The addition of whiskers in the cemented carbide material can absorb the energy of crack propagation, and the absorbed energy is determined by the combination of the whisker and the matrix. Whisker toughening mechanism mainly as follows: ① whisker pull out toughening: whiskers in the external load from the matrix pulled out, due to interface friction and consume part of the external load energy, so as to achieve toughening purposes, the increase The effect of toughness is influenced by whisker and interface sliding resistance. There must be sufficient bonding between the whisker and the substrate interface so that the external load can be efficiently transferred to the whiskers, but not too large, in order to maintain a sufficient pull-out length. ② crack deflection toughening: When the crack tip is greater than the elastic modulus of the matrix when the second phase, the crack will deviate from the original forward direction along the interface or in the matrix expansion. Since the non-planar fracture of the crack has a larger fracture surface than the plane fracture, it can absorb more external energy, and thus play a role in toughening. The addition of whiskers or particles with high elastic modulus in the matrix can induce the mechanism of crack deflection toughening. ③ whisker bridging toughening: When the matrix fracture, the whisker can withstand external loads and cracks in the break between the surface to play a bridge connection. The bridging whiskers can produce a force to close the crack to the matrix, consume external load to work, and improve the toughness of the material.