Journal
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
Volume 31, Issue 3, Pages 624-629Publisher
JOURNAL WUHAN UNIV TECHNOLOGY
DOI: 10.1007/s11595-016-1420-x
Keywords
rare earth; aluminum alloys; microstructure; mechanical properties
Categories
Funding
- National Natural Science Foundation of China [51364035, 51405216]
- Ministry of Education [20133601110001]
- Training Program Foundation for Young Scientist of Jiangxi [20153BCB23023]
- Natural Science Foundation of Jiangxi Province [20151BAB216018]
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The purpose of this study is to investigate the influence of samarium addition on the microstructures and mechanical properties of Al-5Cu alloys. The microstructures were examined by optical microscopy, X-ray diffraction, scanning electron microscopy, energy diffraction spectroscopy and differential thermal analysis. It was found that Sm was capable significantly of affecting the microstructures of Al-5Cu alloys. When 0.4 wt% Sm was added into the alloy, the aspect ratio and the mean area of Al2Cu phase were 10.9 and 61.0 mu m(2). They were decreased by 31.5% and 43.3% when compared with unmodified alloy. Meanwhile, a kind of nano size strengthening Al2Sm phase was formed in Al-5Cu alloys. In addition, the differential thermal analysis results showed that Sm addition results in a decrease in the melting temperature of alpha-Al and Al2Cu. And a good combination of yield strength (244.5 MPa), ultimate tensile strength (269.4 MPa) and elongation (6.9%) was obtained when the Sm addition was 0.4 wt%. Compared with unmodified Al-5Cu alloys, they were increased by 37.6%, 35.2% and 21.1%, respectively.
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