Effects of Rare Earth and Ca Elements Additions on the Microstructure and Tensile Properties of Mg-6Zn-3Al-1Cu Alloys

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Abstract:

In this paper, the effects of rare earth (RE) and Calcium (Ca) element additions on the microstructure and tensile properties of Mg-6Zn-3Al-1Cu alloy were studied, respectively. The results show that the alloy has MgZn phase and Mg17Al12 phase in matrix α-(Mg) and Mg32 (Al, Zn, Cu)49 phase along grain boundaries. The Ca and RE element additions lead to the formation of a Ca-containing inter-metallic and Al11RE3 phases, respectively. The simultaneous addition of 0.5 wt% RE and 0.5 wt% Ca can result in the optimal tensile properties at both room temperature and 150 C with acceptable elongation. However, the addition of 1.0 wt% Ca causes the deterioration of the tensile properties due to the formation of a large amount of thin and crisp Ca-containing inter-metallic particles along the grain boundaries.

Keywords: MAGNESIUM ALLOY; MG-ZN-AL-CU ALLOY; MICROSTRUCTURE; RARE EARTH; TENSILE PROPERTIES

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/asl.2011.1896

Publication date: November 1, 2011

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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