ISSN 1062-8738, Bulletin of the Russian Academy of Sciences. Physics, 2014, Vol. 78, No. 4, pp. 330–332. © Allerton Press, Inc., 2014. Original Russian Text © R.B. Abylkalykova, A.V. Dzhes, L.I. Kveglis, F.M. Noskov, M.N. Volochaev, A.G. Cherkov, 2014, published in Izvestiya Rossiiskoi Akademii Nauk. Seriya Fizicheskaya, 2014, Vol. 78, No. 4, pp. 504–507. 330 INTRODUCTION Fe 86 Mn 13 C alloy is known as Hadfield steel and is widely used in industry and machine building due to its low cost. This alloy is known as an antiferromagnetic invar [1]. Due to the spontaneously appearing regular com- position of structures of antiferromagnetic austenite and ferromagnetic deformation martensite, it can have unique mechanical, electrical, thermal, and magnetic properties [2, 3]. Thin-film samples of the Fe 86 Mn 13 C alloy can be used as materials for spintronics. The aim of this work was to investigate features of martensite transformation and the magnetic structure formed during plastic deformation in bulk and thin- film alloy samples. EXPERIMENTAL Thin discs of Fe 86 Mn 13 C alloy, cut from bulk sam- ples using the electric spark method, were thinned by jet polishing. Films of the same alloy were obtained via thermal deposition on NaCl substrates and coating glass at a rarefaction of 10 –5 mm Hg in a VUP-4 vacuum instal- lation. Internal stresses and deformations in film and bulk samples were induced through their multiple immer- sion into liquid nitrogen, due to the strong tempera- ture gradient. Thinned bulk and film samples were investigated via electron microscopy on JEOL-2010, JEOL-2100, and EM-200 electron microscopes. Lorenz contrast was obtained in the EM-200 electron microscope in the mode of an active and inactive objective lens. RESULTS AND DISCUSSION Figure 1 shows the electron microscopy image of a thin disc of Fe 86 Mn 13 C alloy subjected to cryomechan- ical treatment in liquid nitrogen. Localization plastic deformation zones ~1 nanometer thick can be seen. Similar plastic deformation zones were discussed in [4], where a schematic of the reorientation of nanos- trips in a nickel submicrocrystal after torsion plastic Investigating Deformation Martensite in Thinned Samples and Films of Fe 86 Mn 13 C Alloy R. B. Abylkalykova a , A. V. Dzhes b , L. I. Kveglis c , F. M. Noskov c , M. N. Volochaev d , and A. G. Cherkov e a East Kazakhstan State University, Ust’-Kamenogorsk, 070020 Kazakhstan b East Kazakhstan State Technical University, Ust’-Kamenogorsk, 070004 Kazakhstan c Siberian Federal University, Krasnoyarsk, 660041 Russia d Siberian State Aerospace University, Krasnoyarsk, 660014 Russia e National Research University, Novosibirsk, 630090 Russia e-mail: kveglis@iph.krasn.ru Abstract—The structure and properties of film and bulk samples of Fe 86 Mn 13 C alloy are investigated exper- imentally. The formation of the deformation martensite structure in Fe 86 Mn 13 C alloy is described in terms of cluster models of FCC and BCC structures. DOI: 10.3103/S1062873814040030 10 nm Fig. 1. Electron microscopy high-resolution image of a thinned sample of Fe 86 Mn 13 C alloy subjected to cryome- chanical treatment.