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 |
| Item ID: | 23867 |
| Date Deposited: | 28 Mar 2006 |
| Last Modified: | 02 Mar 2012 13:05 |
| Contributors: | Xu, Cheng (Author) Furukawa, Minoru (Author) Horita, Zenji (Author) Langdon, Terence G. (Author) |
| Date: | 2003 |
| Status: | Published |
| Contact Email Address: | langdon@usc.edu |
| URI: | http://eprints.soton.ac.uk/id/eprint/23867 |
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