Unknown

Dataset Information

0

"Conjugate channeling" effect in dislocation core diffusion: carbon transport in dislocated BCC iron.


ABSTRACT: Dislocation pipe diffusion seems to be a well-established phenomenon. Here we demonstrate an unexpected effect, that the migration of interstitials such as carbon in iron may be accelerated not in the dislocation line direction ξ, but in a conjugate diffusion direction. This accelerated random walk arises from a simple crystallographic channeling effect. c is a function of the Burgers vector b, but not ξ, thus a dislocation loop possesses the same everywhere. Using molecular dynamics and accelerated dynamics simulations, we further show that such dislocation-core-coupled carbon diffusion in iron has temperature-dependent activation enthalpy like a fragile glass. The 71° mixed dislocation is the only case in which we see straightforward pipe diffusion that does not depend on dislocation mobility.

SUBMITTER: Ishii A 

PROVIDER: S-EPMC3623912 | biostudies-literature |

REPOSITORIES: biostudies-literature

Similar Datasets

| S-EPMC6240105 | biostudies-literature
| S-EPMC7801622 | biostudies-literature
| S-EPMC4894953 | biostudies-literature
| S-EPMC6356427 | biostudies-literature
| S-EPMC7287698 | biostudies-literature
| S-EPMC8516984 | biostudies-literature
| S-EPMC7547675 | biostudies-literature
| S-EPMC7642400 | biostudies-literature
| S-EPMC9079903 | biostudies-literature
| S-EPMC7429499 | biostudies-literature