PHILOSOPHICAL MAGAZINE A JOURNAL OF THEORETICAL, EXPERIMENTAL AND APPLIED PHYSICS / Department of Materials Science, Northwestern University, Evanston, Illinois. 1965, No 8, vol.
12. -pp. 1-8.Slip in single crystals of tungsten monocarbide has been observed around Vickers pyramid hardness indentations. The slip plane is {1100} at room temperature and the slip directions are postulated to be the 0001 and 1120 . The Vickers hardness value on a (0001) face is approximately twice the value determined for a (llOO) face. This is attributed to the ease of motion of dislocations with ll20 Burgers vectors as opposed to the dislocations having 0001 Burgers vectors since the former can dissociate into 1123 partial dislocations. The occurrence of a {1100} slip plane is explained on the basis of the fact that a minimum number of only two covalent tungsten-carbon bonds need be broken for a unit of slip on this plane.
