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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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Al-rich part phase relation in Al-Mg-Sc system 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:Phase relation of the aluminium-magnesium-scandium system in the Al-rich range at 430℃ was investigated by means of multiphase diffusion couples along with electron probe microanalysis, X-ray diffraction and electron microscopy techniques. It consists of five single-phase fields, four 2-phase fields and one 3-phase field. The maximum solid solubilities of Mg and Sc in α(Al) solid solution at 430℃ are about 15.27%Mg(mole fraction) and 0.33%Sc, respectively. The maximum solid solubilities of Sc in Mg2Al3 and Mg17Al12 are about 1.08% and 0.03% at the same temperature. The diffusion path at 430℃ was constructed and interpreted by means of the Al-Mg-Sc equilibrium phase diagram assuming that local equilibrium is established at the phase boundaries.

 

Key words: Al-Mg-Sc; diffusion couple; isothermal section; diffusion path

ISSN 1672-7029
CN 43-1423/U

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