Journal
SCRIPTA MATERIALIA
Volume 62, Issue 3, Pages 125-128Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2009.10.010
Keywords
Superplasticity; Friction stir processing; Ultrafine-grained structure; Aluminum alloys; Friction stir welding
Categories
Funding
- National Natural Science Foundation of China [50671103, 50871111, 50890171]
- National Basic Research Program of China [2006CB605205]
- National Outstanding Young Scientist Foundation [50525103]
- Chinese Academy of Sciences
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Ultrafine-grained (0.6 mu m) Al-Mg-Sc alloy with predominant high-angle boundaries was produced by friction stir processing. A superplastic elongation of 210% was obtained at 175 degrees C, and the optimum strain rate and maximum elongation increased with increasing temperature. Marker lines were scratched on the polished specimen surfaces using a nano-indenter to measure grain boundary sliding (GBS) offsets during deformation, which indicated that the GBS contribution to the strain exceeded 50% at 175 degrees C and increased with increases in strain and temperature. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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