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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 3    June 2001

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Refinement and thermal analysis
of hypereutectic Al-25%Si alloy
ZHANG Zhong-hua(张忠华), BIAN Xiu-fang(边秀房),
WANG Yan(王  艳), LIU Xiang-fa(刘相法)

The Key Laboratory of Liquid Structure and Heredity of Materials,
Ministry of Education, School of Materials Science and Engineering,
Shandong University, Jinan 250061, P.R. China

Abstract: Refinement and thermal analysis of hypereutectic Al-25%Si alloy were investigated with scanning electron microscope (SEM) and differential scanning calorimeter (DSC). The results show that the average size of primary silicon in Al-25%Si alloy without and with phosphorus addition are 250 μm and 30μm, respectively. But the primary and eutectic growth temperature is raised by about 17.3℃ and 4 ℃ respectively due to phosphorus addition. The primary nucleation temperatures are 745.0 ℃ and 762.0℃ for untreated and treated samples and in addition, the enthalpy changes of primary and eutectic transformation are -261.0  J/g and -397.3  J/g without phosphorus addition, -294.2 J/g and -386.1  J/g with phosphorus addition, respectively. Otherwise the mechanisms of refinement and thermal transformation of Al-25%Si alloy in solidifying process are also discussed.

 

Key words:  hypereutectic Al-Si alloys; refinement; differential scanning calorimeter; enthalpy

ISSN 1672-7029
CN 43-1423/U

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