Surface effects in plastic deformation of metals

Fundamental aspects of dislocation theory

“…Avalanche behavior in glide band formation is found in many crystal structures and is characteristic of low strain-rates when a single slip system operates. First reported by Joffe [125] in NaCl and zinc crystals, it has since been established for insulators [125][126][127]68, 69], metals [128][129][130][131][132][133][134][135][136]. and semiconductors [81], by independent and combinations of studies of (i) slip lines [128][129][130][131][132][133].…”

“…The y ," values are listed in table 4. Both partials are glissile on the (131) cross slip plane. This dissociation becomes more favorable in higher {111}…”

Study of the effect of coherent precipitates on the surface topography produced by deformation of copper--2 wt. % cobalt alloy single crystals

“…Brown (35) has proposed an alternative mechanism for the origin of lamellar slip. An avalanche of dislocations is started when the applied stress is sufficient to set off some given below:…”

“…In the latter case the strains interfered with the cross-slip mechanism of slip band formation.H. Theories of Slip-Band FormationSeveral theories(34,35,39,(44)(45)(46).have been proposed to account for slip band formation. All theories,in general, consider multiplication of dislocations and their propagation.According toCottrell (44) once the-stress is sufficient to start a Frank-Read source, dislocations move towards the surface.…”

A study of the effect of coherent precipitates on the surface topography produced by deformation of copper-2 wt. % cobalt alloy single crystals

“…A dislocation model to account for the observed surface topology is proposed. Brown (35) observed that the slip bands on all metals increase in number but the lamellae which make up the bands do not apparently change with strain or strain rate. J. T. This prevented solution from creeping onto the sides of the specimen so that a good edge was maintained during polishing.…”