Journal
JOURNAL OF MATERIALS SCIENCE
Volume 46, Issue 18, Pages 6065-6074Publisher
SPRINGER
DOI: 10.1007/s10853-011-5568-7
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Funding
- US Office of Naval Research/MURI [N00014-05-1-049]
- US DoD/DARPA/ARO [W911NF-08-1-0249]
- University of Texas-Arlington
- US Department of Energy, Office of Basic Energy Science [DE-AC02-07CH11358]
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Fabrication of bulk nanocomposite materials, which contain a magnetically hard phase and a magnetically soft phase with desired nanoscale morphology and composition distribution has proven to be challenging. Here we demonstrate that SmCo/Fe(Co) hard/soft nanocomposite materials can be produced by distributing the soft magnetic alpha-Fe(Co) phase particles homogenously in a hard magnetic SmCo phase matrix through a combination of high-energy ball milling and a warm compaction. Severe plastic deformation during the ball milling results in nanoscaling of the soft phase with size reduction from micrometers to similar to 15 nm. Up to 35% of the soft phase can be incorporated into the composites without coarsening. This process produces fully dense bulk isotropic nanocomposite materials with remarkable energy-product enhancement (up to 300%) owing to effective inter-phase exchange coupling.
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