Essential Magnesium Alloys Binary Phase Diagrams and Their Thermochemical Data

Abstract

Magnesium-based alloys are becoming a major industrial material for structural applications because of their potential weight saving characteristics. All the commercial Mg alloys like AZ, AM, AE, EZ, ZK, and so forth series are multicomponent and hence it is important to understand the phase relations of the alloying elements with Mg. In this work, eleven essential Mg-based binary systems including Mg-Al/Zn/Mn/Ca/Sr/Y/Ni/Ce/Nd/Cu/Sn have been reviewed. Each of these systems has been discussed critically on the aspects of phase diagram and thermodynamic properties. All the available experimental data has been summarized and critically assessed to provide detailed understanding of the systems. The phase diagrams are calculated based on the most up-todate optimized parameters. The thermodynamic model parameters for all the systems except Mg-Nd have been summarized in tables. The crystallographic information of the intermetallic compounds of different binary systems is provided. Also, the heat of formation of the intermetallic compounds obtained from experimental, first principle calculations and CALPHAD optimizations are provided. In addition, reoptimization of the Mg-Y system has been done in this work since new experimental data showed wider solubility of the intermetallic compounds.

Evolution of Mechanical Twinning during Cyclic Deformation of Mg-Zn-Ca Alloys

“…From Mg-Ca binary phase diagram, the maximum solubility of Ca in Mg at 516.35 °C is 1.34 wt %, about 0.4 wt % at 350 °C and only 0.2 wt % at room temperature [33][34][35]. The literature shows contradicting information regarding the ternary compounds in the Mg-Zn-Ca system.…”

Experimental Study of the Mg-Ni-Y System at 673 K Using Diffusion Couples and Key Alloys

“…The maximum solubility of Ni in these compounds was confirmed using key samples as is discussed in Section 3.2. The homogeneity range of Mg2Y(δ) and Mg24Y5(ε) in the Mg-Y binary is about 70.5-75.8 and 84.2-88.1 at% Mg respectively, at 673 K [25,26]. In this diffusion couple, the solubility was found as 74.8-75.6 and 85-86.3 at% Mg for Mg2Y(δ) and Mg24Y5(ε), respectively which are within the reported solubility [25,26].…”

Pecularities of Gas Analysis in Al and Mg Powders

“…Several authors [4,5] are referring to a magnesium activity drop in binary Ni-Mg and ternary liquid Cu-Mg-Ni alloys. Activity of magnesium vapours in such alloys can be decreased 100 times in comparison to the activity of magnesium vapour over free melt.…”