炭素の拡散によってNi単結晶に形成される転位組織

抄録

The dislocation structure resulting from the diffusion of interstitial carbon in nickel single crystals has been studied by means of electron microscopy. The randomly distributed dislocations accommodating the lattice parameter gradients are observed in the diffusion zone. The results of Burgers vector determination have revealed that a great part of dislocations and their Burgers vectors exist on slip planes. The dislocation structure is quite different from that in substitutional diffusion. This difference is associated with the mechanism of dislocation motion at the diffusion temperature. In the case of interstitial diffusion, the dislocations are likely to transfer by the glide mechanism in the early stages of diffusion. Detailed studies on the change in dislocation structure with diffusing time have made it clear that the annihilation of the dislocations does not occur immediately after the disappearance of the concentration gradient.