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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 5    October 2003

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Precipitated phases and thermodynamic analysis during solidification of Al-Fe-X system at slow cooling rate
TAN Dun-qiang(谭敦强), LI Wen-xian(黎文献),
XIAO Yu-de(肖于德), WANG Chong(王 冲)

School of Materials Science and Engineering,
Central South University, Changsha 410083, China

Abstract:The solidification curves of Al-8.5Fe, Al-8.5Fe-1.7Fe, Al-8.5Fe-1.7Si-1.3V alloys were examined by DTA under the condition of slow cooling rate, the phase constitutes were examined by OM and XRD. The results show that, under slow cooling rate, the phases in Al-8.5Fe alloy are mainly α(Al) and Al13Fe4, the phases in Al-8.5Fe-1.7Si alloy are mostly α(Al), Al13Fe4, α-AlFeSi, β-AlFeSi, and comparing to Al-8.5Fe-1.7Si alloy, no other phases form in the Al-8.5Fe-1.3V-1.7Si alloy, but the chemical compositions of the phases are changed and the thermal stability of α-AlFeSi phase and β-AlFeSi phase is improved, due to the partial substitution of V for Fe atoms. The phase formation was calculated by Thermo-calc software at equilibrium condition, the calculated results were agreement with the experimental results.

 

Key words: solidification curve; thermodynamic analysis; heat-resistant Al alloy

ISSN 1672-7029
CN 43-1423/U

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