High-entropy alloys (HEAs) typically consist of at least five elements in similar concentrations each and prove outstanding properties or combinations of properties, e.g. both strength and ductility, compared to conventional alloys. Developing refractory HEAs (RHEAs) from refractory metals offers a high potential for innovative high-temperature materials with capabilities exceeding state-of-the-art Ni-based superalloys which are limited to long-term temperatures of 1000 °C. This opens opportunities for increasing energy efficiencies of many high-temperature technologies, e.g. aerospace turbines and stationary turbines in power plants.The equiatomic RHEA AlCrMoTaTi proved a high oxidation resistance comparable to Ni-based superalloys. In this work, AlCrMoTaTi and its non-equiatomic derivatives Al3CrMoTaTi and AlCrMoTaTi3 are processed by powder metallurgy route. Investigations in the temperature range of 800 °C up to 1450 °C include formed phases and resulting microstructure, long-term microstructural stability, long-term oxidation resistance, hot corrosion resistance and mechanical properties. Experimental findings are supplemented by thermodynamic CALPHAD simulations.
Häslich et al. (Thu,) studied this question.
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