Helbig, Tim ; Abel, Andreas ; Sawatzki, Simon ; Gröb, Thorsten ; Dirba, Imants ; Ener, Semih ; Gutfleisch, Oliver (2024)
Anisotropic grain boundary diffusion process in textured sintered and hot-deformed Nd-Fe-B magnets.
In: Journal of Alloys and Compounds
doi: 10.1016/j.jallcom.2024.174490
Article, Bibliographie
Abstract
A systematic study of the dependence of the Grain Boundary Diffusion Process (GBDP) on texture using Dy and Dy-Nd-Cu in microcrystalline sintered and nanocrystalline hot deformed Nd-Fe-B magnets was performed. Diffusion parallel or perpendicular to the texture direction, the nominal c-axes orientation in the polycrystals, was investigated. By measuring thin slices from the respective samples, coercivity as a function of (i) magnet thickness and (ii) diffusion depth was obtained showing that GBDP efficiency depends on the diffusion direction, diffusion source as well as the grain morphology originating from the magnet production route. In nanocrystalline hot deformed magnets perpendicular diffusion is superior due to the platelet-like shape of the grains. Microcrystalline sintered magnets consist of equiaxed grains hence the main effects originate in anisotropic lattice diffusion and pole surface hardening. The magnetic properties are correlated with a comprehensive analysis of microstructure, chemistry and magnetization reversal.
| Item Type: | Article |
|---|---|
| Erschienen: | 2024 |
| Creators: | Helbig, Tim ; Abel, Andreas ; Sawatzki, Simon ; Gröb, Thorsten ; Dirba, Imants ; Ener, Semih ; Gutfleisch, Oliver |
| Type of entry: | Bibliographie |
| Title: | Anisotropic grain boundary diffusion process in textured sintered and hot-deformed Nd-Fe-B magnets |
| Language: | English |
| Date: | 18 April 2024 |
| Publisher: | Elsevier |
| Journal or Publication Title: | Journal of Alloys and Compounds |
| DOI: | 10.1016/j.jallcom.2024.174490 |
| Abstract: | A systematic study of the dependence of the Grain Boundary Diffusion Process (GBDP) on texture using Dy and Dy-Nd-Cu in microcrystalline sintered and nanocrystalline hot deformed Nd-Fe-B magnets was performed. Diffusion parallel or perpendicular to the texture direction, the nominal c-axes orientation in the polycrystals, was investigated. By measuring thin slices from the respective samples, coercivity as a function of (i) magnet thickness and (ii) diffusion depth was obtained showing that GBDP efficiency depends on the diffusion direction, diffusion source as well as the grain morphology originating from the magnet production route. In nanocrystalline hot deformed magnets perpendicular diffusion is superior due to the platelet-like shape of the grains. Microcrystalline sintered magnets consist of equiaxed grains hence the main effects originate in anisotropic lattice diffusion and pole surface hardening. The magnetic properties are correlated with a comprehensive analysis of microstructure, chemistry and magnetization reversal. |
| Uncontrolled Keywords: | Nd-Fe-B, grain boundary diffusion, coercivity |
| Additional Information: | Artikel-ID: 174490 |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Functional Materials 11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy |
| Date Deposited: | 25 Apr 2024 06:44 |
| Last Modified: | 25 Apr 2024 08:54 |
| PPN: | 517482827 |
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