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The La doped WC/Co powder was prepared by high energy ball milling. The changes of crystal structure, micrograph and defect of the powder were investigated by means of XRD (X-ray diffraction), SEM (scanning electron microscope) and DTA (differential thermal analysis). The results show that adding trace La element into carbides is effective to minish the grain size of WC/Co powder. The La doped carbides powder with grain size of 30nm can be obtained after 10h ball milling. The XRD peak of Co phase disappeared after 20h ball milling, which indicated solid solution (or secondary solid solution) of Co phase in WC phase. The La doped powder with grain size of 10nm is obtained after 30h ball milling. A peak of heat release at the temperature of 470℃ was emerged in DTA curve within the range of heating temperature, which showed that the crystal structure relaxation of the powder appeared in the process of high energy ball milling. After consolidated the La doped WC/Co alloy by high energy ball milling exhibits
The changes in crystal structure, micrograph and defect of the powder were investigated by means of XRD (X-ray diffraction), SEM (scanning electron microscope) and DTA (differential scanning electron microscope) The results show that adding trace La element into carbides is effective to minish the grain size of WC / Co powder. The La doped carbides powder with grain size of 30 nm can be obtained after 10h ball milling. The XRD peak of Co Phase-depleted after 20h ball milling, which indicated solid solution (or secondary solid solution) of Co phase in WC phase. The peak of heat release at the temperature of 470 ℃ was emerged in DTA curve within the range of heating temperature, which showed that the crystal structure relaxation of the powder was in the process of high energy ball milling. After consolidated the La doped WC / Co alloy by high energy b all milling exhibits