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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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Modification mechanism of hypereutectic Al-Si alloy with P-Na addition
WU Shu-sen(吴树森)1, TU Xiao-lin(涂小林)1, Y. Fukuda(福田葉椰)2
T. Kanno(菅野利猛)2, H. Nakae(中江秀雄)3

1. State Key Laboratory of Mould and Dies Technology,
Huazhong University of Science and Technology,Wuhan 430074,China;
2. Kimura Foundry Co Ltd, Shizuoka 411, Japan;
3. Department of Materials Science and Engineering, 
Waseda University, Tokyo 169, Japan

Abstract:Effect of P-Na united modification on Al-22%Si-1.0%Cu-0.5%Mg-0.5%Mn alloy was studied. The results show that the refining effect of P-Na addition on primary silicon is superior to that of P and the former could modify eutectic silicon at the same time. Effects of P-Na modification on crystallization and microstructure of hypereutectic Al-Si alloys were studied with Electron-Scanning Microscope, Electron-Probe and X-ray diffractometer. The modification mechanism represents that on one hand, the primary silicon is refined by AlP as heterogeneous nucleus; on the other hand, when Na is added at the same time, P atoms are difficult to diffuse in the melt, and then enrichs on the growing faces of silicon phase. Moreover, a SiP compound was also discovered in Si crystals, which prevents the growth of silicon phase and refines the primary silicon.
附件:yw2003-06-07

 

Key words: hypereutectic Al-Si alloys; modification mechanism; grain refinement; modification

ISSN 1672-7029
CN 43-1423/U

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