Effect of phosphorus on microstructure and growth manner of primary Mg2Si crystal in Mg2Si/Al composite

被引：158
作者：
Qin, Q. D.
Zhao, Y. G.
Zhou, W.
Cong, P. J.
机构：
[1] Jilin Univ, Key Lab Automobile Mat, Minist Educ, Changchun 130025, Peoples R China
[2] Jilin Univ, Dept Mat Sci & Engn, Changchun 130025, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2007年 / 447卷 / 1-2期
关键词：
Mg2Si/Al composite; microstructure; modification; phosphorous; crystal growth;
D O I：
10.1016/j.msea.2006.10.076
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effects of phosphorus on primary, eutectic Mg2Si phases and growth manner of Mg2Si crystal in Mg2Si/Al composite with steel die and sand mould cast are investigated. The results show that, with the addition of phosphor-us, the morphologies of primary Mg2Si particulates changed from dendritic or equiaxed to polygonal shape, and their sizes decrease from similar to 300 mu m and 200 mu m to similar to 20 mu m and similar to 50 mu m, respectively. Furthermore, the morphologies of eutectic Mg2Si phases change from fibriform to short fibriform and/or dot-like, while the eutectic Si phases do not change obviously. The exact morphologies Of Mg2Si crystals are identified as tetrakaidecahedron and/or octahedron after modification with P, due to V-[100] is depressed. Also, growth mechanism and the formation of hopper-like crystal are discussed. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：186 / 191
页数：6
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