Author:Nabarro, FRNDate:15 Apr 1994The theory of work hardening in stage IV depends on the relation between the relative misorientation Psi of neighbouring subgrains and the plastic strain gamma (Psi = B gamma exp). The value of the constant B is suggested to be better related ...Read more
Author:Nabarro, FRNDate:Feb 2002The creep rate in a land-based power station must be less than 10(-11) s(-1). At these low rates of deformation the transport of matter occurs by the migration of vacancies rather than by the glide of dislocations. A quantitative understanding ...Read more
Author:Morrison, A; Hietkamp, S; Van Vuuren, DSDate:Aug 2004A direct reduction process for refractory oxides and a life cycle analysis comparison with conventional pelletising and sintering process for chargechrome are presented. The new route has potential to reduce the environmental impact of the ...Read more
Author:O'Quigley, DGF; Luyckx, S; James, MNDate:1997This paper reports the results of a comprehensive investigation into the abrasion resistance of WC-Co alloys, as measured by the ASTM Standard B 611-85 test. The alloys ranged from 3 to 50 wt% and from 0.6 to 5 mu-m average grain size. Careful ...Read more
Author:Milman, YV; Luyckx, S; Northrop, ITDate:1999The Vickers hardness of WC-Co alloys has been measured at temperatures ranging from -196 to 900 degrees C. The cobalt content of the alloys ranged from 10 to 24 vol% and the grain size from 0.5 to 2.3 um. It was found that, at all cobalt ...Read more
Author:Kumpaty, S; Coen, B; Coen, L; Tlotleng, Monnamme; Arthur, Nana KK; Pityana, Sisa LDate:Nov 2021Ti-6Al-4V is a common alloy known for its use in aerospace and/or biomedical applications. In this study, Mo has been employed to increase the biocompatibility of Ti-6Al-4V. Two samples of Ti-6Al-4V with layers of differing percentages of Mo ...Read more
Author:Milman, YV; Chugunova, S; Goncharuck, V; Luyckx, S; Northrop, ITDate:1997The paper reports hardness measurements on WC-6 wt%Co of three different grain sizes in the temperature range from -196 to 900 degrees C. Coarser grades have been found to soften with increasing temperature at a higher rate than finer grades. ...Read more
Author:Osborne, C; Cornish, L; Luyckx, SDate:1997The aim of this work was to produce V8C7-WC and V4C3-WC powders with grain size between 1 and 2mu-m, as a first stage of the preparation of fine grained WC-VC-Co hardmetal. V8C7-WC powder was produced via two routes: starting from preformed ...Read more
Author:Nabarro, FRNDate:2003The analysis of thermal activation under shear stress in three- and even two-dimensional models presents unresolved problems. The analysis of one-dimensional models presented here may illuminate the study of more realistic models. For the ...Read more
Author:Nabarro, FRNDate:Mar 1997The Peierls stress is the stress required to move a dislocation through a perfect crystal lattice. Theoretical estimates show an exponential dependence on the ratio of the spacing between gliding planes and the unit slip distance. Nabarro ...Read more