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Using ECAP to achieve grain refinement, precipitate fragmentation and high strain rate superplasticity in a spray-cast aluminum alloy

Xu, Cheng, Furukawa, Minoru, Horita, Zenji and Langdon, Terence G. (2003) Using ECAP to achieve grain refinement, precipitate fragmentation and high strain rate superplasticity in a spray-cast aluminum alloy Acta Materialia, 51, (20), pp. 6139-6149. (doi:10.1016/S1359-6454(03)00433-6).

Record type: Article

Abstract

An aluminum 7034 alloy, produced by spray casting and with an initial grain size of ~2.1 ?m, was processed by equal-channel angular pressing (ECAP) at 473 K to produce an ultrafine grain size of ~0.3 ?m. It is shown that the rod-like MgZn2 precipitates present in the as-received alloy are broken into very small spherical particles during ECAP and these particles become distributed reasonably uniformly throughout the material. The presence of these fine MgZn2 particles, combined with a distribution of fine Al3Zr precipitates, is very effective in restricting grain growth so that submicrometer grains are retained at elevated temperatures up to at least ~670 K. Tensile testing of the pressed material revealed high elongations to failure, including elongations of >1000% when testing at a temperature of 673 K at initial strain rates at and above 10?2 s?1. These results confirm the occurrence of high strain rate superplasticity in the spray-cast alloy.

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More information

Published date: 2003
Keywords: aluminum alloys, equal-channel angular pressing, precipitate morphology, spray casting, superplasticity

Identifiers

Local EPrints ID: 23867
URI: http://eprints.soton.ac.uk/id/eprint/23867
ISSN: 1359-6454
PURE UUID: 300fe460-6c4b-4102-9597-2b8b4bbad1da
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 28 Mar 2006
Last modified: 17 Jul 2017 16:16

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Contributors

Author: Cheng Xu
Author: Minoru Furukawa
Author: Zenji Horita

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