Effect of TiC additions to the microstructure and magnetic properties of Nd{sub 9.5}Fe{sub 84.5}B{sub 6} melt-spun ribbons

Journal Article · Mon Jun 01 04:00:00 EDT 1998 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.367929· OSTI ID:627980

Kramer, M J; Li, C P; Dennis, K W; McCallum, R W ^[1]; Sellers, C H; Branagan, D J ^[2]; Lewis, L H; Wang, J Y ^[3]

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1. 39 Wilhelm Hall, Ames Laboratory, Ames, Iowa50011 (United States)
2. Lockheed Martin Idaho Technologies Company, and Idaho National Engineering and Environmental Laboratory, Idaho Falls, Idaho83415-2218 (United States)
3. Department of Applied Science, Brookhaven National Laboratory, Upton, New York11973 (United States)

Rapidly solidified samples of Nd{sub 9.5}Fe{sub 84.5}B{sub 6} with and without 3 at.{percent} TiC were prepared by melt spinning and melt extraction and then annealed in vacuum (3{times}10{sup {minus}6} Torr) at temperatures from 600 to 750{degree}C. For alloys melt spun under similar conditions, the overquenched state was achieved at wheel speeds {gt}10 m/s for the TiC added alloy while {gt}20 m/s was necessary without TiC. The overquenched samples contained a smaller fraction of {alpha}-Fe in smaller grains than the undercooled samples where Fe dendrites formed near the free surface during solidification. These Fe dendrites were not removed by annealing. In addition, large orientated 2-14-1 grains nucleated on the Fe dendrites. This combination is detrimental to the magnetic properties. The addition of TiC results in improved control of the microstructure over a larger fraction of the ribbon volume enhancing the magnetic properties. {copyright} {ital 1998 American Institute of Physics.}

• OSTI ID: 627980
• Report Number(s): CONF-980102--
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 11 Vol. 83; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
BORON ALLOYS
COERCIVE FORCE
FERROMAGNETIC MATERIALS
GRAIN SIZE
IRON ALLOYS
MICROSTRUCTURE
NEODYMIUM ALLOYS
SPIN-ON COATING
TITANIUM CARBIDES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION