Diffusion drift paths in the core region of an edge dislocation

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Abstract
Using the Johnson potential, the atomic configurations around perfect dislocations with 〈100〉Burgers vector in Ni and γ‐Fe were calculated using the relaxation procedure of Bullough and Perrin. Johnson's carbon–metal potential was used to calculate paths of maximum energy gain between octahedral sites. Four rows of sinks were found, in regions where the shear stress, the compressional and dilational stress predominate. Around each sink is a region draining into it. The binding energy of the C‐atom is strongest for the dilational sink: 0.21 and 0.11 eV for Ni and γ‐Fe, respectively. The imperfect 1/2 〈100〉 dislocation, which is a Frank partial, was also investigated for Ni. The binding energy of the C‐atom to the stacking fault sites is 0.74 eV (Suzuki effect).
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