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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 6    December 2003

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Purification technology of AZ91 magnesium 
alloy wastes
WU Guo-hua(吴国华)1, XIE Min(谢 敏)2, ZHAI Chun-quan(翟春泉)1
ZENG Xiao-qin(曾小勤)1, ZHU Yan-ping(朱燕萍)1, DING Wen-jiang(丁文江)

1.State Key Laboratory of Metal Matrix Composites, 
 Shanghai Jiaotong University, Shanghai 200030, China;
 2.School of Adult Education, Shanghai Jiaotong University, Shanghai 200030, China

Abstract:The effects of different purification processes on the mechanical properties, structure and fracture pattern of AZ91 magnesium alloy wastes were studied. The results show that the inclusions in the Mg melt can be removed effectively by the treatment of the fluxes with MgO foam ceramic filter. Therefore, the properties of magnesium alloy wastes can be improved substantially. Tensile strength and elongation of the magnesium alloy wastes after purification treatment can reach 194.6MPa and 5.12% respectively, which are comparable to the mechanical properties of AZ91 fresh stuff. The metallographic analysis results show that the purification treatment has not obvious effect on metallurgical structure. The fracture mechanism of AZ91 is not changed, and its fractures are still quasi-cleavage crack. It is discovered that for AZ91 magnesium alloy, the fluxes containing TiO2 can decrease the Fe content of magnesium alloy wastes to below 0.0056%. The results also show that TiO2 is helpful for the precipitation of γ phase in granular or small island shape and can refine the grain size effectively.

 

Key words: magnesium alloy; purification; flux; structure; TiO2

ISSN 1672-7029
CN 43-1423/U

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