Journal Article

FZJ-2018-06074

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Effect of annealing conditions on the microstructure and magnetic properties of sintered Nd-Fe-B magnets as seen by magnetic small-angle neutron scatteringml

Périgo, É. A. (Corresponding author) ; Titov, I. ; Weber, R. ; Mettus, D. ; Peral, I. ; Vallcorba, O. ; Honecker, D. ; Feoktystov, A.FZJ* ; Michels, A.

2018
IOP Publ. Bristol

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Please use a persistent id in citations: doi:10.1088/2053-1591/aab7aa

Abstract: We have investigated the effect of the annealing conditions (heating rate and temperature) on themagnetic microstructure of sintered Nd-Fe-B magnets by means of magnetometry, scanning electronmicroscopy, high-energy synchrotron x-ray diffraction, and small-angle neutron scattering (SANS).While the temperature treatment has a strong effect on the coercivity (reduction by about 50% onannealing), the associated changes in the microstructure do surprisingly not show up (or at best onlyvery weakly) in the neutron-scattering signal, which probes a mesoscopic real-space length scaleranging between about 1–300 nm. On the other hand, the x-ray data reveal microstructural changes inthe Nd-rich phases, presumably due to modifications in grain-boundary regions. Moreover, weobserve an unusual diamond-shaped angular anisotropy in the SANS cross section, which stronglypoints towards the existence of texture in the nuclear microstructure.

Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd) ; Materials Science (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS-FRM-II)
2. Streumethoden (JCNS-2)

Research Program(s):

1. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)
2. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)

Experiment(s):

1. KWS-1: Small angle scattering diffractometer (NL3b)

Appears in the scientific report 2018

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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