title: The effect of cyclic martensitic transformations on diffusion of cobalt atoms in Fe-18wt.%Mn-2wt.%Si alloy.
abstract: Diffusion characteristics of cobalt atoms were investigated using radioactive isotope method in phase-hardened Fe-18wt.%Mn-2wt.%Si alloy. The observed significant increase of diffusion coefficient of cobalt atoms under the cyclic γ-ε-γ martensitic transformations was due to the action of two independent mechanisms - an athermal one and a thermally activated one. The first one arose from the direct γ-ε and the reverse ε-γ transformations with corresponding direct and reverse lattice shears during alternating stresses and simultaneous lattice restructuring. Another mechanism arose under the diffusion annealing of the phase-hardened alloy.
authors.affiliation: G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, Vernadsky Blvd. 36, Kyiv, 03142 Ukraine.
authors.forename: Vitaliy E
authors.initials: VE
authors.lastname: Danilchenko
authors.affiliation: G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, Vernadsky Blvd. 36, Kyiv, 03142 Ukraine.
authors.forename: Vladimir F
authors.initials: VF
authors.lastname: Mazanko
authors.affiliation: G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, Vernadsky Blvd. 36, Kyiv, 03142 Ukraine.
authors.forename: Alexander V
authors.initials: AV
authors.lastname: Filatov
authors.affiliation: G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, Vernadsky Blvd. 36, Kyiv, 03142 Ukraine.
authors.forename: Viktor E
authors.initials: VE
authors.lastname: Iakovlev
keywords: Diffusion; Dislocations density; Martensitic transformation; Packing defects; Phase hardening