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Metals 2014, 4(2), 168-195; doi:10.3390/met4020168
Article

Phase Equilibria of the Ce-Mg-Zn Ternary System at 300 °C

 and
*
Department of Mechanical and Industrial Engineering, Concordia University, 1455 de Maisonneuve Blvd. West, Montreal, QC H3G 1M8, Canada
* Author to whom correspondence should be addressed.
Received: 10 April 2014 / Revised: 13 May 2014 / Accepted: 15 May 2014 / Published: 28 May 2014
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Abstract

The isothermal section of the Ce-Mg-Zn system at 300 °C was experimentally established in the full composition range via diffusion multiple/couples and key alloys. Annealed key alloys were used to confirm the phase equilibria obtained by diffusion multiple/couples and to determine the solid solubility ranges. Spot analysis was carried out, using wavelength dispersive X-ray spectroscopy (WDS), to identify the composition of the observed phases. The composition profiles were obtained using WDS line-scans across the diffusion zones. X-ray diffraction (XRD) was performed to identify the phases in the annealed alloys and to confirm the WDS results. Eight ternary compounds, in the Ce-Mg-Zn isothermal section at 300 °C, were observed from 45–80 at.% Zn. These are: τ1 (Ce6Mg3Zn19), τ2 (CeMg29Zn25), τ3 (Ce2Mg3Zn3), τ4 (CeMg3Zn5), τ5 (CeMg7Zn12), τ6 (CeMg2.3xZn12.8+x; 0 ≤ x ≤ 1.1), τ7 (CeMgZn4) and τ8 (Ce(Mg1yZny)11; 0.096 ≤ y ≤ 0.43). The ternary solubility of Zn in the Ce-Mg compounds was found to increase with a decrease in Mg concentration. Accordingly, the ternary solid solubility of Zn in CeMg12 and CeMg3 was measured as 5.6 and 28.4 at.% Zn, respectively. Furthermore, the CeMg and CeZn showed a complete solid solubility. The complete solubility was confirmed by a diffusion couple made from alloys containing CeMg and CeZn compounds.
Keywords: Ce-Mg-Zn system; diffusion couples; diffusion multiple; experimental investigation; ternary phase diagram Ce-Mg-Zn system; diffusion couples; diffusion multiple; experimental investigation; ternary phase diagram
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Mostafa, A.; Medraj, M. Phase Equilibria of the Ce-Mg-Zn Ternary System at 300 °C. Metals 2014, 4, 168-195.

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