Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 527, Issue 16-17, Pages 4191-4196Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2010.03.065
Keywords
Superplasticity; Aluminum alloy; Friction stir processing; Grain growth
Categories
Funding
- National Natural Science Foundation of China [50671103, 50871111]
- National Basic Research Program of China [2006CB605205]
- National Outstanding Young Scientist Foundation [50525103]
- Chinese Academy of Sciences
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Commercial 2219Al-T6 alloy plates were friction stir processed (FSPed) at a rotation rate of 400 rpm and a traverse speed of 100 mm/mm n in water and air, producing two fine-grained 2219Al samples with average grain sizes of 1.0 and 2.1 mu m, respectively. The 1.0 and 2.1 mu m-2219Al retained fine-grained microstructure during annealing treatment at temperatures up to 400 and 425 degrees C, respectively, above which abnormal grain growth occurred. Superplasticity was observed in 1.0 mu m-2219Al within the medium temperature range of 350-425 degrees C and a maximum ductility of 450% was obtained at 400 degrees C and 3 x 10(-4) s(-1). Increasing the grain size from 1.0 to 2.1 mu m resulted in a slight increase in the thermal stability, but did not enhance the superplasticity of the FSP 2219Al. The relatively low superplasticity in the FSP fine-grained 2219Al was attributed to unstable grain structure because the pining Al2Cu particles were easily coarsened at high temperatures. (C) 2010 Elsevier B.V. All rights reserved.
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