Application of combined load for obtaining ultra-fine grained structure in magnetic alloys of the Fe-Cr-Co system

  • Galiya Korznikova Institute for Metals Superplasticity Problems, Russian Academy of Science, Russian Federation
  • Anna Korneva Institute of Metallurgy and Materials Science, Polish Academy of Sciences, Poland
  • Elena Korznikova Institute for Metals Superplasticity Problems, Russian Academy of Science, Russian Federation
Keywords: Magnetic properties, mechanical properties, ternary systems, severe plastic deformation, gradient structures


Fe-Cr-Co system magnets are known for their high remanence and maximum energy product along with high mechanical properties. However, since the thermomagnetic treatment of the alloy implies the spinodal decomposition, which in turn drops the ductility of the material, finding a balance of magnetic and mechanical properties is in focus of many scientist due to its relevance. One of possible paths for finding this balance is application of hot deformation approach. The processes of dynamic recrystallization during hot deformation by means of compression accompanied torsion of magnetic alloys Fe-25%Cr-15%Co and Fe-30%Cr-8%Co of Fe-Cr-Co ternary system were studied. It is shown that the chosen method of deformation can be effectively applied to receive ultrafine-grained structure in the vicinity of the deformation zones and obtaining the gradient type structure in considered alloys. Founding on the analysis of results obtained, basic principles for enhancement of the alloy properties during thermomechanical treatment were figured out. Specific values of strain temperature and velocity for both considered alloys were proposed.


Akbar, S., Awan, M. S., Aleem, M. A., & Sarwar, M. N. (2014). Development of Mo Containing Fe-Cr-Co Permanent Magnets by Modified Single Step Thermomagnetic Treatment. IEEE Transactions on Magnetics, 50(8). Scopus.

Altafi, M., Ghasemi, A., & Sharifi, E. M. (2019). The influence of cold rolling and thermomagnetic treatment on the magnetic and mechanical properties of Fe-23Cr-9Co alloy. Journal of Magnetism and Magnetic Materials, 491. Scopus.

Delette, G. (2015). Polycrystalline models of anisotropic sintered magnets: Influence of grain alignment on mechanical properties and residual stresses. Journal of Magnetism and Magnetic Materials, 389, 10–20.

Garganeev, A. G., Kyui, D. K., Kashin, E. I., & Sipaylova, N. Y. (2018). Regulation Characteristics of Hysteresis Clutches Based on the Fe-Cr-Co Material. 115–118. Scopus.

Herzer, G. (2013). Modern soft magnets: Amorphous and nanocrystalline materials. Acta Materialia, 61(3), 718–734.

Hilzinger, R., & Rodewald, W. (2013). Magnetic materials: Fundamentals, products, properties, and applications. Publicis ; VAC, VACUUMSCHMELZE.

Jia, X., Dai, R., Lian, D., Han, S., Wu, X., & Song, H. (2017). Facile synthesis and enhanced magnetic, photocatalytic properties of one-dimensional Ag@Fe3O4-TiO2. Applied Surface Science, 392, 268–276.

Kawasaki, M., Figueiredo, R. B., & Zhilyaev, A. P. (2020). Special Issue Celebrating Professor Terence G. Langdon’s 80th Birthday. Advanced Engineering Materials, 22(1), 1901386.

Korneva, A., Korznikova, G., Kashaev, R., & Straumal, B. (2019). Microstructure evolution and some properties of hard magnetic FeCr30Co8 alloy subjected to torsion combined with tension. Materials, 12(18). Scopus.

Korneva, A., Korznikova, G., Korznikov, A., & Sztwiertnia, K. (2013). Effect of deformation temperature on the microstructure of hard magnetic FeCr22Col5 alloy subjected to tension combined with torsion deformation modes. Archives of Metallurgy and Materials, 58(2), 383–386. Scopus.

Korneva, Anna, Korznikova, G., Kashaev, R., & Straumal, B. (2019). Microstructure Evolution and Some Properties of Hard Magnetic FeCr30Co8 Alloy Subjected to Torsion Combined with Tension. Materials, 12(18), 3019.

Korznikov, A. V., & Korznikova, G. F. (2017). Influence of the structure on the deformation ability of the Fe-Cr-Co system alloys. Materials Physics and Mechanics, 33(1), 104–112. Scopus.

Korznikova, E., Schafler, E., Steiner, G., & Zehetbauer, M. J. (2006). Measurements of vacancy type defects in SPD deformed Ni. By YT Zhu, TG Langdon, Z. Horita, MJ Zehetbauer, SL Semiatin, TC Lowe.-Warrendate, PA: The Minerals, Metals & Materials Society (TMS), 97–102.

Korznikova, G. F., & Korznikov, A. V. (2009). Gradient submicrocrystalline structure in Fe–Cr–Co system hard magnetic alloys. Materials Science and Engineering: A, 503(1–2), 99–102.

Li, N., Jiang, H.-L., Wang, X., Wang, X., Xu, G., Zhang, B., Wang, L., Zhao, R.-S., & Lin, J.-M. (2018). Recent advances in graphene-based magnetic composites for magnetic solid-phase extraction. TrAC Trends in Analytical Chemistry, 102, 60–74.

Li, P., Wang, A., & Liu, C. T. (2017). A ductile high entropy alloy with attractive magnetic properties. Journal of Alloys and Compounds, 694, 55–60.

Luo, D., Wu, C., & Yan, M. (2018). Incorporation of the Fe3O4 and SiO2 nanoparticles in epoxy-modified silicone resin as the coating for soft magnetic composites with enhanced performance. Journal of Magnetism and Magnetic Materials, 452, 5–9.

Panin, V. E., Kuznetsov, P. V., & Rakhmatulina, T. V. (2018). Lattice Curvature and Mesoscopic Strain-Induced Defects as the Basis of Plastic Deformation in Ultrafine-Grained Metals. Physical Mesomechanics, 21(5), 411–418.

Wang, Y., & Weng, G. J. (2016). On Eshelby’s S-tensor under various magneto-electro-elastic constitutive settings, and its application to multiferroic composites. Journal of Micromechanics and Molecular Physics, 01(03n04), 1640002.

Xiao, L., Sun, Y., Ding, C., Yang, L., & Yu, L. (2014). Annealing effects on magnetic properties and strength of organic-silicon epoxy resin-coated soft magnetic composites. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 228(12), 2049–2058.

Zhang, J., Chang, C., Wang, A., & Shen, B. (2012). Development of quaternary Fe-based bulk metallic glasses with high saturation magnetization above 1.6T. Journal of Non-Crystalline Solids, 358(12–13), 1443–1446.

Zhang, Y., Zuo, T. T., Tang, Z., Gao, M. C., Dahmen, K. A., Liaw, P. K., & Lu, Z. P. (2014). Microstructures and properties of high-entropy alloys. Progress in Materials Science, 61, 1–93.

Zhilyaev, A., & Langdon, T. (2008). Using high-pressure torsion for metal processing: Fundamentals and applications. Progress in Materials Science, 53(6), 893–979.

How to Cite
Korznikova, G., Korneva, A., & Korznikova, E. (2020). Application of combined load for obtaining ultra-fine grained structure in magnetic alloys of the Fe-Cr-Co system. Reports in Mechanical Engineering, 1(1), 1-9.