Abstract
The effect of rare earth (RE) elements on the morphologies and sizes of Si phases in the hypereutectic Al-Si alloys modified with P was investigated. The results show that the addition of La element to the hypereutectic Al-Si alloys can enhance the effect of P element on the modification of the primary Si phases. In the multiplex modification of RE-P, the primary Si phase is refiner and the shape of the eutectic Si is changed from long needle-like to short rod-like. Moreover, the agglomeration rate of the primary Si phase is slowed greatly. Even the melt is held for 6 h, the average size of the primary Si phase is still satisfied. The results analyzed by scanning electron microscope (SEM) indicate that La is richer at Al-Si interface than that in α-Al or primary Si phase. The higher the La content in the Al-Si interface, the smaller the primary Si phase.
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Project supported by the National Natural Science Foundation of China (Grant No.50075051)
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Ouyang, Zy., Mao, Xm. & Hong, M. Multiplex modification with rare earth elements and P for hypereutectic Al-Si alloys. J. of Shanghai Univ. 11, 400–402 (2007). https://doi.org/10.1007/s11741-007-0416-1
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DOI: https://doi.org/10.1007/s11741-007-0416-1