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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 3    June 2003

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Phase relations of Al-4Mg-Sc-Zr quaternary system in Al-rich range at 430℃
XIA Chang-qing(夏长清), ZENG Fan-hao(曾凡浩), GU Yi(古 一)

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

Abstract:The 430℃ isothermal section of the Al-4Mg-Sc-Zr quaternary system in the Al-rich range was determined by means of equilibrium alloys with the use of microstructure, X-ray diffraction analysis and electron probe microanalysis. There coexist three single-phase fields, two two-phase fields and one three-phase field. It is established that the phase Al3Sc1-0.5Zr0-0.5 with L12 structure and Al3Zr1-0.8Sc0-0.2 with DO23 structure are in equilibrium with the α solid solution, Zr being dissolved in Al3Sc, further substituting for about 50% Sc(mole fraction) whilst Sc is present in the phase Al3Zr and the maximum substitution for Zr is about 20%.

 

Key words:  Al-4Mg-Sc-Zr phase diagram; isothermal section;intermetallis compound

ISSN 1672-7029
CN 43-1423/U

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