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

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.
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [5]
  1. Department of Mechanical and Materials Engineering, University of Nebraska, Lincoln, Nebraska 68588 (United States)
  2. (United States)
  3. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354 (United States)
  4. Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588 (United States)
  5. Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354 (United States)
Publication Date:
OSTI Identifier:
22278077
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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