| Title： | Grain refinement of primary silicon in hypereutectic Al-Si alloys by different P-containing compounds | |
| Author： | Benson Kihono Njuguna1, Jia-yan Li1, Yi Tan1, Qian-qian Sun3, *Peng-ting Li1, 2 | |
| Address： | 1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China; 2. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China; 3. Shandong Shanda Al&Mg Melt Technology Company Limited, Jinan 250061, China | |
| Key words： | grain refinement; primary silicon; master alloy; AlP compound | |
| CLC Nmuber： | TG146.21 | |
| Document Code： | A | |
| Article ID： | 1672-6421(2021)01-037-08 | |
| Abstract： |
The grain refinement behavior of Si-3P, Si-25Mn-10P, and Al-10Si-2Fe-3P master alloys on hypereutectic Al-24Si alloy was studied. Microstructure analysis indicates that the P-containing compounds in the three master alloys are SiP, MnP, and AlP, respectively. The coarse flower-like primary silicon in the Al-24Si alloy transforms into smaller, well-distributed blocks with the addition of various master alloys. When pouring at 840 °C, the average grain size of the primary silicon refined by Si-25Mn-10P master alloy with a holding time of 30 min is about 18 μm, which is significantly smaller than those refined by Si-3P and Al-10Si-2Fe-3P master alloys. The grain size shows an increasing trend when the holding time is further prolonged. Higher holding temperature has a positive effect on the grain refinement of Si-25Mn-10P master alloy. The grain refinement mechanism of the three master alloys was also discussed.
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