Constitution of melt-spun NdFeB-magnets studied by analytical field ion microscopy
Creators
- 1. Inst. fur Metallphysik, Univ. Gottingen, and Sonderforschungsbereich 126, D-3400 Gottingen (Germany)
Description
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 Nd2Fe14B- and the metastable Nd7Fe3-phase determine the magnetic properties of optimally quenched specimens the Nd1.1Fe4B4-phase additionally influences the magnetic behavior of over-quenched and annealed material. With Co substitution the Nd-rich phase transforms via the metastable Nd23(Fe1-xCox)75B2 intermediate stage of optimally quenched specimens to the stable Nd(Fe1-xCox)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
Additional details
Publishing Information
- Journal Title
- Acta Metallurgica et Materialia
- Journal Volume
- 39
- Journal Issue
- 1
- Journal Page Range
- p. 1-12.
- ISSN
- 0956-7151
- CODEN
- AMATEB
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 24022025
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- ANNEALING; COBALT ADDITIONS; ION MICROSCOPY; IRON BORIDES; LIQUIDS; MAGNETS; MELTING; MICROSTRUCTURE; NEODYMIUM BORIDES; NUCLEATION; OPTIMIZATION; QUENCHING
- Descriptors DEC
- BORIDES; BORON COMPOUNDS; CRYSTAL STRUCTURE; EQUIPMENT; FLUIDS; HEAT TREATMENTS; IRON COMPOUNDS; MICROSCOPY; NEODYMIUM COMPOUNDS; PHASE TRANSFORMATIONS; RARE EARTH COMPOUNDS; TRANSITION ELEMENT COMPOUNDS