Comparison of microstructure and magnetic properties of gas-atomized and melt-spun MRE-Fe-Co-M-B (MRE=Y+Dy+Nd,M=Zr+TiC)

Journal Article · Tue May 01 00:00:00 EDT 2007 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.2710551· OSTI ID:20982865

Tang, W; Wu, Y Q; Dennis, K W; Kramer, M J; Anderson, I E; McCallum, R W ^[1]

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1. Ames Laboratory of USDOE, Iowa State University, Ames, Iowa 50011 (United States)

An MRE{sub 2}(Fe,Co){sub 14}B alloy with Zr substitution and TiC addition was systematically studied. It was found by means of X-ray diffraction, transmission electron microscopy (TEM) and magnetic measurements that the combination of Zr substitution and TiC addition yields adequate microstructural control in both gas atomization (GA) and melt spinning (MS) techniques. For MS ribbons, an H{sub cj} of 11.7 kOe and (BH){sub max} of 11.9 MGOe at 27 degree sign C were obtained in the ribbons spun at 16 m/s and annealed at 700 degree sign C for 15 min. For GA powders, an H{sub cj} of 9.1 kOe and (BH){sub max} of 9.2 MGOe at 27 degree sign C were obtained in 20-25 {mu}m GA powder annealed at 700 degree sign C for 15 min. The temperature coefficients of B{sub r} and H{sub cj} are 0.06 and 0.36%/ degree sign C for the MS ribbon and 0.09 and 0.4%/ degree sign C for the GA powder in the temperature range of 27-100 degree sign C, respectively. TEM images revealed that the MS ribbon consists of a fine and uniform microstructure with an average size of 30 nm, while the GA spherical powder consists of an interior coarsened microstructure with a grain size of 80 nm and a rim area with a grain size of 10 nm.

• OSTI ID: 20982865
• Journal Information: Journal of Applied Physics, Vol. 101, Issue 9; Conference: 10. joint MMM/INTERMAG conference, Baltimore, MD (United States), 7-11 Jan 2007; Other Information: DOI: 10.1063/1.2710551; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
ATOMIZATION
BORON ALLOYS
COBALT ALLOYS
DYSPROSIUM ALLOYS
FERROMAGNETIC MATERIALS
GRAIN SIZE
IRON ALLOYS
MAGNETIC PROPERTIES
NEODYMIUM ALLOYS
POWDERS
TEMPERATURE COEFFICIENT
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TITANIUM CARBIDES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
YTTRIUM ALLOYS
ZIRCONIUM ALLOYS