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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Transformation of microstructure after modification of A390 alloy
ZHANG Ying(张  英)1, 2, YI Dan-qing(易丹青)1, LI Wang-xing(李旺兴)2,
REN Zhi-sen(任智森)2, ZHAO Qun(赵  群)2, ZHANG Jun-hong(张

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Zhengzhou Research Institute of China Aluminum Company, Zhengzhou 450041, China

Abstract:A hypereutectic aluminum-silicon alloy with content of 17%Si, designed as A390, was modified. The change of microstructure was identified by optical microscopy. The results show that phosphorus can change the morphology and size of the primary silicon and control the length of needle-like eutectic silicon or dendrite. After modified by phosphorus, the primary silicon of star-like and coarse platelet is changed to polygonal with less cute angles and decreasing average size. The eutectic silicon is also changed because it grows from the tip of angles on the primary silicon and is influenced by the morphology and size of primary silicon. The eutectic silicon changes from needle-like or dendrite shape to short bars and dots with less average length.

 

Key words: aluminum-silicon alloys; modification; phosphorus; primary silicon; eutectic silicon

ISSN 1672-7029
CN 43-1423/U

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