| Abstract Scope |
Since 2016, we have reported a series of refractory high-entropy ceramics (HECs), including MB2, MB, M3B4, and MB4 borides; fluorite-based 5- to 21-component refractory oxides with long- and short-range order; and MSi2 and M5Si3 silicides. In 2020, we further proposed extending HECs to "compositionally complex ceramics (CCCs)," where non-equimolar compositions and the presence of long- or short-range order, although reducing configurational entropy, create new opportunities to tailor and enhance properties, often surpassing those of higher-entropy counterparts. See a recent Perspective [Journal of Materiomics, 12, 101173 (2026)] for a discussion of HECs and CCCs. This talk will further discuss our studies of dual-phase high-entropy boride-carbide ultrahigh-temperature ceramics [JECS 2020], high-temperature-stable nanocrystalline or ultrafine-grained refractory high-entropy alloys [JMS 2023; Intermetallics, in revision], ultrafast high-temperature sintering (UHS) of refractory compositionally complex alloy-carbide (RCCA-CCC) composites [Scripta 2025], and induction ultrafast sintering (IUS) of RCCA-CCC composites and compositionally complex silicides [Scripta 2025 and unpublished results]. |