Magnetic hardening in as-cast Nd-rich Nd-Fe-B magnets

Journal Article · Mon Apr 15 04:00:00 EDT 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.347860· OSTI ID:5493200

Singleton, E W; Tsoukatos, A; Zhang, Y; Hadjipanayis, G C ^[1]

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1. Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 (USA)

The microstructure of as-cast Nd-rich Nd-Fe-B alloys has been studied in detail and correlated with their magnetic hysteresis behavior. A hard magnetic phase with a Curie temperature around 250 {degree}C and a coercivity of 5.2 kOe has been observed in an arc-melted Nd{sub 80}Fe{sub 15}B{sub 5} sample. Annealing at around 600 {degree}C led to a transformation of this phase to Nd{sub 2}Fe{sub 14}B which is present in the form of small crystallites randomly disbributed in a nonmagnetic Nd-rich matrix, resulting in coercivities greater than 14 kOe. The Stoner and Wohlfarth model of single domain particles has been used to discuss the large coercivities.{lt}lz{gt} {lt}lz{gt} {lt}lz{gt} {lt}lz{gt} {lt}lz{gt} {lt}lz{gt}

• OSTI ID: 5493200
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:8; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
BORON ALLOYS
COERCIVE FORCE
CRYSTAL STRUCTURE
CURIE POINT
DOMAIN STRUCTURE
HYSTERESIS
IRON ALLOYS
MAGNETIC PROPERTIES
MAGNETIZATION
MAGNETS
MICROSTRUCTURE
NEODYMIUM ALLOYS
PERMANENT MAGNETS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE