Anin situneutron diffraction study of magnetic hardening in Fe3B/Nd2Fe14B nanocomposite magnets induced by rapid thermal annealing

Autor:	Jasmine Chia-hsin Shih, Gabriel J. Cuello, Jose Javier Saiz Garitaonandia, Kiyonori Suzuki, Tomoyuki Shoji, Akira Kato, Shin Tajima
Rok vydání:	2009
Předmět:	Diffraction Materials science Neutron diffraction Metallurgy Alloy Nucleation Analytical chemistry General Physics and Astronomy engineering.material Coercivity Amorphous solid engineering Hardening (metallurgy) Melt spinning
Zdroj:	Journal of Applied Physics. 105:07A735
ISSN:	1089-7550 0021-8979
Popis:	Neutron diffraction patterns were acquired in situ from a melt-spun amorphous Fe74Nd5B18Cr3 alloy upon heating at constant rates of 1.7×10−2 and 1.3 K/s. The diffraction patterns revealed the following decomposition reaction with two different intermediate routes: amorphous→Fe3B/Nd2Fe23B3 (at 1.7×10−2 K/s) or Fe3B/Nd2Fe14B (at 1.3 K/s)→Fe/Fe2B/Nd1.1Fe4B4. This confirms that the changeover between the two ternary compounds in the metastable intermediate state is the direct cause of magnetic hardening induced by rapid heating. The effect of group IVA-VIA metals on the magnetic hardness of Fe77Nd5B18 was investigated and only the 3d transition-metal additives appeared to be effective in enhancing the coercivity. The heterogeneous nucleation of Nd2Fe14B on tetragonal-Fe3B precipitates promoted by the 3d transition-metal additives is proposed as a possible mechanism of magnetic hardening.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::984ec893f7a4e4bec8f1949b2a2194f8 https://doi.org/10.1063/1.3068462 Zobrazit plný text záznamu