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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 3    June 2003

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Influence of La on microstructures of hypereutectic Al-Si alloys
ZHANG Di(张 荻), YI Hong-kun(易宏坤),
Lü Wei-jie(吕维洁), FAN Tong-xiang(范同祥)

State Key Laboratory of Metal Matrix Composites,
Shanghai Jiaotong University,Shanghai 200030, China

Abstract:The modification effects of La addition on the microstructural evolution of hypereutectic Al-17% Si and Al-25% Si(mass fraction) alloys were investigated. The Al-Si alloys were fabricated using conventional casting, spray atomization and deposition processing. Microstructures were examined using optical microscopy and SEM. The results show that the addition of La has strong modification effect on the conventional microstructure of as-cast Al-Si alloys, while little effect on that of spray-deposited Al-Si alloys. EDS and XRD experiments show that La reacts with Al and Si to form some intermetallics, which can be represented as AlSi2La2 consisting of LaSi2 and some unknown ternary AlSixLay phase. Spray atomization and deposition processing show significant microstructural modification in Al-17Si-xLa alloys as compared to their as-cast counterpart. Equiaxed Si particulates were observed evenly distributed in all the spray-deposited Al-17Si-xLa alloys regardless of the addition of La.

 

Key words:  hypereutectic Al-Si alloy; casting; spray atomization and deposition; modification

ISSN 1672-7029
CN 43-1423/U

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