A study was made of the dislocation structures which were generated by compressive strains at room temperature or 650C in a polycrystalline orthorhombic phase. Slip was found to occur on [100](001), with cross-slip onto (041), and on ½[110](1¯10) or (001), or on the pyramidal system, ½[114] or [102],(22¯1). Only dissociation into super-partials was observed for all of the dislocations. The dislocation distribution was dominated by the junctions of [100] and ½[110]-type dislocations and by the planar slip bands of <c+a/2> dislocations. The constituent super-partials of <c+a/2> dislocations were pinned at room temperature, due to interactions with <a> dislocations, but these locks were not seen at high temperatures.

D.Banerjee: Philosophical Magazine A, 1995, 72[6], 1559-87