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

Abstract

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.

Effect of homogenization on microstructure evolution and mechanical properties of aged Mg-Nd-Sm-Zn-Zr alloy

“…Magnesium (Mg) -rare earth (RE) alloys have been greatly developed in the past decades due to their low density, good corrosion resistance and potential for energy saving [1][2][3][4][5]. Hence, the Mg-RE alloys are widely applied in aerospace, electronic communication and automobile applications [6].…”

The Microstructures and Tensile Properties of As-Extruded Mg–4Sm–xZn–0.5Zr (x = 0, 1, 2, 3, 4 wt %) Alloys

“…Rare earth (RE) metals have been proved to play an important role in improving mechanical properties of Mg alloys [4]. There has been a great deal of research on 1Mg-Y [5][6][7][8], Mg-Gd [9][10][11][12][13] and Mg-Nd [14] alloys, and some of the alloys exhibit good mechanical properties at elevated temperature. As one of the light rare earth elements, Sm has a maximum solubility of about 5.8 wt %, which even is higher than that of Nd (3.6 wt %) in solid Mg.…”

Corrosion and Discharge Behaviors of Mg-Al-Zn and Mg-Al-Zn-In Alloys as Anode Materials

“…Magnesium and its alloys are promising candidates for use in aerospace, vehicle, and electric products due to their high ratio of strength to weight, low density, and good castability [1][2][3]. Considerable investigations have been conducted to clarify the corrosion mechanism and to achieve desirable corrosion resistance by designing and developing alloys of high corrosion resistance, inhibitors, and coatings [4][5][6][7][8][9][10][11][12].…”