Ce-Mg-Nd System

Thermodynamic descriptions of core systems are of fundamental importance to the TCS Mg-based Alloys Database (TCMG). As an example, this section presents the modeling results of a core ternary system, Ce-Mg-Nd.

The modeling highlights the use of experimental data from as-cast alloys, together with those from heated alloys. Heated alloys help to determine the phase equilibria in the system, while as-cast alloys provide information on phase transition during the course of solidification although it is in general more difficult to analyze an as-cast alloy than a heated alloy.

Figure 1 shows calculated Ce-Mg-Nd isothermal section at 773 K. Figure 2 shows a calculated Ce-Mg-Nd liquidus projection, in comparison with phases observed in as-cast alloys.

The phase formation sequences in the six alloy compositions are summarized as follows.

• A and B: (Mg) > Mg₁₂R; C: Mg₁₂R > ?; D: Mg₁₂R +(Mg) ?; E: Mg₃R > Mg₁₂R; F: Mg₄₁R₅ > Mg₁₂R. The question mark "?" means either uncertain or unknown.

• The phase formation in alloys C, D, and E can be interpreted with the metastable calculation.

Reference

[2014Che] H.-L. Chen, Modeling of the Ce-Mg-Nd ternary system in TCMG3, Thermo‑Calc Software (2014).