Physical Mesomechanics. Vol. 27, No. 6, Pages 710-724, 2024

O. V. Rybalchenko^a^,*, N. S. Martynenko^a, G. V. Rybalchenko^b, E. A. Lukyanova^a, V. S. Komarov^{a, c}, M. A. Kaplan^a, A. N. Belyakov^d, P. D. Dolzhenko^d, I. V. Shchetinin^c, A. G. Raab^e, S. V. Dobatkin^a, and S. D. Prokoshkin^c

^aBaikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow, 119334 Russia

^bLebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia

^cNational University of Science and Technology “MISIS”, Moscow, 119049 Russia

^eInstitute of Molecule and Crystal Physics, Ufa Federal Research Center, Russian Academy of Sciences, Ufa, 450075 Russia

Abstract— This work examines the possibility of regulating the corrosion rate of Fe-Mn-Si alloys by modifying their structure via equal channel angular pressing. It is found that the formed ultrafine-grained austenitic structure of Fe-Mn-Si alloys leads to a significant increase in strength characteristics at satisfactory ductility. The presence of special twin boundaries in the structure of Fe-Mn-Si alloys improves their corrosion resistance, while a predominantly grain-subgrain structure in the absence of twin boundaries increases the corrosion rate up to 0.4 mm/year. The shape memory effect in the studied alloys manifests itself at temperatures unacceptable for medical use. Structure refinement by equal channel angular pressing in modes that ensure a completely austenitic state leads to a decrease in shape memory properties.

Keywords: Fe-Mn-Si alloys, equal channel angular pressing, shape memory effect, microstructure, microhardness, mechanical properties, corrosion rate

Functional and Mechanical Characteristics of Ultrafine-Grained Fe-Mn-Si Alloys for Biomedical Applications