Abstract
The slip plane for TiC0.8′ VC0.84 and substoichiometric tantalum carbide has been determined as {110} using microhardness indentation at room temperature. Under the same conditions, HfC0.98 also slips on {110} but TaC0.96 slips on {111}. At low temperatures {110} slip is characteristic of the Group IV and substoichiometric Group V transition metal carbides while stoichiometric Group V carbides probably deform preferentially on {111} at all temperatures. This behaviour is explained in terms of two models for the crystal structures of the carbides. The Group IV carbides are described by a close-packed metal lattice whereas the structure of stoichiometric Group V carbides is more open. Various physical and mechanical properties and the effects of changing carbon content have been correlated on the basis of the models. In particular, an explanation of the brittle-to-ductile transition in carbides is proposed.
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Rowcliffe, D.J., Hollox, G.E. Hardness anisotropy, deformation mechanisms and brittle-to-ductile transition in carbide. J Mater Sci 6, 1270–1276 (1971). https://doi.org/10.1007/BF00552040
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DOI: https://doi.org/10.1007/BF00552040