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Superhard Nanocrystalline Cubic Silicon Carbide
In article number 2201212, Guoying Gao, Bo Xu, and co‐workers successfully synthesize nanocrystalline β‐SiC bulks with asymptotic Vickers hardness over the superhard threshold of 40 GPa, broadening the family of superhard materials. The frontispiece emphasizes the superhardness of nanocrystalline SiC bulk by scratching the cBN single crystal.
Superhard materials other than diamond and cubic boron nitride have been actively pursued in the past two decades. Cubic silicon carbide, i.e., β‐SiC, is a well‐known hard material with typical hardness <30 GPa. Although nanostructuring has been proven to be effective in enhancing materials’ hardness by virtue of the Hall–Petch effect, it remains a significant challenge to improve hardness of β‐SiC...
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