Journal
INTERMETALLICS
Volume 28, Issue -, Pages 71-76Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2012.03.050
Keywords
Rare-earth intermetallics; Precipitates; Heat treatment; Grain-boundary character distribution; Mechanical properties
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Funding
- Specialized Research Fund for the Doctoral Program of Higher Education of China [200802941010, 20100006110013]
- Fundamental Research Funds for the Central Universities of China [FRF-TP-09-026B, 2009815514]
- Research Project of University of Science and Technology (USTB) [2011Z-13]
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By using titanium hydride as the blowing agent and Ca particles as the thickening agent, the cellular Al-0.24wt.%Sc and Al-0.41wt.%Sc foams with a porosity ranging from 48 to 86% were successfully fabricated via the melt-foaming method. The compressive behaviors and effects of minor Sc additions on the strengthening mechanism of the cellular Al-Sc alloy foams were investigated and discussed. The results show that minor Sc additions can dramatically improve the compressive strength of the cellular Al foams due to the grain refinement and pinning effect from the Al3Sc precipitates homogeneously distributed in the matrix after heat treatment, implying that the Sc addition coupled with proper heat treatment is an effective way to improve the mechanical performance for Al-based alloy foams. (C) 2012 Elsevier Ltd. All rights reserved.
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