skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Magnetic properties and microstructure of melt-spun Nd-Fe-Ga-B alloys

Abstract

The magnetic and microstructural properties of melt-spun Nd{sub 18}Fe{sub 76{minus}X}Ga{sub X}B{sub 6} alloys have been studied as a function of Ga content. Coercivities of 17 kOe were obtained in underquenched samples having a large grain size of 500 nm. Samples prepared at wheel speeds of 15--19 m/sec, as well as overquenched (40 m/sec) and subsequently annealed, gave coercivities of around 20 kOe with no significant improvement of H{sub c} upon Ga substitution. In Ga-free samples prepared by annealing highly overquenched ribbons (at 60 m/sec) only moderate coercive fields could be achieved (14 kOe). These samples had grain sizes of 70--100 nm. However Ga substituted samples prepared under the same conditions have a fine grain structure consisting of unequiaxed grains with size around 20 nm and show coercivities up to 23 kOe.

Authors:
; ;  [1]
  1. Univ. of Delaware, Newark, DE (United States). Dept. of Physics and Astronomy
Publication Date:
OSTI Identifier:
186925
Report Number(s):
CONF-950404-
Journal ID: IEMGAQ; ISSN 0018-9464; TRN: IM9609%%198
Resource Type:
Journal Article
Journal Name:
IEEE Transactions on Magnetics
Additional Journal Information:
Journal Volume: 31; Journal Issue: 6Pt2; Conference: Conference on magnetism and magnetic materials, San Antonio, TX (United States), 18-21 Apr 1995; Other Information: PBD: Nov 1995
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NEODYMIUM ALLOYS; MAGNETIC PROPERTIES; MICROSTRUCTURE; IRON BASE ALLOYS; GALLIUM ALLOYS; BORON ALLOYS; GALLIUM; METALLURGICAL EFFECTS; PERMANENT MAGNETS; EXPERIMENTAL DATA; GRAIN SIZE; COERCIVE FORCE

Citation Formats

Panagiotopoulos, I, Murthy, A S, and Hadjipanayis, G C. Magnetic properties and microstructure of melt-spun Nd-Fe-Ga-B alloys. United States: N. p., 1995. Web. doi:10.1109/20.489587.
Panagiotopoulos, I, Murthy, A S, & Hadjipanayis, G C. Magnetic properties and microstructure of melt-spun Nd-Fe-Ga-B alloys. United States. doi:10.1109/20.489587.
Panagiotopoulos, I, Murthy, A S, and Hadjipanayis, G C. Wed . "Magnetic properties and microstructure of melt-spun Nd-Fe-Ga-B alloys". United States. doi:10.1109/20.489587.
@article{osti_186925,
title = {Magnetic properties and microstructure of melt-spun Nd-Fe-Ga-B alloys},
author = {Panagiotopoulos, I and Murthy, A S and Hadjipanayis, G C},
abstractNote = {The magnetic and microstructural properties of melt-spun Nd{sub 18}Fe{sub 76{minus}X}Ga{sub X}B{sub 6} alloys have been studied as a function of Ga content. Coercivities of 17 kOe were obtained in underquenched samples having a large grain size of 500 nm. Samples prepared at wheel speeds of 15--19 m/sec, as well as overquenched (40 m/sec) and subsequently annealed, gave coercivities of around 20 kOe with no significant improvement of H{sub c} upon Ga substitution. In Ga-free samples prepared by annealing highly overquenched ribbons (at 60 m/sec) only moderate coercive fields could be achieved (14 kOe). These samples had grain sizes of 70--100 nm. However Ga substituted samples prepared under the same conditions have a fine grain structure consisting of unequiaxed grains with size around 20 nm and show coercivities up to 23 kOe.},
doi = {10.1109/20.489587},
journal = {IEEE Transactions on Magnetics},
number = 6Pt2,
volume = 31,
place = {United States},
year = {1995},
month = {11}
}