A new nucleation mechanism of primary Si by peritectic-like coupling of AlP and TiB2 in near eutectic Al-Si alloy

作者：Yu Lina; Liu Xiangfa^*; Ding Haimin; Bian Xiufang

来源：Journal of Alloys and Compounds, 2007, 432(1-2): 156-162.

DOI：10.1016/j.jallcom.2006.06.005

• Al-Si alloy
• primary silicon
• modification
• nucleation mechanism

The effect of TiB2 particles on phosphorous modification efficiency in near eutectic Al-Si alloy and a new nucleating mechanism was studied in this paper. The results show that it presents remarkable phosphorous modification effect after the addition of 0.2%Al-5Ti-1B alone into the Al-12.6Si alloy, the modification efficiency can be improved and the sizes of primary Si can be obviously refined after the addition of 0.2%Al-5Ti-1B in the P modified Al-12.6Si alloy. EPMA shows there is a coupling of AlP and TiB2 particles in the centre of primary Si, and a new nucleation mechanism of primary Si by peritectic-like coupling of AlP and TiB2 was presented. The formation mechanism of peritectic-like coupling of the particles was also discussed.

• 出版日期2007-4-25
• 单位山东大学