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The main objective of the proposed project is the processing, detailed characterization and testing of new dual-phase high-entropy ultra-high temperature ceramics with expected significantly improved room and high/ultra-high temperature properties. This new dual phase HECs provide an excellent platform for controlling physical, thermal, fracture – mechanical, tribological, oxidation and other properties of the system via microstructural engineering, e.g., by changing the volume fraction, size and shape of each phase, in addition to tailoring the interfaces. These characteristics allow the materials to withstand extreme environments for potential applications in leading edge industries such as hypersonic vehicles, nuclear reactors.