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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 4    August 2002

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Enthalpies of formation of compounds in
Al-Ni-Y system
P. Nash1, H.N. Su1,O. Kleppa2

1. Thermal Processing Technology Center, Illinois Institute of Technology,
10W 32nd St, Chicago, IL, 60616, USA;
2. James Franck Institute, University of Chicago, 5640S Ellis Ave, 
Chicago, IL, 60637, USA

Abstract:The enthalpies of formation of the ternary compounds Al4NiY, Al2NiY, Al2Ni6Y3, Al16Ni3Y, AlNiY, Al3Ni2Y, AlNi8Y3, Al7Ni3Y2, and of the binary compounds Al2Y containing nickel and Ni5Y containing aluminum have been determined by high temperature reaction calorimetry. The enthalpy values measured are compared to previously published results where available as well as extended Miedema model predict ions. The melting points of the compounds were determined by DTA and X-ray diffraction was used to confirm the crystal structures of the compounds. The enthalpies of formation of the ternary compounds show a maximum along the 50%Al (mole fraction) section. The ternary compounds appear along lines of constant yttrium content consistent with binary compound solubility extensions.

 

Key words: enthalpy of formation; compound; Al-Ni-Y system

ISSN 1672-7029
CN 43-1423/U

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