Interface character distributions in WC/Co cemented carbide
Electron backscatter diffraction,five parameter analysis,overlap-pole-figure analysis and near coincident site analysis were used to investigate the interface character distributions of WC/WC grain boundaries and WC/Co phase boundaries in WC/Co cemented carbides under different heat treatment states.The results show that the WC/WC Σ2 grain boundaries with a fraction of 4.5%are generated in the oil-quenched sample after high temperature sintering.The fraction of Σ2 boundaries with interface matching features of{10-10}/{10-10}is 2.6%.The cobalt in this sample is basically face-centered-cubic structure,and the interface with the interface inter-connection features of{10-10}WC/{001}Co,{10-10}WC/{110}Co and{11-20}WC/{110}Co is the main part of the WC/Co phase boundary.After tempering at 800℃,the samples with atmosphere protection and slow cooling in the furnace have the proportion and characteristics of WC/WC Σ2 grain boundaries,which are very close to those of oil-quenched samples.The cobalt in this sample is primarily hexagonal structure,and the interface with the interface inter-connection features of{10-10}WC/{10-10}Co and{11-20}WC/{11-20}Co is the main part of the WC/Co phase boundary.
WC/Co cemented carbideelectron backscatter diffractioninterface character distributiongrain boundary inter-connection
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