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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Modification of primary Mg2Si in Mg-5Si alloys with Y2O3
ZHENG Na(郑 娜), WANG Hui-yuan(王慧远), ZHAO Feng(赵 峰),
 GU Zhen-hua(顾振华), LI Dong(李 栋), JIANG Qi-chuan(姜启川)

Key Laboratory of Automobile Materials of Ministry of Education,
Department of Materials Science and Engineering, Jilin University, Changchun 130025, China

Abstract:The Y2O3 addition to Mg-5Si alloys has a good modification effect on the primary Mg2Si. With 0.05% or 0.1% (mass fraction) Y2O3 additions, the primary Mg2Si begins to change from coarse dendritic shape (about 100 mm) into small polyhedral shape and therefore the alloys exhibits sub-modified microstructure. With 0.2% Y2O3 addition, most of the primary Mg2Si becomes polyhedral shape and its average size is only 25 mm or less. The Mg-5Si alloy exhibits modified microstructure. In addition, the experiments show that the reaction between Mg and Y2O3 cannot occur in the sintered Mg-6Y2O3 compact; however, the reaction among Mg, Si and Y2O3 can occur in the sintered Mg-5Si-6Y2O3 compact. Apart from the adsorption and poisoning manners, other mechanisms may exist in the modification of Y2O3 addition on the primary Mg2Si.

 

Key words: microstructure; solidification; Mg2Si; Y2O3; Mg-5Si alloy

ISSN 1672-7029
CN 43-1423/U

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