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Microstructural and magnetic properties of Nd-Fe-B alloys processed by equal-channel angular pressing

Onal, E, Lapovok, R, Kishimoto, H, Kato, A, Davies, C H J and Suzuki, K 2015, Microstructural and magnetic properties of Nd-Fe-B alloys processed by equal-channel angular pressing, Journal of applied physics, vol. 117, no. 17, Article Number : 17A742, pp. 1-4, doi: 10.1063/1.4918569.

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Title Microstructural and magnetic properties of Nd-Fe-B alloys processed by equal-channel angular pressing
Author(s) Onal, E
Lapovok, R
Kishimoto, H
Kato, A
Davies, C H J
Suzuki, K
Journal name Journal of applied physics
Volume number 117
Issue number 17
Season Article Number : 17A742
Start page 1
End page 4
Total pages 4
Publisher American Institute of Physics
Place of publication College Park, Md.
Publication date 2015
ISSN 0021-8979
1089-7550
Summary Equal-channel angular pressing (ECAP) is a well-established thermo-mechanical processing technique. This technique allows virtually unlimited strain and manipulation of texture by processing route, while the cross-section of the sample remains unchanged during processing. In order to clarify the effectiveness of ECAP on preparing anisotropic permanent magnets, the microstructure and magnetic properties of a melt-spun Nd13.5Fe73.8Co6.7B5.6Ga0.4 alloy processed at 773-K for 300-s by ECAP were investigated. Macrotexture analysis carried out for the exit channel of ECAP shows that the basal plane of the tetragonal Nd2Fe14B crystal aligns parallel to the shear band, i.e., the c-axis texture formation normal to the shear band induced by the ECAP process. Due to this texture formation, the technical magnetization behaviour becomes anisotropic, and the remanent magnetization is clearly enhanced along the direction perpendicular to the shear band. This anisotropic microstructure is realized at a relatively low processing temperature of 773-K, well below the melting point of the Nd-rich intergranular phase. As a consequence of this lower processing temperature, the nanostructure of the melt-spun alloy remains approximately 20 to 30-nm, considerably smaller than the typical grain size obtained after conventional die-upsetting. Our study demonstrates that equal-channel angular pressing has a potential for realising anisotropic nanostructured magnets.
Language eng
DOI 10.1063/1.4918569
Field of Research 091207 Metals and Alloy Materials
02 PHYSICAL SCIENCES
01 MATHEMATICAL SCIENCES
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, American Institute of Physics Inc.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30075945

Document type: Journal Article
Collection: Institute for Frontier Materials
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Created: Thu, 29 Oct 2015, 12:35:55 EST

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