The AlMo0.5NbTa0.5TiZr refractory high entropy superalloy: Experimental findings and comparison with calculations using the CALPHAD method

•Microstructural characterization of the AlMo0.5NbTa0.5TiZr refractory superalloy in the as-cast state is reported for the first time and compared with hitherto known annealed state.•The detailed CALPHAD analysis with Scheil-Gulliver and equilibrium calculations reveal new insights into understanding the nature of the studied alloy by comparing with the experimental data.•The equilibrium-based CALPHAD approach used here pinpoints the presence of a miscibility gap between two bcc-based phases, confirming the hypothesis that this alloy is formed by spinodal decomposition.•Differential thermal analysis was reported for the first time for this alloy, revealing a good agreement between measured phase transformation temperatures and calculated values.