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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 9    No. 4    December 1999

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Observation of crystal nuclei of aluminum refined by Al-Ti-B master alloy
Ma Hongtao; Fang Hongsheng; Zhang Baiqing; Li Jianguo

Department of Materials Science and Engineering,Tsinghua University, Beijing 100084, P. R. China

Abstract:The crystal heterogeneous nuclei of high purity aluminum refined by Al-Ti-B master alloy were studied by SEM and the mechanism of heterogeneous nucleation was discussed. It was found that the cluster of TiB2 particles was in the center of grains, and a number of small protrusions were found on the surface of the particles. It was also found that the cluster was surrounded with the dendrites or circles enriched in Ti.

 

Key words: aluminum; heterogeneous nucleation; refining mechanism

ISSN 1672-7029
CN 43-1423/U

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