标题：The investigation of continuous nucleation and refinement of primary Si in Al-30Si mushy zone
作者：Li, Dakui; Zuo, Min; Zhang, Qian; Liu, Xiangfa
作者机构：[Li, Dakui; Zuo, Min; Zhang, Qian; Liu, Xiangfa] Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jinan 250061, Peoples R Ch 更多
通讯作者地址：[Liu, XF]Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, 17923 Jingshi Rd, Jinan 250061, Peoples R China.
来源：JOURNAL OF ALLOYS AND COMPOUNDS
关键词：Hypereutectic Al-Si alloy; Primary Si; Nucleation mechanism; AlP;; Refinement
摘要：In this paper, the refinement performance of Al-P master alloy on mushy Al-30Si alloys was investigated and a new refining method was proposed. The results show that primary Si can be refined partially when the Al-P master alloy is added into mushy Al-30Si alloys, proving that the heterogeneous nucleation of primary Si is a continuous process even in liquid-solid state, which is also confirmed by EPMA results. On basis of these results, a new refining method named as continuous refining method has been proposed, i.e. continuously adding refiners at different temperatures during the cooling and solidifying stage of Al-30Si. Compared with the conventional refinement method by which the alloys are refined at high temperature, better refinement effect can be obtained in the new refinement method: the average size of primary Si is decreased to 30 mu m, and the tensile strength increases by 19.6%. Moreover, the mechanism of the continuous refining method was also discussed. (C) 2010 Elsevier B.V. All rights reserved.