Influence of Glide Dislocation Motion on Self-Diffusion in b.c.c. Fe. A Molecular Dynamics Study

Abstract

The interaction of glide dislocations with own interstitial atoms in α-Fe is studied. As a method of investigation the molecular dynamics simulation is used. The modelled sample is deformed with a rate close to the deformation rates under pulsed laser treatment. Mass transfer parameter for b.c.c. Fe under laser pulse irradiation is calculated. As established, the core of moving dislocation is a trap for interstitial atom. The influence of temperature and deformation rate on mass-transfer coefficient is studied.

Mechanism of Diffusion-Zone Formation at the Al–Fe Phase Interface under Impact-Loading Conditions

“…Moreover, plastic deformation in modelled samples promotes the mutual migration of atoms on the phase interfaces. Defects, especially dislocations, occurring on phase interfaces, help to transfer diffused (interstitial) atoms into the volume of material in the way described in [5,6].…”

“…As shown, the surface alloying takes place by iron cladding on the aluminium-based specimen in the process of ultrasonic impact loading [4]. Impact treatment provides defect formation and atom migration on the phase interface and those atom-transfer processes are mechanically activated, as mechanical activated diffusion described in [5][6][7].…”