Physico-Chemical nanomaterials science

Dislocation-enhanced diffusion in cubic metals at nanoscale level
Soldatenko O.M.1,2, Filatov O.V.1,2
1 Physics of Atomic Transport Processes Department, G.V. Kurdyumov Institute for Metal Physics of the NAS of Ukraine. Academician Vernadsky Boulevard, 36, Kyiv-03142, Ukraine. 
E-mail: oksana.hubina2811@gmail.com

2 Metal Physics Department, Faculty of Physical engineering, National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”. Prosp. Peremohy, 37, Kyiv-03056, Ukraine.

A large number of defects occur in metals under pulse deformation and it can cause an activation of mass-transfer processes in the near-surface layers exposed to impulse. In this case, mass-transfer processes are mechanical activated and the influence of temperature is not significant [1]. 
For example, mechanical activated diffusion is significant in a case of ultra-sonic treatment of aluminum alloy by the pin of Armco-Fe. At first, the Fe alloyed layer occurs at the surface of aluminum alloy. Then a diffusion zone forms in a near-surface layer, and the thickness of this zone increases with the increasing of treatment time. Two times increasing of treatment time increases the thickness of the diffusion zone 1.5 times. The formation of the diffusion zone is a result of mechanical activated mass transfer.
The mechanism of mass-transfer under impulse loading can be described by the formation of glide dislocations and interstitial atoms and their interaction in the near-surface layers in the process of deformation. This is one of the mechanisms of enhanced diffusion in cubic metals studied by the molecular dynamics method.

1.	Filatov O.V., Soldatenko O.M. Influence of Glide Dislocation Motion on Self-Diffusion in b.c.c. Fe. A Molecular Dynamics Study // Metallofiz. Noveishie Tekhnol.-2020.-42, N 1.-P. 1–9. DOI: 10.15407/mfint.42.01.0001.