Dirba, I. ; Sawatzki, S. ; Gutfleisch, O. (2014)
Net-shape and crack-free production of Nd–Fe–B magnets by hot deformation.
In: Journal of Alloys and Compounds, 589
doi: 10.1016/j.jallcom.2013.11.188
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
In order to reduce the amount of material waste and therefore to use the precious rare earth element Nd in a more efficient way, routes for the production of crack-free hot-deformed nanocrystalline Nd–Fe–B magnets (using melt-spun ribbons as a precursor) have been investigated. In contrast to the conventional route in which material flows into a cavity, pressing tool has been used in order to exert a back pressure during backward extrusion, leading to crack-free and net-shape production of radially oriented ring magnets, without detrimental influence on magnetic properties. Micrographs demonstrate overall good alignment of elongated platelet shaped grains with radially oriented c-axis in most parts of the ring. A mean remanence Jr = 1.27 T and coercivity μ0iHc = 1.5 T has been obtained. Degree of texture reaches around 0.7. Furthermore, die-upsetting has been performed for different degrees of deformation to obtain crack-free, mechanically and magnetically homogenous, axially oriented tablet magnets.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2014 |
| Autor(en): | Dirba, I. ; Sawatzki, S. ; Gutfleisch, O. |
| Art des Eintrags: | Bibliographie |
| Titel: | Net-shape and crack-free production of Nd–Fe–B magnets by hot deformation |
| Sprache: | Englisch |
| Publikationsjahr: | 15 März 2014 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Alloys and Compounds |
| Jahrgang/Volume einer Zeitschrift: | 589 |
| DOI: | 10.1016/j.jallcom.2013.11.188 |
| Kurzbeschreibung (Abstract): | In order to reduce the amount of material waste and therefore to use the precious rare earth element Nd in a more efficient way, routes for the production of crack-free hot-deformed nanocrystalline Nd–Fe–B magnets (using melt-spun ribbons as a precursor) have been investigated. In contrast to the conventional route in which material flows into a cavity, pressing tool has been used in order to exert a back pressure during backward extrusion, leading to crack-free and net-shape production of radially oriented ring magnets, without detrimental influence on magnetic properties. Micrographs demonstrate overall good alignment of elongated platelet shaped grains with radially oriented c-axis in most parts of the ring. A mean remanence Jr = 1.27 T and coercivity μ0iHc = 1.5 T has been obtained. Degree of texture reaches around 0.7. Furthermore, die-upsetting has been performed for different degrees of deformation to obtain crack-free, mechanically and magnetically homogenous, axially oriented tablet magnets. |
| Freie Schlagworte: | Nd–Fe–B, Permanent magnet, Die-upsetting, Hot deformation, Backward extrusion |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 13 Mär 2014 12:17 |
| Letzte Änderung: | 13 Mär 2014 12:17 |
| PPN: | |
| Sponsoren: | We thank the BMWi (Bundesministerium f. Wirtschaft und Technologie) via IGF (Industrielle Gemeinschaftsforschung), AiF (Allianz Industrie Forschung), FVA (Forschungsvereinigung Antriebstechnik e.V.), and the DBU (Deutsche Bundesstifung Umwelt) for financial support as well as Prof. L. Schultz (IFW Dresden) for hosting the DBU Programme. |
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