Dislocation Distribution near the Surface of Weakly Deformed Copper Crystals

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Investigations were made on the dislocation distribution near the crystal surface parallel to the cross slip plane of weakly deformed copper single crystals whose axial orientations lie on the great circle, ⟨110⟩–⟨112⟩, using an etch pit technique. The dislocation density was highest at the crystal surface. It rapidly decreased near the crystal surface (surface hardened layer) and then gradually in the interior with the distance from the crystal surface. The surface hardened layers in two crystals which were led just to the yielding point and elongated up to the intermediate stage of the easy glide region were 40 and 70μ in thickness, respectively.<BR>Two kinds of dislocation distribution were observed near the surface; (1) long and straight dislocation arrangements in a row along the primary slip trace and (2) rather randomly distributed dislocations between the rows of (1). With increasing depth toward the interior, however, the former changed to dislocation bands and the latter disappeared.<BR>It was concluded that the high dislocation density near the crystal surface of weakly deformed copper came from the preferential activation of the surface sources not only of the primary but of the latent slip system.

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