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| Modification Performance of the Al-P Master Alloy for Eutectic and Hypereutectic Al-Si Alloys |
| LIU Xiangfa; QIAO Jinguo; LIU Yuxian; LI Shitong; BIAN Xiufang |
| Key Laboratory of Liquid Structure and Heredity of Materials;Ministry of Education; Shandong University; Jinan 250061 |
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Cite this article:
LIU Xiangfa; QIAO Jinguo; LIU Yuxian; LI Shitong; BIAN Xiufang. Modification Performance of the Al-P Master Alloy for Eutectic and Hypereutectic Al-Si Alloys. Acta Metall Sin, 2004, 40(5): 471-476 .
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Abstract A new type of Al-2.5%P master alloy has been developed, which can
be used to modify eutectic
and hypereutectic Al-Si alloys. The
modifying performance, the P distribution inside Si phases and modification
mechanisms were investigated. It has been found that the
Al-P master alloy can remarkably refine primary Si
grains in hypereutectic Al-Si alloy and its
σb,20 ℃ and δb,20 ℃ can
increase by 19.0% and 125% respectively; σb,20 ℃ and σb,300 ℃of modified eutectic Al-Si alloy can increase by 11.1%
and 18.9% respectively as result of the appearance of fine
primary Si grains and shorter eutectic Si crystals. AlP particles are
easily found in the center of some primary Si phases in
treated hypereutectic Al-Si alloy, while AlP and dissociative P are
observed in Si phase in modified eutectic Al--Si alloy. It is
considered that there are two modification mechanisms for eutectic
Al-Si alloy, one is heterogeneous nucleation and refining of primary Si phase
by AlP particles, and the other is P atoms
modify the morphologies of Si
phases. The modification
for the hypereutectic Al-Si
alloy mainly depends on heterogeneous nucleation mechanism
induced by AlP particles.
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Received: 13 February 2003
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