Experimental investigation and thermodynamic reassessment of the Ir-rich zone in the Al–Ir system

The homogeneity range of the B2-(AlIr) phase and the phase equilibria in the Ir-rich region of the Al–Ir system were experimentally investigated using scanning electron microscopy/energy-dispersive spectroscopy and electron probe microanalyzer. Thermodynamic assessment of the Al–Ir binary system was performed using the calculation of phase diagram approach based on the experimental data from literature and this work. A self-consistent thermodynamic description for this binary system was developed and the calculated Al–Ir phase diagram agrees with the experimental data very well.