Magnetic properties of Sm : (Co,Cu) alloys. I. Electron microscopy

Journal Article · Tue Jun 01 04:00:00 EDT 1976 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.322988· OSTI ID:7355391

Melton, K N; Perkins, R S

The effect of aging on the microstructures of Sm-Co-Cu alloys is reported. It is shown that small precipitates are present within the SmCo/sub 5/-type phase in as-cast material. On aging below 650 degreeC these precipitates are exceptionally stable, but at 800 degreeC they coarsen rapidly. These results are rationalized in terms of a coherent precipitate phase boundary. Macroscopic regions of the Sm/sub 2/Co/sub 17/-type phase contain twins and antiphase domain boundaries. The density of these defects is considerably altered by heat treatment. The observed structures are related to the magnetic properties of the alloys concerned, and in Part II a theory is developed to explain the coercivity mechanisms. (AIP)

• Research Organization: Brown Boveri Research Center, CH-5401 Baden, Switzerland
• OSTI ID: 7355391
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 47:6; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
AGING
ALLOYS
COBALT ALLOYS
COBALT BASE ALLOYS
COPPER ALLOYS
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
HEAT TREATMENTS
MAGNETS
MICROSCOPY
MICROSTRUCTURE
PERMANENT MAGNETS
PHASE STUDIES
PRECIPITATION
RARE EARTH ALLOYS
SAMARIUM ALLOYS
SEPARATION PROCESSES
TWINNING