Mechanical behavior of high-entropy intermetallic compounds and high-entropy ceramics

High-entropy intermetallic compounds (HEICs) and high-entropy ceramics (HECs) are both novel materials obtained by introducing chemical disorder through the mixing of multiple primary components. In comparison to traditional materials, they exhibit superior mechanical properties. However, the widespread application of HEICs and HECs are greatly hindered by their inferior ductility/toughness. In addition, the conventional trial-and-error method for designing HEICs and HECs is time-consuming and labor-intensive, and the mechanical properties of the final samples are highly uncertain. The primary aim of this review is to summarize the latest research progress on HEICs and HECs, with a focus on relevant phase structure prediction criteria and strengthening/toughening strategies, in order to accelerate their engineering applications. In this article, we have compiled the applications of machine learning and descriptors criterion in the prediction of phase structures. Furthermore, various strengthening/toughening strategies applied in HEICs and HECs were discussed, including solid solution strengthening, second-phase strengthening, and nano-composite strengthening, etc. Finally, the challenges and future research directions of HEICs and HECs were also addressed.