Abstract
Tungsten borides have been explored as potential candidates for superhard materials. However, the insufficient density and strength of covalent bonds in these borides typically limit their hardness to less than 40 GPa. Tungsten boride-based composites with varying titanium content were synthesized using arc melting in this study. The results show that WB2-WB3-B4C-TiB2 composites with the highest hardness (∼37 GPa) were obtained. The hardening mechanism is attributed to the dispersion of TiB2 nanocrystals formed in composites. The approach can serve as a valuable reference for the design and development of other boride composites with ultra-high hardness.
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