《A new technique to modify hypereutectic Al–24%Si alloys by a Si–P master alloy 吴亚平》.pdfVIP

Journal of Alloys and Compounds 477 (2009) 139–144 Contents lists available at ScienceDirect Journal of Alloys and Compounds j o u rn al h omepage: w w w. elsev /locate/jallcom A new technique to modify hypereutectic Al–24%Si alloys by a Si–P master alloy Yaping Wu, Shujun Wang, Hui Li, Xiangfa Liu ∗ Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University, 73 Jingshi Road, Jinan 250061, PR China a r t i c l e i n f o a b s t r a c t Article history: The modification effect of a Si–P master alloy on Al–24%Si alloy was investigated by using electron probe Received 9 September 2008 micro-analyzer (EPMA) and optical microscopy (OM). The dissolution problem of the Si–P master alloys Received in revised form was solved by changing the sequence of addition. When the Si–P master alloy was added into Al melt 30 September 2008 before the addition of silicon, the best modification effect could be achieved. The modification parameters Accepted 2 October 2008 Available online 20 November 2008 of the master alloy on Al–24%Si alloy were optimized through designing and analyzing the orthogonal experiment, and their influences on the modification effect were discussed. The results show that the influence of temperature on the modification effect is the greatest, followed by the addition level, and Keywords: Hypereutectic Al–Si alloys the holding time is the least. The optimi