4.7 Article Proceedings Paper

Effects of B addition on the microstructure and magnetic properties of Fe-Co-Mo alloys

Journal

JOURNAL OF ALLOYS AND COMPOUNDS
Volume 766, Issue -, Pages 649-655

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.06.368

Keywords

Fe-Co-Mo alloy; Precipitation; Magnetic materials; Melt-spinning; Antioxidant ability

Funding

  1. Natural Science Foundation of Fujian Province of China [2017J01477, 2016J01215]
  2. Joint Research Fund for Industry and University of Fujian Province [2017H6016]
  3. State Scholarship Fund of China Scholarship Council [201306655001]
  4. National Natural Science Foundation of China [51501040, 51401087]
  5. DOE BES [DE-FG02-04ER4612]
  6. China Post-doctoral Science Foundation [2016M590591]

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The microstructure, precipitation hardening and magnetic properties of melt-spun Fe78Co11Mo11 and Fe74Co11Mo11B4 alloys were studied. It is shown that B addition increases the precipitation reaction temperature of the supersaturated matrix from 605 degrees C for the Fe78Co11Mo11 alloy to 640 degrees C for the Fe74Co11Mo11B4 alloy. In the Fe78Co11Mo11 alloy, a cotton-shaped (Fe, Co)(7)Mo-6 precipitate is observed inside the grains of the matrix phase. In the Fe74Co11Mo11B4 alloy, in addition to the (Fe, Co)(7)Mo-6 phase, spherical MoB2 precipitates are also observed. Compared to the Fe78Co11Mo11 sample, the Fe74Co11Mo11B4 sample exhibits a finer and more homogeneous microstructure with more equiaxed grains. This finer microstructure explains the enhanced hard magnetic properties in the Fe74Co11Mo11B4 sample (M-r = 60.4 Am-2/kg, H-i(c) = 20.8 kA/m) compared to those of the Fe78Co11Mo11 sample (M-r = 56.5 Am-2/kg, H-i(c) = 17.3 kA/m). Furthermore, the Fe74Co11Mo11B4 sample shows better antioxidant ability than the Fe78Co11Mo11 sample, especially when the temperature exceeds 400 degrees C. (C) 2018 Elsevier B.V. All rights reserved.

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