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In this study, four unique groups of nano-cemented carbides with 8 wt.% Co   and trace amount of Mo and VC have been successfully synthesized. The effect   of Mo and VC has been investigated comprehensively on both the   microstructure and mechanical behavior of nano-cemented carbide. The results   show that Mo significantly increases hardness but decreases the fracture   toughnesses and VC slightly increases hardness and strongly increases   fracture toughness of nano-cemented carbide. It is found that the optimum Mo   and VC contents are both 0.5 wt.%. The average WC grain size is about 370   nm. The hardness is about 2350 HV30 and the fracture toughness is about 11.2   MPam-1/2

Effects of Mo and Vc on the microstructure and properties of nano-cemented carbides