Abstract
The ultrafine grain WC–10Co alloys were prepared by the planetary ball milling method and low pressure sintering. The effects of LaB 6 addition on the microstructure and mechanical properties of the based alloys were investigated by X-ray diffraction, scanning electron microscope and mechanical property testing. It has been shown that the grain growth and regularization of WC particles occur simultaneous with the addition of LaB 6. Adding suitable amount of LaB 6 improves the density, hardness and fracture toughness of the ultrafine WC–10Co alloys, and decreases the volume fraction of Co 3W 3C phase in ultrafine WC–10Co alloys.
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