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Materials, volume 14, issue 24, pages 7762

Structure of Alloys for (Sm,Zr)(Co,Cu,Fe)z Permanent Magnets: III. Matrix and Phases of the High-Coercivity State

Dormidontov Andrey G ¹

Kolchugina Natalia B ¹

Dormidontov Nikolay A ¹

Zheleznyi Mark V ¹

Bakulina Anna S ¹

Prokofev Pavel A ¹

Andreenko Aleksandr S ¹

Milov Yury V ¹

Sysoev Nikolay N ¹

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LLC “MEM”, 123458 Moscow, Russia |

Publication type: Journal Article

Publication date: 2021-12-15

Multidisciplinary Digital Publishing Institute (MDPI)

Journal: Materials

Quartile SCImago

Quartile WOS

Impact factor: 3.4

ISSN: 19961944

DOI: 10.3390/ma14247762

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General Materials Science

Abstract

Observations of the surface domain structure (Kerr-effect), optical metallography, scanning electron microscopy (SEM-SE), and electron microprobe analysis (EPMA-SEM), measurements of major and minor magnetic hysteretic loops were used to study pseudo-single-crystal samples of (Sm,Zr)(Co,Cu,Fe)z alloys subjected to heat treatments to the high-coercivity state, which are used in fabricating sintered permanent magnets. Correlations between the chemical composition, hysteretic properties, structural components, domain structure, and phase state were determined for the concentration ranges that ensure wide variations of 4f-/4d-/3d-element ratio in the studied samples. The phase state formed by collinear and coherent phase components determines the high coercive force and ultimate magnetic hysteresis loops of the pseudo-single crystals. It was found that the 1:5 phase with the hexagonal structure (P6/mmm) is the matrix of the alloys for (Sm,Zr)(Co,Cu,Fe)z permanent magnets; the matrix undergoes phase transformations in the course of all heat treatments for the high-coercivity state. The heterogeneity observed with optical magnifications, namely, the observation of main structural components A and B, is due to the alternation, within the common matrix, of regions with modulated quasi-spherical precipitates and regions with hexagonal bipyramids (cellular phase) although, traditionally, many investigators consider the cellular phase as the matrix. It is shown that the relationship of volume fractions of structural components A and B that account for more than 0.9 volume fraction of the total, which is due to the integral chemical composition of the alloys, determines the main hysteretic performances of the samples. The Zr-rich phases, such as 5:19, 2:7, and 6:23, and a structural component with the variable stoichiometry (Sm(Co,Cu,Fe)3.5–5) that is almost free of Zr and contains up to 33 at% Cu, were found only within structural component A in quantities sufficient for EPMA analysis.

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Crystals	Crystals, 1, 33.33% Crystals 1 publication, 33.33%
Russian Metallurgy (Metally)	Russian Metallurgy (Metally), 1, 33.33% Russian Metallurgy (Metally) 1 publication, 33.33%
Inorganic Materials: Applied Research	Inorganic Materials: Applied Research, 1, 33.33% Inorganic Materials: Applied Research 1 publication, 33.33%
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Pleiades Publishing	Pleiades Publishing, 2, 66.67% Pleiades Publishing 2 publications, 66.67%
Multidisciplinary Digital Publishing Institute (MDPI)	Multidisciplinary Digital Publishing Institute (MDPI), 1, 33.33% Multidisciplinary Digital Publishing Institute (MDPI) 1 publication, 33.33%
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Dormidontov A. G. et al. Structure of Alloys for (Sm,Zr)(Co,Cu,Fe)z Permanent Magnets: III. Matrix and Phases of the High-Coercivity State // Materials. 2021. Vol. 14. No. 24. p. 7762.

GOST all authors (up to 50) Copy

Dormidontov A. G., Kolchugina N. B., Dormidontov N. A., Zheleznyi M. V., Bakulina A. S., Prokofev P. A., Andreenko A. S., Milov Y. V., Sysoev N. N. Structure of Alloys for (Sm,Zr)(Co,Cu,Fe)z Permanent Magnets: III. Matrix and Phases of the High-Coercivity State // Materials. 2021. Vol. 14. No. 24. p. 7762.

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TY - JOUR

DO - 10.3390/ma14247762

UR - https://doi.org/10.3390%2Fma14247762

TI - Structure of Alloys for (Sm,Zr)(Co,Cu,Fe)z Permanent Magnets: III. Matrix and Phases of the High-Coercivity State

T2 - Materials

AU - Dormidontov, Andrey G

AU - Kolchugina, Natalia B

AU - Dormidontov, Nikolay A

AU - Zheleznyi, Mark V

AU - Bakulina, Anna S

AU - Prokofev, Pavel A

AU - Andreenko, Aleksandr S

AU - Milov, Yury V

AU - Sysoev, Nikolay N

PY - 2021

DA - 2021/12/15 00:00:00

PB - Multidisciplinary Digital Publishing Institute (MDPI)

SP - 7762

IS - 24

VL - 14

SN - 1996-1944

ER -

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@article{2021_Dormidontov,

author = {Andrey G Dormidontov and Natalia B Kolchugina and Nikolay A Dormidontov and Mark V Zheleznyi and Anna S Bakulina and Pavel A Prokofev and Aleksandr S Andreenko and Yury V Milov and Nikolay N Sysoev},

title = {Structure of Alloys for (Sm,Zr)(Co,Cu,Fe)z Permanent Magnets: III. Matrix and Phases of the High-Coercivity State},

journal = {Materials},

year = {2021},

volume = {14},

publisher = {Multidisciplinary Digital Publishing Institute (MDPI)},

month = {dec},

url = {https://doi.org/10.3390%2Fma14247762},

number = {24},

pages = {7762},

doi = {10.3390/ma14247762}

}

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Dormidontov, Andrey G., et al. “Structure of Alloys for (Sm,Zr)(Co,Cu,Fe)z Permanent Magnets: III. Matrix and Phases of the High-Coercivity State.” Materials, vol. 14, no. 24, Dec. 2021, p. 7762. https://doi.org/10.3390%2Fma14247762.

Found error?

Publisher

Multidisciplinary Digital Publishing Institute (MDPI)

Journal

Materials

Quartile SCImago

Quartile WOS

Impact factor

3.4

ISSN

19961944 (Print)

Labs

Laboratory 12: Physics and Chemistry of refractory and rare metals and alloys

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