ECAP. Static annealing showed the ultrafine grain size was reasonably stable up to a temperature of 673 K. Tensile and creep tests were conducted using specimens cut from the unpressed bars and from billets processed by ECAP. In tensile testing at 673 K, the results on the as-pressed alloy show a potential for achieving high superplastic elongations to failure of >1000% at stain rates at and above 10?2 s?1. In creep testing at 473 K, the creep rates recorded for the as-pressed samples were significantly faster, by about two orders of magnitude, than for the unpressed alloy.
aluminum alloy, creep, equal-channel angular pressing, superplasticity, ultrafine grains
398-401
Xu, Cheng
af526865-aee4-4ef6-8174-def5c38149a2
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
2005
Xu, Cheng
af526865-aee4-4ef6-8174-def5c38149a2
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Xu, Cheng and Langdon, Terence G.
(2005)
Creep and superplasticity in a spray-cast aluminum alloy processed by ECA pressing.
Materials Science and Engineering: A, 410-411, .
(doi:10.1016/j.msea.2005.08.072).
Abstract
A commercial spray-cast aluminum 7034 alloy, having a composition of Al–11.5% Zn–2.5% Mg–0.9% Cu–0.2% Zr, was processed by equal-channel angular pressing (ECAP) at a temperature of 473 K to reduce the grain size from ~2.1 to ~0.3 ?m. Microstructural observations revealed a breaking of the rod-like MgZn2 precipitates during ECAP. Static annealing showed the ultrafine grain size was reasonably stable up to a temperature of 673 K. Tensile and creep tests were conducted using specimens cut from the unpressed bars and from billets processed by ECAP. In tensile testing at 673 K, the results on the as-pressed alloy show a potential for achieving high superplastic elongations to failure of >1000% at stain rates at and above 10?2 s?1. In creep testing at 473 K, the creep rates recorded for the as-pressed samples were significantly faster, by about two orders of magnitude, than for the unpressed alloy.
This record has no associated files available for download.
More information
Published date: 2005
Keywords:
aluminum alloy, creep, equal-channel angular pressing, superplasticity, ultrafine grains
Identifiers
Local EPrints ID: 23844
URI: http://eprints.soton.ac.uk/id/eprint/23844
PURE UUID: 7f4851e1-5b81-4280-a55e-be42346a575e
Catalogue record
Date deposited: 20 Mar 2006
Last modified: 16 Mar 2024 03:28
Export record
Altmetrics
Contributors
Author:
Cheng Xu
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics