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Structure and Magnetic Properties of Mechanically Synthesized (Fe1 – xNix)75C25 Nanocompositesстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 21 февраля 2018 г.
- Авторы: Ul’yanov A.I., Chulkina A.A., Volkov V.A., Ul’yanov A.L., Zagainov A.V.
- Журнал: Physics of Metals and Metallography
- Том: 118
- Номер: 7
- Год издания: 2017
- Издательство: Pleiades Publishing, Inc.
- Местоположение издательства: New York, USA
- Первая страница: 691
- Последняя страница: 699
- DOI: 10.1134/S0031918X17050143
- Аннотация: X-ray diffraction, Mössbauer spectroscopy, and magnetic measurements have been used to study the phase formation in (Fe1 – xNix)75C25 (with х = 0–0.20) nanocomposites during severe plastic deformation in a planetary ball mill and subsequent annealings. It has been shown that the mechanical synthesis results in the formation of mainly a nickel-alloyed nanocrystalline (Fe, Ni)3C cementite with a distorted crystal lattice and an amorphous Fe–Ni–C phase. During heating above 300°С, the amorphous phase crystallizes with the formation of cementite, which is characterized by a higher Ni content compared to that in mechanically synthesized cementite. The mechanically synthesized samples exhibit low coercive force (equal to several tens ampere per centimeter). During annealing at temperatures of up to 500–550°С, crystal lattice distortions are removed; this results in reliving the magnetic anisotropy constant and high-coercivity state of cementite. At the same time, Ni-rich cementite areas decompose with the formation of γ-(Fe, Ni, C) phase (austenite); as a result, the average nickel content in the cementite substantially decreases. Annealings at higher temperatures cause the complete decomposition of cementite and leads to an abrupt decrease in the coercive force (Нс) of samples. Alloying with nickel leads to an increase in the Curie temperature of cementite, a decrease in its specific saturation magnetization, coercive force, and thermal stability.
- Добавил в систему: Чулкина Алевтина Антониновна