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《Ordnance Material Science and Engineering》 2007-02
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Research and analysis on microstructure of Mg-Sr and Mg-Al-Sr alloys

CHEN Gang1, FAN Pei-geng1,CAO Peng-jun1,CAI Gei1,PENG Xiao-dong2 (1.College of Metallurgy and Materials, Chongqing University of Science and Technology,Chongqing 400050,China; 2.College of Mechanical Engineering, Chongqing University, Chongqing 400044, China)  
The modification of Mg-Sr alloy and the creep resistance properties of Mg-Al-Sr alloy were closely related to their structures. Magnesium-strontium master alloys and magnesium-aluminum- strontium were prepared by mixing method in this paper. The characteristics, mainly including phase composition and microstructure, were investigated by optical microscope (OM), scanning electron microscope (SEM), X-ray diffraction (XRD). The results were following: the microstructure of hypoeutectic Mg-Sr binary alloys was composed of primaryа-Mg matrix, and sluglike, needle-shaped eutectic phase; while the microstructure of hypoeutectic Mg-Al-Sr ternary alloys was composed of small dendrite primary а-Mg matrix, and sluglike eutectic phases, mainly including а-Mg, eutectic composite(Mg17Sr2、Mg12Al17、Al4Sr and Mg-Al-Sr ternary composite), its microstructure and eutectic composition depend on the value of Sr/Al.
【Fund】: 国家863计划项目(No.2003AA32X050)
【CateGory Index】: TG115.2
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