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Dislocation-solute interaction plays fundamental roles in mechanicalproperties of alloys. Here, we disclose the essential features ofdislocation-carbon interaction in austenitic Fe at the atomistic scale. We showthat passage of a Shockley partial dislocation in face-centered cubic iron isable to move carbon atoms on the slip plane forward by one Burgers vector,revealing a novel dissociated dislocation-mediated transport mechanism. Thismechanism is induced by shear, which is distinct from the normal thermallyactivated diffusion process. Furthermore, we show that there exists a fastdiffusion channel with significantly reduced diffusion energy barrier in thepartial dislocation core, which is highly localized and directional. Theseinherent geometrical features are crucial for understanding the dependence ofthe diffusivity of dislocation pipe diffusion on the character of dislocations;most importantly, they can result in unbalanced pinning effect on the leadingand trailing partials in a mixed dislocation, consequently facilitatingstacking fault formation and deformation twinning. This explains thecontroversial effects of carbon on deformation twinning observed in variousalloys. Our findings pave the road to tune mechanical properties of materialsby manipulating dislocation-interstitial interaction.

Dissociated dislocation-mediated carbon transport and diffusion in austenitic iron