Constitution of melt-spun NdFeB-magnets studied by analytical field ion microscopy

Journal Article · Tue Jan 01 04:00:00 EST 1991 · Acta Metallurgica; (United States)

DOI:https://doi.org/10.1016/0956-7151(91)90323-S· OSTI ID:7030630

Hutten, A; Haasen, P ^[1]

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1. Inst. fur Metallphysik, Univ. Gottingen, and Sonderforschungsbereich 126, D-3400 Gottingen (DE)

An analytical field ion microscope was applied to melt-spun NdFeB magnets with various cobalt substitutions. The microstructure of melt-spun NdFeB magnets consists of three phases. Whereas the Nd{sub 2}Fe{sub 14}B- and the metastable Nd{sub 7}Fe{sub 3}-phase determine the magnetic properties of optimally quenched specimens the Nd{sub 1.1}Fe{sub 4}B{sub 4}-phase additionally influences the magnetic behavior of over-quenched and annealed material. With Co substitution the Nd-rich phase transforms via the metastable Nd{sub 23}(Fe{sub 1{minus}x}Co{sub x}){sub 75}B{sub 2} intermediate stage of optimally quenched specimens to the stable Nd(Fe{sub 1{minus}x}Co{sub x}){sub 2}-phase in over-quenched and annealed ribbons. In this paper, from experimental data the authors conclude that a nucleation model of coercivity is consistent with the magnetic measurements.

• OSTI ID: 7030630
• Journal Information: Acta Metallurgica; (United States), Journal Name: Acta Metallurgica; (United States) Vol. 39:1; ISSN 0001-6160; ISSN AMETA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALLOYS
ANNEALING
BORIDES
BORON COMPOUNDS
COBALT ADDITIONS
COBALT ALLOYS
CRYSTAL STRUCTURE
FLUIDS
HEAT TREATMENTS
ION MICROSCOPY
IRON BORIDES
IRON COMPOUNDS
LIQUIDS
MAGNETS
MATERIAL SUBSTITUTION
MELTING
MICROSCOPY
MICROSTRUCTURE
NEODYMIUM BORIDES
NEODYMIUM COMPOUNDS
NUCLEATION
OPTIMIZATION
PHASE TRANSFORMATIONS
QUENCHING
RARE EARTH COMPOUNDS
TRANSITION ELEMENT COMPOUNDS