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

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

Document Type: Research Article

Publication date: 2011-11-01

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