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4 results on '"K. A. Kozlov"'

1. Formation of low-temperature deformation-induced segregations of nickel in Fe–Ni-based austenitic alloys

Author

V. V. Makarov, K. A. Kozlov, V. V. Sagaradze, V. A. Zavalishin, A. R. Kuznetsov, N. V. Kataeva, Yu. M. Ustyugov, and S. V. Rogozhkin

Subjects
010302 applied physics, Austenite, Materials science, Metallurgy, technology, industry, and agriculture, chemistry.chemical_element, 02 engineering and technology, Deformation (meteorology), equipment and supplies, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, law.invention, Nickel, chemistry, law, 0103 physical sciences, Electron microscope, 0210 nano-technology
Abstract

The authors present the results of an investigation in Fe–Ni-Cr austenitic alloys of the low-temperature deformation-induced segregations of nickel that form in the micro regions being (i) located ...

Published
2020
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2. The short-range clustering in Fe–Cr alloys enhanced by severe plastic deformation and electron irradiation

Author

K. A. Kozlov, A. E. Zamatovskii, V. A. Shabashov, Alexander L. Nikolaev, E. G. Novikov, V. V. Sagaradze, and K. A. Lyashkov

Subjects
010302 applied physics, Materials science, Torsion (mechanics), 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Crystallographic defect, 0103 physical sciences, Mössbauer spectroscopy, Electron beam processing, Irradiation, Composite material, Severe plastic deformation, 0210 nano-technology, Cluster analysis, Ball mill
Abstract

The short-range clustering enhanced by migration of non-equilibrium point defects generated under the high-pressure torsion in Bridgman anvils and ball milling is detected by means of Mossb...

Published
2019
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3. Short-range order clustering in BCC Fe–Mn alloys induced by severe plastic deformation

Author

K. A. Kozlov, Alexander L. Nikolaev, V. V. Sagaradze, V. I. Voronin, V. A. Shabashov, K. A. Lyashkov, and V. A. Semyonkin

Subjects
010302 applied physics, Materials science, Thermodynamics, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 0103 physical sciences, Mössbauer spectroscopy, Short range order, Severe plastic deformation, 0210 nano-technology, Ball mill, Proto-oncogene tyrosine-protein kinase Src
Abstract

The effect of severe plastic deformation, namely, high-pressure torsion (HPT) at different temperatures and ball milling (BM) at different time intervals, has been investigated by means of Mossbauer spectroscopy in Fe100–xMnx (x = 4.1, 6.8, 9) alloys. Deformation affects the short-range clustering (SRC) in BCC lattice. Two processes occur: destruction of SRC by moving dislocations and enhancement of the SRC by migration of non-equilibrium defects. Destruction of SRC prevails during HPT at 80–293 K; whereas enhancement of SRC dominates at 473–573 K. BM starts enhancing the SRC formation at as low as 293 K due to local heating at impacts. The efficiency of HPT in terms of enhancing SRC increases with increasing temperature. The authors suppose that at low temperatures, a significant fraction of vacancies are excluded from enhancing SRC because of formation of mobile bi- and tri-vacancies having low efficiency of enhancing SRC as compared to that of mono vacancies. Milling of BCC Fe100–xMnx alloys st...

Published
2017
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4. Deformation-induced dissolution of the intermetallics Ni3Ti and Ni3Al in austenitic steels at cryogenic temperatures

Author

V. A. Shabashov, V. A. Zavalishin, A. V. Litvinov, A. R. Kuznetsov, V. P. Pilyugin, K. A. Kozlov, V. V. Sagaradze, and N. V. Kataeva

Subjects
010302 applied physics, Austenite, Materials science, Metallurgy, Intermetallic, Torsion (mechanics), 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Crystallographic defect, Stress field, Condensed Matter::Materials Science, High pressure, 0103 physical sciences, Mössbauer spectroscopy, 0210 nano-technology, Dissolution
Abstract

An anomalous deformation-induced dissolution of the intermetallics Ni3Al and Ni3Ti in the matrix of austenitic Fe–Ni–Al(Ti) alloys has been revealed in experiment at cryogenic temperatures (down to 77 K) under rolling and high pressure torsion. The observed phenomenon is explained as the result of migration of deformation-stipulated interstitial atoms from a particle into the matrix in the stress field of moving dislocations. With increasing the temperature of deformation, the dissolution is replaced by the deformation-induced precipitation of the intermetallics, which is accelerated due to a sufficient amount of point defects in the matrix, gained as well in the course of deformation at lower temperatures.

Published
2016
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