Magnetic and microstructure properties of iron-rare earth-boron magnets
The new generation of cobalt-free Fe-Nd-B permanent magnets have excellent hard magnetic properties attributed to a tetragonal Fe/sub 14/Nd/sub 2/B phase that has a high anisotropy and a high magnetic moment. The purpose of this work was to study the magnetic and microstructure properties of the iron-rare earth-boron based systems. The magnets were mostly made from heat-treated melt-spun samples. The addition of Co and Tb (Dy) in the Fe-Nd-B compounds enhances the relatively low Curie temperature and the coercivity, respectively. These outstanding hard magnetic properties find wide applications in industry. Partial substitution of boron by other metalloids (Si, C, P) leads to a substantial decrease in properties of hard magnetic materials and to a substantial decrease in Curie temperature. The spin-reorientation temperature in Fe-Nd-B alloys was found to drop drastically with partial substitution of Fe by Ni, Mn and B by C, Si. The origin of high coercivity was examined by correlating the hard magnetic properties with the microstructure. The high coercivities can be explained by domain wall pinning at grain boundaries.
- Research Organization:
- Kansas State Univ., Manhattan (USA)
- OSTI ID:
- 5256472
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102 -- Metals & Alloys-- Structure & Phase Studies
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
BORON ALLOYS
COBALT ADDITIONS
COBALT ALLOYS
COERCIVE FORCE
CRYSTAL STRUCTURE
ELEMENTS
IRON ALLOYS
MAGNETIC PROPERTIES
MAGNETS
MATERIAL SUBSTITUTION
MICROSTRUCTURE
NEODYMIUM ALLOYS
PERMANENT MAGNETS
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SEMIMETALS