The work is devoted to a study of the structure and mechanical properties of two nonequiatomic medium-entropy nanocrystalline alloys, in which in a coarse state additional mechanisms act during plastic deformation — twinning (TWIP) in the alloy and phase transformations (TRIP) in the alloy. The nanocrystalline state in these alloys is achieved by high-pressure torsion (HPT) at 300 K and 77 K after different numbers of revolutions n = 0.25 and 5. In the nanostructural state in the TWIP and the TRIP alloys, a basically complete phase transition from the fcc lattice to hcp is observed, the content of which does not depend very strongly on the HPT temperature and deformation. For both alloys in the nanostructured state, there is a significant decrease in differences in the phase composition and microhardness Hv by comparison with the coarse-grained state. A decrease in the HPT temperature and an increase in HPT deformation for all the cases studied lead to an increase in the value of Hv. The TWIP alloy remains ductile under active compression deformation at 300 and 77 K, while there is no macroscopic plasticity in the TRIP alloy under similar conditions. For the TWIP the thermally-activated character of plastic deformation is retained during the transition from the coarse-grained to the nanostructured state.
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Structure and cryogenic mechanical properties of severely deformed nonequiatomic alloys of Fe–Mn–Co–Cr system
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November 2023
Research Article|
November 01 2023
Structure and cryogenic mechanical properties of severely deformed nonequiatomic alloys of Fe–Mn–Co–Cr system
E. D. Tabachnikova;
E. D. Tabachnikova
a)
1
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103
, Ukraine
a)Author to whom correspondence should be addressed: tabachnikova@ilt.kharkov.ua
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T. V. Hryhorova;
T. V. Hryhorova
1
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103
, Ukraine
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S. N. Smirnov;
S. N. Smirnov
1
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103
, Ukraine
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I. V. Kolodiy;
I. V. Kolodiy
2
National Science Center Kharkiv Institute of Physics and Technology
, Kharkiv 61108, Ukraine
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Yu. O. Shapovalov;
Yu. O. Shapovalov
1
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103
, Ukraine
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A. V. Levenets;
A. V. Levenets
2
National Science Center Kharkiv Institute of Physics and Technology
, Kharkiv 61108, Ukraine
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S. E. Shumilin;
S. E. Shumilin
1
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103
, Ukraine
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I. V. Kashuba;
I. V. Kashuba
1
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103
, Ukraine
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M. A. Tikhonovsky;
M. A. Tikhonovsky
2
National Science Center Kharkiv Institute of Physics and Technology
, Kharkiv 61108, Ukraine
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F. Spieckermann;
F. Spieckermann
3
Department of Materials Science
, Chair of Materials Physics, Montanuniversität Leoben
, Leoben 8700, Austria
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M. J. Zehetbauer;
M. J. Zehetbauer
4
Faculty of Physics, University of Vienna
, Wien 1090, Austria
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E. Schafler;
E. Schafler
4
Faculty of Physics, University of Vienna
, Wien 1090, Austria
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Y. Huang;
Y. Huang
5
Department of Design and Engineering, Faculty of Science and Technology, Bournemouth University Poole
, Dorset BH12 5BB, UK
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T. G. Langdon
T. G. Langdon
6
Department of Mechanical Engineering, University of Southampton
, Southampton SO17 1BJ, UK
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a)Author to whom correspondence should be addressed: tabachnikova@ilt.kharkov.ua
Fiz. Nizk. Temp. 49, 1423–1434 (November 2023)
Low Temp. Phys. 49, 1294–1305 (2023)
Article history
Received:
September 27 2023
Citation
E. D. Tabachnikova, T. V. Hryhorova, S. N. Smirnov, I. V. Kolodiy, Yu. O. Shapovalov, A. V. Levenets, S. E. Shumilin, I. V. Kashuba, M. A. Tikhonovsky, F. Spieckermann, M. J. Zehetbauer, E. Schafler, Y. Huang, T. G. Langdon; Structure and cryogenic mechanical properties of severely deformed nonequiatomic alloys of Fe–Mn–Co–Cr system. Low Temp. Phys. 1 November 2023; 49 (11): 1294–1305. https://doi.org/10.1063/10.0021377
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