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《The Chinese Journal of Nonferrous Metals》 2009-05
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Microstructure and high temperature mechanical properties of Mg-5Al-0.8Ca-0.2La-xSr alloy

WANG She-bin1, 2, 3, LI Xiao-bin1, FAN Jing-ping1, WANG Shuai1, XU Bing-she1, 2, 3 (1.College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; 2. Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China; 3. Center of Materials Research and Development of TYUT-Foxcon, Taiyuan University of Technology, Taiyuan 030024, China)  
The Mg-5Al-0.8Ca-0.2La-xSr alloys with different Sr contents were melted, refined and non-oxygen-cast under vacuum environment. The effects of addition of Sr on the microstructures and mechanical properties at both room and elevated temperature of 150?200 ℃ for the magnesium alloys were investigated. The results show that the base alloy is composed of Al2Ca and Al11La3 phases, which looks like bones and stripes and small points, respectively, and a small quantity of β-Mg17Al12 phase except α-Mg phase. With addition of Sr, the base alloy is refined remarkably, β-Mg17Al12 phase is restrained, a new heat-resistant phase (Mg-Al-Sr) forms at the grain boundary, which improves the high temperature mechanical properties of alloy. With increasing mass fraction of Sr, the tensile strength and elongation at room temperature decrease. Whereas the tensile strength and yield strength at elevated temperature are improved remarkably. When the mass fraction of Sr is 0.5%, the alloy has the best general mechanical properties.
【Fund】: 国家自然科学基金资助项目(20271037;20471041);; 国家自然科学基金国际合作资助项目(50311140138)
【CateGory Index】: TG146.22
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