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Experimental study of the Ca–Mg–Zn system using diffusion couples and key alloys

Title:

Experimental study of the Ca–Mg–Zn system using diffusion couples and key alloys

Zhang, Yi-Nan and Kevorkov, Dmytro and Bridier, Florent and Medraj, Mamoun (2011) Experimental study of the Ca–Mg–Zn system using diffusion couples and key alloys. Science and Technology of Advanced Materials, 12 (2). 025003. ISSN 1468-6996

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Official URL: http://dx.doi.org/10.1088/1468-6996/12/2/025003

Abstract

Nine diffusion couples and 32 key samples were prepared to map the phase diagram of the Ca–Mg–Zn system. Phase relations and solubility limits were determined for binary and ternary compounds using scanning electron microscopy, electron probe microanalysis and x-ray diffraction (XRD). The crystal structure of the ternary compounds was studied by XRD and electron backscatter diffraction. Four ternary intermetallic (IM) compounds were identified in this system: Ca3MgxZn15−x (4.6≤x≤12 at 335 °C, IM1), Ca14.5Mg15.8Zn69.7 (IM2), Ca2Mg5Zn13 (IM3) and Ca1.5Mg55.3Zn43.2 (IM4). Three binary compounds were found to have extended solid solubility into ternary systems: CaZn11, CaZn13 and Mg2Ca form substitutional solid solutions where Mg substitutes for Zn atoms in the first two compounds, and Zn substitutes for both Ca and Mg atoms in Mg2Ca. The isothermal section of the Ca–Mg–Zn phase diagram at 335 °C was constructed on the basis of the obtained experimental results. The morphologies of the diffusion couples in the Ca–Mg–Zn phase diagram at 335 °C were studied. Depending on the terminal compositions of the diffusion couples, the two-phase regions in the diffusion zone have either a tooth-like morphology or contain a matrix phase with isolated and/or dendritic precipitates.

Divisions:Concordia University > Faculty of Engineering and Computer Science > Mechanical and Industrial Engineering
Item Type:Article
Refereed:Yes
Authors:Zhang, Yi-Nan and Kevorkov, Dmytro and Bridier, Florent and Medraj, Mamoun
Journal or Publication:Science and Technology of Advanced Materials
Date:2011
ID Code:974130
Deposited By:ANDREA MURRAY
Deposited On:12 Jun 2012 10:42
Last Modified:12 Jun 2012 10:42
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