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), 6139-6149. (doi:10.1016/S1359-6454(03)00433-6).

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Description/Abstract

An aluminum 7034 alloy, produced by spray casting and with an initial grain size of ~2.1 μm, was processed by equal-channel angular pressing (ECAP) at 473 K to produce an ultrafine grain size of ~0.3 μm. 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.

Item Type: Article
ISSNs: 1359-6454 (print)
Related URLs:
Keywords: aluminum alloys, equal-channel angular pressing, precipitate morphology, spray casting, superplasticity
Subjects: T Technology > TJ Mechanical engineering and machinery
Q Science > QD Chemistry
Q Science > QC Physics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 23867
Date Deposited: 28 Mar 2006
Last Modified: 27 Mar 2014 18:13
Contact Email Address: langdon@usc.edu
URI: http://eprints.soton.ac.uk/id/eprint/23867

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