Danilchenko Vitaliy E, Mazanko Vladimir F, Filatov Alexander V, Iakovlev Viktor E
G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, Vernadsky Blvd. 36, Kyiv, 03142 Ukraine.
Nanoscale Res Lett. 2015 Apr 14;10:178. doi: 10.1186/s11671-015-0884-5. eCollection 2015.
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.
采用放射性同位素法研究了经相硬化处理的Fe-18wt.%Mn-2wt.%Si合金中钴原子的扩散特性。观察到在循环γ-ε-γ马氏体转变下钴原子扩散系数显著增加，这是由于两种独立机制的作用——一种是无热机制，另一种是热激活机制。第一种机制源于在交变应力和同时进行的晶格重构过程中，伴随着相应的正向和反向晶格切变，发生的直接γ-ε和反向ε-γ转变。另一种机制则在相硬化合金的扩散退火过程中出现。
