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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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Specific heat of superheated Al-10Sr alloy melts
WANG Yan(王  艳), BIAN Xiu-fang(边秀房),
ZHANG Zhong-hua(张忠华), SUN Yi-min(孙益民)

The Key Laboratory of Liquid Structure and Heredity of Materials,
Ministry of Education, Shandong University, Ji′nan 250061, P.R.China

Abstract: The specific heat of superheated Al-10Sr melts was determined at different heating rates between 1 K/min and 20 K/min using a differential scanning calorimeter(DSC). As a whole, the specific heat increases with increasing temperature. A hump is observed on the specific heat curve at the temperature corresponding to the phase boundary temperature dependent on heating rate. Moreover, the hump shifts to higher temperature in the measured temperature range from about 840 ℃ to 890℃ with increasing heating rate. At certain temperature in the higher superheated zone, the specific heat of the melt as a function of temperature shows a sharp rise . The result indicates that disorder zone fraction begins to increase while atom clusters fraction decreases at the breaking temperature.

 

Key words:  superheat; Al-10Sr alloy melts; specific heat; heating rate; quasi-polycrystalline modeling

ISSN 1672-7029
CN 43-1423/U

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