Effects of individual and combined additions of phosphorus,boron and cerium on primary and eutectic silicon in an Al-30Si alloy

查看全文 作　　者：DAI [1]Hongshang;LIU [1,2]Xiangfa

机构地区：[1]Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education of China), Shandong University, Jinan 250061, China;[2]Shandong Binzhou Bohai Piston Co. Ltd., Binzhou 256602, China

出　　处：《Rare Metals》索引2009年第28卷第6期,共5页

基　　金：supported by the National Science Fund for Distinguished Young Scholars (No.50625101);the Key Project of Science and Technology Research of the Ministry of Education of China (No.106103) 摘　　要：The modification of silicon in an Al-30Si alloy was studied using optical microscopy, electron probe micro-analysis, transmission electron microscopy and differential scanning calorimetry. It is found that phosphorus master alloys combined with boron master alloys have good modification effect on primary silicon but no evident modification effect on eutectic silicon, while boron combined with cerium has good modification effect on eutectic silicon. The results of differential scanning calorimetry show that phosphorus, boron or cerium addition and their combined addition have different undercooling effects on eutectic silicon. Many scholars thought that AlP particles were the nuclei of eutectic silicon when phosphorus was enough in the alloy. Our results show that β-(Al,Si,Fe) can still be the nucleus of plate-like eutectic silicon while AlP is the nucleus of primary silicon when there is enough phosphorus in the melt. In addition, the mechanism about the modification was also discussed. 关键词：共晶硅磷化铝合金相铝颗粒透射电子显微镜硼改性效果小学

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Effects of individual and combined additions of phosphorus,boron and cerium on primary and eutectic silicon in an Al-30Si alloy

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