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Microstructure of multistage annealed nanocrystalline SmCo{sub 2}Fe{sub 2}B alloy with enhanced magnetic properties

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.4865298· OSTI ID:22278077
;  [1];  [2];  [3];  [4]
  1. Department of Mechanical and Materials Engineering, University of Nebraska, Lincoln, Nebraska 68588 (United States)
  2. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354 (United States)
  3. Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588 (United States)
  4. Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354 (United States)
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The microstructure and chemistry of SmCo{sub 2}Fe{sub 2}B melt-spun alloy after multistage annealing was investigated using high resolution transmission electron microscopy (HRTEM) and 3D atom probe tomography. The multistage annealing resulted in an increase in both the coercivity and magnetization. The presence of Sm(Co,Fe){sub 4}B (1:4:1) and Sm{sub 2}(Co,Fe){sub 17}B{sub x} (2:17:x) magnetic phases were confirmed using both techniques. Fe{sub 2}B at a scale of ∼5 nm was found by HRTEM precipitating within the 1:4:1 phase after the second-stage annealing. Ordering within the 2:17:x phase was directly identified both by the presence of antiphase boundaries observed by TEM and the interconnected isocomposition surface network found in 3D atom probe results in addition to radial distribution function analysis. The variations in the local chemistry after the secondary annealing were considered pivotal in improving the magnetic properties.

OSTI ID:
22278077
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 6 Vol. 115; ISSN JAPIAU; ISSN 0021-8979
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
ANNEALING
COBALT COMPOUNDS
COERCIVE FORCE
CRYSTALS
IRON BORIDES
MAGNETIC PROPERTIES
MAGNETIZATION
MICROSTRUCTURE
NANOSTRUCTURES
PRECIPITATION
PROBES
SAMARIUM COMPOUNDS
SPATIAL DISTRIBUTION
SURFACES
TOMOGRAPHY
TRANSMISSION ELECTRON MICROSCOPY