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Experimental Investigation of the Ce-Mg-Mn Isothermal Section at 723 K (450°C) via Diffusion Couples Technique

Title:

Experimental Investigation of the Ce-Mg-Mn Isothermal Section at 723 K (450°C) via Diffusion Couples Technique

Mostafa, Ahmad and Medraj, Mamoun (2014) Experimental Investigation of the Ce-Mg-Mn Isothermal Section at 723 K (450°C) via Diffusion Couples Technique. METALLURGICAL AND MATERIALS TRANSACTIONS A . pp. 1-17. ISSN 1543-1940

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Official URL: http://link.springer.com/article/10.1007/s11661-01...

Abstract

The isothermal section of the Ce-Mg-Mn phase diagram at 723 K (450°�C) was established
experimentally by means of diffusion couples and key alloys. The phase relationships in the
complete composition range were determined based on six solid–solid diffusion couples and
twelve annealed key alloys. No ternary compounds were found in the Ce-Mg-Mn system at
723 K (450°C). X-ray diffraction and energy-dispersive X-ray spectroscopy spot analyses were used for phase identification. EDS line-scans, across the diffusion layers, were performed to determine the binary and ternary homogeneity ranges. Mn was observed in the diffusion couples
and key alloys microstructures as either a solute element in the Ce-Mg compounds or as a pure element, because it has no tendency to form intermetallic compounds with either Ce or Mg. The fast at. interdiffusion of Ce and Mg produces several binary compounds (CexMgy) during the diffusion process. Thus, the diffusion layers formed in the ternary diffusion couples were similar to those in the Ce-Mg binary diffusion couples, except that the ternary diffusion couples contain layers of Ce-Mg compounds that dissolve certain amount of Mn. Also, the ternary diffusion
couples showed layers containing islands of pure Mn distributed in most diffusion zones. As a result, the phase boundary lines were pointing toward Mn-rich corner, which supports the tendency of Mn to be in equilibrium with all the phases in the system.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Mechanical and Industrial Engineering
Item Type:Article
Refereed:Yes
Authors:Mostafa, Ahmad and Medraj, Mamoun
Journal or Publication:METALLURGICAL AND MATERIALS TRANSACTIONS A
Date:6 March 2014
Funders:
  • Magnesium Network (MagNET)
Digital Object Identifier (DOI):10.1007/s11661-014-2251-z
Keywords:Ce-Mg-Mn system, diffusion couples, experimental investigation, ternary phase diagram
ID Code:978320
Deposited By: AHMAD MOSTAFA
Deposited On:10 Mar 2014 13:34
Last Modified:18 Jan 2018 17:46

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