High entropy materials (HEMs) as a research field in materials science and engineering has matured over the last few years. In 2004, Yeh et al. and Cantor et al. coined the term ‘high entropy alloys’ (HEAs) for the newly discovered multicomponent and multiprincipal (Co-CrFeNiMn) metallic cocktails; research activities were mainly centred on the metallic alloys. This has led to the discovery of many FCC and BCC HEAs, including refractory HEAs.
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