Journal
ACTA MATERIALIA
Volume 50, Issue 3, Pages 553-564Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S1359-6454(01)00368-8
Keywords
aluminum alloys; equal-channel angular pressing; mechanical properties (high temperature)
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Experiments were conducted to evaluate the grain refinement introduced by equal-channel angular pressing (ECAP) in three different Al-3% Mg alloys containing either 0.2% Sc, 0.2% Zr or a combination of 0.2% Sc and 0.12% Zr. The results show all three alloys exhibit significant grain refinement with as-pressed grain sizes in the range of similar to0.20-0.3 mum. Tensile testing after ECAP revealed superplastic ductilities in the Al-Mg-Sc-Zr and Al-Mg-Sc alloys at strain rates in the vicinity of similar to10(-2) s(-1) at temperatures of 573 and 673 K but superplasticity was not achieved in the Al-Mg-Zr alloy due to the onset of rapid grain growth at 573 K. At the higher temperature of 773 K, the Al-Mg-Sc-Zr alloy exhibited exceptional superplastic ductilities but superplasticity was no longer achieved in the Al-Mg-Sc alloy. This difference was due to extensive grain growth in the Al-Mg-Sc alloy at temperatures in the vicinity of 773 K whereas the ultrafine-grained microstructure in the Al-Mg-Sc-Zr alloy was stable at this high temperature due to the presence of stable Al-3(ZrxSc1-x) precipitates. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
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