United modification of Al-24Si alloy by Al-P and Al-Ti-C master alloys
(1. Key Laboratory of Liquid Structure and Heredity of Materials,
Ministry of Education,Shandong University, Ji′nan 250061, China;
2. College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)
Ministry of Education,Shandong University, Ji′nan 250061, China;
2. College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)
Abstract: The modification effect of a new type of Al-P master alloy on Al-24Si alloys was investigated. It is found that excellent modification effect can be obtained by the addition of this new type of Al-P master alloy into Al-24Si melt and the average primary Si grain size is decreased below 47μm from original 225μm. It is also found that the TiC particles in the melt coming from Al8Ti2C can improve the modification effect of the Al-P master alloy. When the content of TiC particles in the Al-24Si melt is 0.03%, the improvement reaches the maximum and keeps steady with increasing content of TiC particles. Modification effect occurs at 50min after the addition of the Al-P master alloy and TiC particles, and keeps stable with prolonging holding time.
Key words: Al-P master alloy; Al-Si alloy; modification; TiC