Effect of WC/Co coherency phase boundaries on Fracture toughness of the nanocrystalline cemented carbides

HX Xie and XY Song and FX Yin and YG Zhang, SCIENTIFIC REPORTS, 6, 31047 (2016).

DOI: 10.1038/srep31047

The effect of coherency WC/Co phase boundaries on the fracture toughness of the nanocrystalline WC-Co cemented carbides is studied by MD simulation method. The simulation results show that the nanocrystalline WC-Co cemented carbides with coherency WC/Co phase boundaries has higher fracture toughness than that without coherency WC/Co phase boundaries. Moreover, the mechanism of why coherency WC/Co phase boundaries can improve the fracture toughness of the nanocrystalline cemented carbides is also investigated. It is found the fact that the separation energy of the coherent WC/Co phase boundary is larger than that of the incoherent WC/Co phase boundaries is the main reason for this excellent mechanical property.

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