Planar slip

For interactions between two quadmpolar molecules which have and 0g of the same sign, at a fixed separation r, the angular factor in equation (Al.5.131 leads to a planar, T-shaped stmcture, 0 = 0, 0g = nil, (ji = 0, being preferred. This geometry is often seen for nearly spherical quadmpolar molecules. There are other planar (ij) = 0) configurations with 0 = jr/2-6g that are also attractive. A planar, slipped parallel stmcture,... 

In this study, the appearance and evolution sequence of planar slip bands, in addition to a dislocation cell structure with increasing e,, is identical to that observed in quasi-static studies of the effects of stress path changes on dislocation substructure development [27]. The substructure evolution in copper deformed quasi-statically is known to be influenced by changes in stress path [27]. Deforming a sample in tension at 90° orthogonal to the... 

V. Gerold andH.P. Kamthaler, On the origin of planar slip inf.c.c. Mays, Acta Metall. 37 2177 (1989). 

Planar slip is favored by hydrogen-dislocations interactions. This is quite important when applied to SCC analysis, as will be discussed in Sec. 5.5.5. 

Other hydrogen-dislocation interactions at the corrosion fatigue crack tip must be taken into account. One can show, for instance, that hydrogen promotes planar slip in fee materials. Cross-slip ability can be discussed for the peculiar situation of the dissociation of a perfect screw dislocation into two mixed partials separated by a stacking fault ribbon (Fig. 20). The cross-slip probability depends on the work necessary for recombination. 

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