Investigation of phase equilibria in the Ce-Co-Fe system during solidification

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作者
Fartushna, I. [1 ]
Mardani, M. [1 ]
Khvan, A. [1 ]
Donkor, E. [1 ]
Cheverikin, V. [1 ]
Kondratiev, A. [1 ]
Dinsdale, A. [2 ,3 ]
机构
[1] Thermochemistry of Materials Scientific Research Centre, NUST MISIS, Leninsky prosp. 4, Moscow,119049, Russia
[2] Hampton Thermodynamics Ltd, Hampton, United Kingdom
[3] BCAST, Brunel University London, Uxbridge,UB8 2AD, United Kingdom
关键词
Number:; 11.7971.2017/6.7; Acronym:; Minobrnauka; Sponsor: Ministry of Education and Science of the Russian Federation;
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摘要
Phase transformations in the Ce-Co-Fe ternary system have been studied using DTA, X-ray diffraction (XRD), scanning electron microscopy (SEM) and electron probe microanalysis (EPMA). No ternary compounds have been identified in this system. Liquidus and solidus projections and a Scheil diagram for solidification were constructed. At the solidus temperatures two continuous solid solutions form: (1) between isostoichiometric compounds Ce2Fe17 (Zn17Th2-type structure, hR57-R-3m) and Ce17Co2 (Th2Ni17-type structure, hP38-P63/mmc) and (2) between the Laves phases CeFe2 and CeCo2 (MgCu2-type structure, cF24-Fd-3m). Among the binary system-based phases, CeCo3 has the widest homogeneity region and dissolves up to 58 at% Fe at the solidus temperature. The homogeneity regions of the remaining phases are smaller. Five three-phase fields in the solidus surface result from four transition type and one eutectic invariant four-phase equilibria. © 2017 Elsevier B.V.
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页码:1682 / 1693
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