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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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.
|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
|Date Deposited:||28 Mar 2006|
|Last Modified:||27 Mar 2014 18:13|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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