Structural and magnetic studies of bulk nanocomposite magnets derived from rapidly solidified Pr-(Fe, Co)-(Zr, Nb)-B alloy

Katarzyna Pawlik , Piotr Pawlik , Jerzy J. Wysłocki , Waldemar Kaszuwara

Abstract

In the present study, the phase constitution, microstructure and magnetic properties of the nanocrystalline magnets, derived from fully amorphous or partially crystalline samples by annealing, were analyzed and compared. The melt-spun ribbons (with a thickness of ~30 μm) and suction-cast 0.5 mm and 1 mm thick plates of the Pr9Fe50Co13Zr1Nb4B23 alloy were soft magnetic in the as-cast state. In order to modify their magnetic properties, the annealing process was carried out at various temperatures from 923K to 1033K for 5 min. The Rietveld refinement of X-ray diffraction patterns combined with the partial or no known crystal structures (PONKCS) method allowed one to quantify the component phases and calculate their crystalline grain sizes. It was shown that the volume fraction of constituent phases and their crystallite sizes for the samples annealed at a particular temperature, dependent on the rapid solidification conditions, and thus a presence or absence of the crystallization nuclei in the as-cast state. Additionally, a thermomagnetic analysis was used as a complementary method to confirm the phase constitution. The hysteresis loops have shown that most of the samples exhibit a remanence enhancement typical for the soft/hard magnetic nanocomposite. Moreover, for the plates annealed at the lowest temperatures, the highest coercivities up to ~1150 kA/m were measured.

Author Katarzyna Pawlik - Politechnika Częstochowska (PCz)
Katarzyna Pawlik,,
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, Piotr Pawlik - Politechnika Częstochowska (PCz)
Piotr Pawlik,,
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, Jerzy J. Wysłocki - Politechnika Częstochowska (PCz)
Jerzy J. Wysłocki,,
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, Waldemar Kaszuwara (FMSE / DCFM)
Waldemar Kaszuwara,,
- Division of Construction and Functional Materials
Journal seriesMaterials, ISSN 1996-1944
Issue year2020
Vol13
Pages1-16
Publication size in sheets0.75
Keywords in Englishbulk metallic glasses; hard magnetic materials; RE-Fe-B magnets; rapid solidification; devitrification annealing; Rietveld analysis; magnetic properties; miniature magnets; bulk nanostructured magnets
ASJC Classification2500 General Materials Science
DOIDOI:10.3390/ma13071515
URL https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7177373/
Languageen angielski
File
Structural_and_Magnetic_Studies_of_Bulk_Nanocompos.pdf 7.52 MB
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 22-07-2020, ArticleFromJournal
Publication indicators Scopus Citations = 1; Scopus SNIP (Source Normalised Impact per Paper): 2017 = 1.285; WoS Impact Factor: 2018 = 2.972 (2) - 2018=3.532 (5)
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