Plasticity of an extra-strong nanocrystalline stainless steel controlled by the “dislocation-segregation” interaction

N.A. A Enikeev (1) , I.V. V Lomakin (2) , M.M. M Abramova (1) , A.M. M Mavlyutov (3) , A.A. A Lukyanchuk (4) , A.S. S Shutov (4) , Xavier Sauvage (5)

1 USATU - Ufa State Aviation Technical University
2 Department of Applied Physics [Aalto]
3 Saint Petersburg State University [Saint Petersburg, Russian Federation]
4 NRC KI - National Research Center "Kurchatov Institute"
5 GPM - Groupe de physique des matériaux

We study three structurally different states of nanocrystalline 316 steel and show that the state, where boundaries containing excess concentration of alloying elements are combined with mobile dislocations in grain interiors, allows maintaining extraordinarily high strength and remarkably enhanced plasticity. Underlying mechanisms featuring interaction between the segregations and mobile dislocations are discussed.

Mots clés: Nanostructured materials; stainless steels; plasticity; grain boundary; segregation; deformation mechanisms

Domaines: Science des matériaux [cond-mat.mtrl-sci]

N.A. A Enikeev, I.V. V Lomakin, M.M. M Abramova, A.M. M Mavlyutov, A.A. A Lukyanchuk, et al.. Plasticity of an extra-strong nanocrystalline stainless steel controlled by the “dislocation-segregation” interaction. Materials Letters, 2021, 301, pp.130235. ⟨10.1016/j.matlet.2021.130235⟩. ⟨hal-03262983⟩