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Metals 2015, 5(1), 84-101; doi:10.3390/met5010084

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

Department of Mechanical and Industrial Engineering, Concordia University, 1455 de Maisonneuve Blvd. West, Montreal, QC H3G 1M8, Canada
Department of Mechanical and Materials Engineering, Masdar Institute, Masdar City, P. O. Box 54224, Abu Dhabi, UAE
Author to whom correspondence should be addressed.
Academic Editor: Xing-Qiu Chen
Received: 8 December 2014 / Accepted: 26 December 2014 / Published: 12 January 2015
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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+xZn45x; 0 ≤ x ≤ 4), τ2 (Nd5Mg3+yZn25y; 0 ≤ y ≤ 1), τ3 (NdMg1+zZn2z; 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. View Full-Text
Keywords: Mg-Nd-Zn system; diffusion couples; experimental investigation; ternary phase diagram Mg-Nd-Zn system; diffusion couples; experimental investigation; ternary phase diagram

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Mostafa, A.; Medraj, M. Experimental Investigation of the Mg-Nd-Zn Isothermal Section at 300 °C. Metals 2015, 5, 84-101.

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