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Experimental Investigation of the Mg-Nd-Zn Isothermal Section at 300 °C

Title:

Experimental Investigation of the Mg-Nd-Zn Isothermal Section at 300 °C

Mostafa, Ahmad and Medraj, Mamoun (2015) Experimental Investigation of the Mg-Nd-Zn Isothermal Section at 300 °C. Metals, 5 (1). pp. 84-01. ISSN 2075-4701

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Abstract

The Mg-Nd-Zn isothermal section at 300 °C was established in the full composition range using diffusion couples and equilibrated key alloys. Microstructural characterization was carried out using WDS, XRD, and metallographic methods. The homogeneity ranges of the binary and ternary compounds were determined by WDS analysis. Six ternary compounds were observed in the Mg-Nd-Zn system at 300 °C. These are: τ1(Nd5Mg21+xZn45−x; 0 ≤ x ≤ 4), τ2 (Nd5Mg3+yZn25−y; 0 ≤ y ≤ 1), τ3 (NdMg1+zZn2−z; 0 ≤ z ≤ 0.44), τ4 (Mg40Nd5Zn55), τ5 (Mg22–23.5Nd15.5–17.5Zn59.1–61.8), and τ6 (Nd2(Mg,Zn)23). τ5 was found to have a homogeneity range of 22.0–23.5 atom % Mg, 15.5–17.6 atom % Nd and 59.1–61.8 atom % Zn and τ6 was found to have 54.1–61.3 atom % Mg at a constant Nd of 8.0 atom %. The ternary solubility of Zn in Mg-Nd compounds was found to increase with the decrease in Mg concentration. Accordingly, (Mg41Nd5) was found to have an extended solubility of 3.1 atom % Zn, whereas (Mg3Nd) was found to have 30.0 atom % Zn. MgNd was found to have a complete substitution of Mg by Zn. The maximum solid solubility of Zn in α-Mg was measured as 4.8 atom % Zn.

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:Metals
Date:12 January 2015
Digital Object Identifier (DOI):10.3390/met5010084
Keywords:Mg-Nd-Zn system; diffusion couples; experimental investigation; ternary phase diagram
ID Code:979610
Deposited By: AHMAD MOSTAFA
Deposited On:24 Feb 2015 17:49
Last Modified:18 Jan 2018 17:49
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