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Phase diagram and thermodynamic properties of the yttrium-zinc system

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Abstract

The phase relations of the yttrium zinc system have been reexamined. A total of eight compounds have been identified by differential thermal analysis, metallographic and X-ray diffraction techniques. The three compounds YZn, YZn2 and YZn8.5 melt congruently at 1105, 1080 and 890°C, respectively. The compounds YZn3, YZn3.67, YZn4.46, YZn6 and YZn12 all decompose peritectically at 905, 896, 882, 872 and 685°C, respectively. Three eutectics were found at 875°C and 23.2 wt pct Zn (29.12 at. pct), 1015°C and 51 wt pet Zn (59 at. pct) and at 863°C and 82 wt pct Zn (86 at. pct). A polymorphic transformation was observed in the YZn2 compound that proceeds at 750°C in the yttrium rich region but drops to approximately 630°C in the zinc rich region. The thermodynamic properties of the intermetallic compounds have been determined using the dewpoint method to measure the vapor pressure of zinc. The standard free energy relations vary from δG° (YZn) = −24,020 + 8.76T to δG° (YZn12) = -85,940 + 48.61T cal/mole.

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Authors and Affiliations

  1. Ames Laboratory of the U.S. Energy Research and Development Administration, 50011, Ames, IA

    J. T. Mason (Assistant Metallurgist) & P. Chiotti (Senior Metallurgist, Professor of Materials Science and Engineering)

  2. Iowa State University, 50011, Ames, IA

    P. Chiotti (Senior Metallurgist, Professor of Materials Science and Engineering)

Authors
  1. J. T. Mason
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  2. P. Chiotti
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Mason, J.T., Chiotti, P. Phase diagram and thermodynamic properties of the yttrium-zinc system. Metall Trans A 7, 287–291 (1976). https://doi.org/10.1007/BF02644469

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