Optimization of Structure and Magnetic Properties of NdFeBTi Nanocomposite Magnets
| Autor: | Daniela Derewnicka, Hanna J. Krztoń, Piotr Dłużewski, Marzena Spyra |
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| Rok vydání: | 2012 |
| Předmět: |
Nanocomposite
Materials science Annealing (metallurgy) Alloy chemistry.chemical_element engineering.material Condensed Matter Physics Microstructure Atomic and Molecular Physics and Optics law.invention Crystallography chemistry law Transmission electron microscopy engineering General Materials Science Grain boundary Crystallization Composite material Titanium |
| Zdroj: | Solid State Phenomena. 186:206-211 |
| ISSN: | 1662-9779 |
| DOI: | 10.4028/www.scientific.net/ssp.186.206 |
| Popis: | This study investigated alloys with the composition Nd9Fe77B14 and Nd9Fe73Ti4B14 (at.%). Materials were melt spun in the form of a partially amorphous ribbon, which was subsequently annealed at 953K in order to obtain the optimum magnetic properties. The highest properties were obtained for annealing lasting 20 minutes (JHC = 913kA/m, Jr = 0,84T, BHmax = 107kJ/m3). Annealing at 953K results in simultaneous crystallisation in the whole mass of the alloy. The growth of grains is controlled by the duration of the annealing process. The objective of this work was to study the mechanisms of crystallisation and the reasons for a finer structure resulting from the presence of titanium. The phase composition was evaluated by X-ray diffraction. The microstructure was studied using a high-resolution transmission electron microscope. Detailed analysis of titanium distribution in the grains and in the grain boundaries was examined by x-ray spectrometry. |
| Databáze: | OpenAIRE |
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