Experimental Investigation and Thermodynamic Assessment of the Ternary Al–Ni–Er System

Al–Ni–Er is an essential system in heat-resistant Al alloys. However, the aluminum-rich corner of this system, which has most practical application significance, not been fully studied. In work, phase equilibria are investigated via experiments and thermodynamic modeling. The isothermal sections Al-rich ternary at 600 700 °C were determined through equilibrated alloys combined with scanning electron microscopy (SEM), probe microanalysis (EPMA) X-ray diffractometry (XRD). addition, vertical Al0.7Ni0.3–Al0.7Er0.3 Al0.8Ni0.2–Al0.8Er0.2 measured differential calorimetry (DSC) analysis. A new compound, τ14-Al12Ni2Er3, was discovered. On basis experimental results previous studies, optimized calculation diagrams (CALPHAD) method. calculated section good agreement literature data.