A ternary linear compound T_2 and Its phase equilibrium relationships in Mg-Zn-Nd system at 400°C

摘要

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 T_2 phase has been identified. The general chemical formula of T_2 phase is (Mg, Zn)_(11.5)Nd and the crystal structure of that is C-centered orthorhombic. As the results, the other three ternary compounds T_1 phase, T_3 phase and T_4 phase have also been identified. The partial isothermal section of phase diagram of Mg-Zn-Nd system at 400°C has been established.