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Comparison of the mechanically alloyed (V,W)C and (V,W)C-co powders
(Elsevier B.V., 2008) Bolokang, AS
Milling was carried out in flowing argon but was interrupted at regular time intervals to take samples for Xray diffraction (XRD). Because of exposure to air during the interruptions the powder was partly oxidized. The oxides formed did not appear in XRD patterns because they were of extremely fine grain size.As a result of the loss ofVandWthrough oxidation, free carbonwas also found in the final powder. The lattice parameter of the (V,W)C powder increased with milling time up to a maximum, then it decreased, which suggests that the amount ofWin (V,W)C increased with milling time up to a maximum and then decreased. The crystallite size of the (V,W)C powder was calculated fromthe X-ray data and was found to be in the nmrange (down to approximately 8 nm). Subsequent uninterruptedmilling produced a powder which was freer from oxides and free carbon