Modification of primary Mg2Si in Mg-5Si alloys with Y2O3

摘要：

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 μm) 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 μm 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.

关键词： microstructure solidification Mg2Si Y2O3 Mg-5Si alloy

作者: ZHENG Na WANG Hui-yuan ZHAO Feng GU Zhen-hua LI Dong JIANG Qi-chuan

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

会议类型: 国际会议

会议名称: 2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)

会议地点: 长沙

会议语种:英文

在线出版日期: 2007-11-28（万方平台首次上网日期，不代表论文的发表时间）