|
ИСТИНА |
Войти в систему Регистрация |
ИПМех РАН |
||
Influence of Hydrogen and Mechanochemical Activation on the Properties of Nd-Fe-B- and Sm-Fe-N-Type Magnetic Materialsтезисы доклада
- Авторы: Mitrokhin S.V., Savchenko A.G., Verbetsky V.N., Movlaev E.A., Shchetinin I.V., Menushenkov V.P.
- Сборник: Proceedings of Internaional Symposium on Metal-Hydrogen Systems
- Тезисы
- Год издания: 2014
- Место издания: The University of Salford Manchester, UK
- Первая страница: 405
- Последняя страница: 405
- Аннотация: In spite of the fact that a lot of works are devoted to hydrogen interaction with Sm2Fe17 and R2Fe14B intermetallic compounds and alloys of Nd-Fe-B system, a number of aspects, such as influence of hydrogenation and absorbtion-desorption cycling on magnetocrystal anisotropy and mechanism of its formation, are studied insufficiently.The relationship between the quantity of absorbed hydrogen and the dimensions and morphology of hydride particles is not find out, though this data is necessary for correct design of reactors for hydriding of magnetic alloys. In present work the influence of hydriding-dehydriding procedures on the phase composition, structure and powder morphology of mechanoactivated R2Fe14B-based alloys. It was found that the high-energy milling leads to increase of coercitivity of dehydrided powders up to 2.4 kOe, that is almost 10 times higher than coercitivity of the as-cast alloy. Also, mechanoactivation of as-cast R2Fe14B alloy results in formation of two types of amorphous regions with different composition. In case of Sm-Fe-N alloys the phase composition, structure and magnetic properties of Sm2Fe17Nх nitrides, obtained by nitrigenation of Sm2Fe17 both as milled powder and HD powder, are almost the same. However, HD process significantly accelerates the nitride formation. Additional mechanoactivation of hydrides leads to increase of coercitivity of nitrides. The analysis of the changes of the remagnetisation and partial hysterisis loop curves, depending on the obtaining conditions and the duration of milling, shows that the limiting stage of the remagnetisation processes in nitirides is the generation and groth of reverse magnetisation domains.
- Добавил в систему: Митрохин Сергей Владиленович