A ternary linear compound T2 and its phase equilibrium relationships in Mg–Zn–Nd system at 400 °C

The composition and the crystal structure of the phases in the alloys of Mg–Zn–Nd system at 400 °C have been studied by scanning electron microscopy (SEM), electron probe microanalysis (EPMA), X-ray diffraction (XRD) and selected area electron diffraction (SAED) of transmission electron microscopy (TEM). The phase equilibrium relationships have been identified. As a result, a linear ternary compound T2 phase has been identified. The general chemical formula of T2 phase is (Mg, Zn)11.5Nd and the crystal structure of that is C-centered orthorhombic. As the results, the other three ternary compounds T1 phase, T3 phase and T4 phase have also been identified. The partial isothermal section of phase diagram of Mg–Zn–Nd system at 400 °C has been established.