Effect of TiC addition on microstructure and magnetic properties for MRE{sub 2}(Fe,Co){sub 14}B melt-spun ribbons (MRE=Nd+Y+Dy)

Journal Article · Sat Apr 15 04:00:00 EDT 2006 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.2165109· OSTI ID:20788105

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 USDOE, Iowa State University, Ames, Iowa 50010 (United States)

Effects of a TiC addition on microstructure and magnetic properties in [MRE{sub 2.2}Fe{sub 14}B]{sub (100-2x)/17.2}+Ti{sub x}C{sub x}(MRE=Nd+Y+Dy,x=1-5) ribbons, melt spun at a wheel speed of 16 m/s, were systematically studied. X-ray diffraction and differential thermal analysis data revealed that the addition of TiC improves the glass formability in the mixed rare earth alloys without Co, resulting in partially amorphous alloys. TEM observations showed that the average grain size in the as spun samples decreases from 200 to 20 nm with increasing x from 1 to 5, confirming that the addition of TiC can significantly improve microstructure. For an optimized [MRE{sub 2}(Fe,Co){sub 14}B]{sub (100-2x)/17.2}+Ti{sub x}C{sub x} sample with x=2, spun at 25 m/s and annealed at 750 deg. C for 15 min, the room-temperature magnetic properties of H{sub cj}=11.8 kOe, M{sub r}=7.2 kGs, and (BH){sub max}=11.3 MGOe were obtained. Temperature coefficients for M{sub r} and H{sub cj} of -0.06 and -0.37%/ deg. C, respectively, also were measured in the temperature range of 27-100 deg. C. The new magnet alloy exhibits more uniform magnetic properties and a usable energy product to nearly 300 deg. C.

• OSTI ID: 20788105
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 99; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
BORON ALLOYS
COBALT ALLOYS
DIFFERENTIAL THERMAL ANALYSIS
DYSPROSIUM ALLOYS
GRAIN SIZE
IRON ALLOYS
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
NEODYMIUM ALLOYS
PERMANENT MAGNETS
TEMPERATURE COEFFICIENT
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 1000-4000 K
TIME DEPENDENCE
TITANIUM CARBIDES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
YTTRIUM ALLOYS