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Browse Journals & Magazines > Magnetics, IEEE Transactions ...> Volume:37 Issue:4 Help

Solidification, quenching gas and magnetic properties in melt-spun Nd2Fe14B

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4 Author(s)
Lewis, L.H. ; Div. of Mater. & Chem. Sci., Brookhaven Nat. Lab., Upton, NY, USA ; Collins, S.M. ; Kramer, M.J. ; Lo, C.C.H.

Magnetic measurement and cross-sectional Magnetic Force Microscopy images were obtained from Nd2Fe14B ribbons melt-quenched at a circumferential wheel speed of 10 m/sec in three different atmospheres: 1 atm Ar, 1 atm He and 1/3 atm He. The striking effects of the quenching gas type upon the microstructure is correlated with room-temperature demagnetization curves that confirm the presence of multiple, yet discontinuous, grain size zones. A model for the rapid solidification of Nd2Fe14B based on consideration of recalescence relative to the peritectic temperature is invoked to explain the experimental results. The recalescence causes breakup of the Nd2Fe14B dendrites formed during the first phase of solidification and results in a layered structure within the ribbon possessing distinct transition regions where the solidification front temperature crosses the peritectic temperature

Published in:
Magnetics, IEEE Transactions on  (Volume:37 ,  Issue: 4 )

Date of Publication: Jul 2001

Page(s):
2486 - 2488
ISSN :
0018-9464
INSPEC Accession Number:
7071639
Digital Object Identifier :
10.1109/20.951211
Product Type:
Journals & Magazines
Date of Current Version :
07 August 2002
Issue Date :
Jul 2001
Sponsored by :
IEEE Magnetics Society

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