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


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

Mostafa, Ahmad ORCID: https://orcid.org/0000-0001-5625-1106 and Medraj, Mamoun (2014) Phase Equilibria of the Ce-Mg-Zn Ternary System at 300 °C. Metals, 4 (2). pp. 168-195. ISSN 2075-4701

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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 (CeMg2.3−xZn12.8+x; 0 ≤ x ≤ 1.1), τ7 (CeMgZn4) and τ8 (Ce(Mg1−yZny)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.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Mechanical and Industrial Engineering
Item Type:Article
Authors:Mostafa, Ahmad and Medraj, Mamoun
Journal or Publication:Metals
Date:28 May 2014
Digital Object Identifier (DOI):10.3390/met4020168
Keywords:Ce-Mg-Zn system; diffusion couples; diffusion multiple; experimental investigation; ternary phase diagram
ID Code:978673
Deposited On:09 Jun 2014 14:25
Last Modified:18 Jan 2018 17:47
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