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Five single-phase WB2- and MoB2-containing high-entropy borides (HEBs) havebeen made via reactive spark plasma sintering of elemental boron and metals. Alarge reactive driving force enables the full dissolution of 10-20 mol. % WB2to form dense, single-phase HEBs, including (Ti0.2Zr0.2Hf0.2Mo0.2W0.2)B2,(Ti0.2Ta0.2Cr0.2Mo0.2W0.2)B2, (Zr0.2Hf0.2Nb0.2Ta0.2W0.2)B2, and(Zr0.225Hf0.225Ta0.225Mo0.225W0.1)B2; the successful fabrication of suchsingle-phase WB2-containing HEBs has not been reported before. In theprocessing science, this result serves perhaps the best example demonstratingthat the phase formation in high-entropy ceramics can strongly depend on thekinetic route. A scientifically interesting finding is that HEBs containingsofter WB2 and/or MoB2 components are significantly harder than(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2 (with harder binary boride components). Thisexemplifies that high-entropy ceramics can achieve unexpected properties.

Dissolving and Stabilizing Soft WB2 and MoB2 Phases into High-Entropy Borides via Boron-Metals Reactive Sintering to Attain Higher Hardness