The structure and magnetic properties of rapidly quenched and annealed multi-phase nanocrystalline Nd9Fe91−B ribbons
| Autor: | A.S. Yermolenko, A. G. Popov, V. S. Gaviko, A.M. Gabay, Ye.V. Belozerov |
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| Rok vydání: | 1996 |
| Předmět: |
Materials science
Annealing (metallurgy) Mechanical Engineering Metals and Alloys Analytical chemistry chemistry.chemical_element Coercivity Nanocrystalline material Nuclear magnetic resonance Neodymium magnet chemistry Mechanics of Materials Remanence Metastability Materials Chemistry Curie temperature Boron |
| Zdroj: | Journal of Alloys and Compounds. 245:119-124 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/s0925-8388(96)02403-6 |
| Popis: | Melt-spun and annealed Nd 9 Fe 91− x B x ribbons with 0 ≤ x ≤ 9 have been studied by means of X-ray diffraction, thermomagnetic analysis and magnetic measurements. The metastable phase diagram up to 780°C has been plotted. A metastable phase of the TbCu 2 structure has been identified in the ribbons of binary composition and those containing up to 7 at.% B. The Curie temperature of this phase was found to be strongly affected by both boron content and annealing temperature. The structure of exchange coupled nanocrystallines of Nd 2 Fe 14 B. α-Fe and Fe 3 B was realized by means of short-time annealing. The annealed isotropic Nd 9 Fe 84 B, ribbons had a remanence of 100.5 emu g −1 , an intrinsic coercivity of 4.5 kOe, and an energy product of about 13 MG Oe. The details of structure formation, as well as the criteria and conditions for the effective exchange coupling, are discussed. |
| Databáze: | OpenAIRE |
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