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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 2    April 2002

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Change law of real vapor pressure of
Al element in Ti-xAl (x=25~50)
melt during ISM process
LIU Gui-zhong(刘贵仲), SU Yan-qing(苏彦庆), GUO Jing-jie(郭景杰),
DING Hong-sheng(丁宏升), JIA Jun(贾  均),FU Heng-zhi(傅恒志)

School of Materials Science and Engineering,
Harbin Institute of Technology, Harbin 150001, China

Abstract:A new model was established to calculate the real vapor pressure of the Al element in the molten Ti-xAl (x=25~50, mole fraction, %) alloy. The effects of the holding time, chamber pressure, mole fraction of Al and melting temperature on the real vapor pressure of Al element in the vacuum chamber were analyzed. Because of the impeding effect of the real vapor pressure on the evaporation loss rate, within a short time (less than 10s), the real vapor pressure tends to a constant value. When the chamber pressure is less than the saturated vapor pressure of the Al component, the real vapor pressure of Al is equal to the chamber pressure. While when the chamber pressure is larger than the saturated vapor pressure, the real vapor pressure is equal to the saturated vapor pressure of the Al element of the same condition.

 

Key words: real vapor pressure; Al element; ISM process; Ti-xAl melt

ISSN 1672-7029
CN 43-1423/U

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