Eutectic growth in Sr modified Al-13%Si alloy under unidirectional solidification

被引：3
作者：
Liao, H. C. [1 ,2 ]
Huang, W. R. [1 ,2 ]
Cai, M. D. [2 ,3 ]
机构：
[1] Southeast Univ, Jiangsu Key Lab Adv Metall Mat, Nanjing 211189, Peoples R China
[2] Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Peoples R China
[3] Exova Grp Ltd, Houston, TX 77040 USA
来源：
INTERNATIONAL JOURNAL OF CAST METALS RESEARCH | 2011年 / 24卷 / 02期
关键词：
Al-Si alloy; Unidirectional solidification; Eutectic growth; Microstructure; Temperature gradient; Growth velocity; AL-SI ALLOYS; MG CASTING ALLOYS; STRONTIUM; MICROSTRUCTURE; NUCLEATION; BORON;
D O I：
10.1179/1743133610Y.0000000008
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Al-Si castings have attracted tremendous research interest due to their wide application in the automobile industry. The effects of strontium addition, growth velocity and temperature gradient on eutectic growth in Al-13%Si alloy under unidirectional solidification condition are reported. Microstructural analysis revealed that the morphology of eutectic grains (such as plane front, cells and cellular/columnar and equiaxed dendrites) can be controlled by adjusting Sr addition, growth velocity and temperature gradient. Qualitatively, an increase in temperature gradient and/or reductions in growth velocity and Sr addition are beneficial for stabilising plane front eutectic growth. Experimental observations can be explained in the light of a constitutional supercooling criterion for stability of eutectic growth in polyphase alloy.
引用
收藏
页码：102 / 107
页数：6
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