Suppement Movie

Atomic arrangement of the surface diffusion along the minimum energy pat

Temperature dependence of carbon diffusivity, in -iron.

<p>MD and accelerated MD (AB) <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0060586#pone.0060586-Ishii1" target="_blank">[14]</a> results are displayed with filled and open symbols, respectively. One-carbon diffusivity results in bulk lattice, in fixed edge dislocation core, in free edge dislocation core are displayed with circles, squares, and triangles, respectively. Two-carbon diffusivity result in free dislocation are displayed with diamonds. The lines are polynomial fits as guide to the eye.</p

Temperature dependence of (a) activation enthalpy and (b) activation entropy of one-carbon diffusivity in free edge dislocation core.

<p>Temperature dependence of (a) activation enthalpy and (b) activation entropy of one-carbon diffusivity in free edge dislocation core.</p

Geometries of (a) curved dislocation core, (b) screw dislocation core, and (c) 71° mixed dislocation core along .

<p>Blue and green dots indicate the atoms on th and +1th planes, respectively. Black lines are the eye guides for the dislocation cores. Red dashed lines indicate the conjugate diffusion avenue along in the dislocation core, a channel as wide as possible ( is one of the two widest avenues on a plane) and as tall as possible (a full interplanar spacing) in a BCC crystal.</p

Illustration of conjugate channeling effect in dislocation core diffusion.

<p>Black arrows indicate the carbon diffusion path through bulk lattice (O-site) along and black dots indicate the O-site along the path. Red arrows indicate the carbon diffusion path through dislocation core along . is the maximum dislocation core length which can be dragged by single carbon atom (See text for details). The dislocation loop is located between th and +1th plane as shown in upper right figure. Lower right figure show the relation between conjugate diffusion vector <b><i>c</i></b> and Burgers vector <b><i>b</i></b>.</p