Mechanically alloyed Sm-Co materials

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

DOI:https://doi.org/10.1063/1.347769· OSTI ID:5595995

Wecker, J; Katter, M; Schultz, L ^[1]

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1. Siemens AG, Research Laboratory, Erlangen, Germany (DE)

The preparation of SmCo{sub 5} magnets is based on a high-temperature heat treatment above 800 {degree}C followed by a rapid cooling to room temperature. By mechanical alloying and a subsequent heat treatment, it is possible for the first time to prepare hard magnetic SmCo{sub 5} powder at low temperatures. The process involves first the formation of an amorphous precursor during milling, which then is transformed to the 1:5 structure at temperatures above 500 {degree}C. The magnetically isotropic samples show a coercivity of 24 kA/cm and a remanence of 0.52 T. The process is also applicable to Sm{sub 2}Co{sub 17}. However, here the coercivity is less than 5 kA/cm and higher values require the formation of a precipitation-hardened microstructure. The stability of SmCo{sub 5} below 800 {degree}C questions the eutectoid decomposition into Sm{sub 2}Co{sub 17} and Sm{sub 2}Co{sub 7}.

• OSTI ID: 5595995
• 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
360101* -- Metals & Alloys-- Preparation & Fabrication
ALLOYS
ANNEALING
COBALT ALLOYS
COERCIVE FORCE
CRYSTAL STRUCTURE
HEAT TREATMENTS
MACHINING
MAGNETIC PROPERTIES
MICROSTRUCTURE
MILLING
PHYSICAL PROPERTIES
POWDERS
RARE EARTH ALLOYS
SAMARIUM ALLOYS