Microstructural characterization of high energy product Nd-Fe-B rapidly solidified ribbons

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Description

The bonded Nd-Fe-B market has experienced the fastest growth of any permanent magnet market. Rapidly solidified Nd-Fe-B forms the basis for this bonded magnet industry. Rapid solidification is carried out by melt spinning, producing a highly stable and magnetically hard microstructure. This study focuses on a microstructural analysis of this melt spun ribbon using transmission and scanning electron microscopy (TEM and SEM), atom probe field ion microscopy (APFIM) and Auger electron spectroscopy (AES). The ribbons showed a uniform grain size and shape distribution through the thickness of the melt spun ribbon. Grain sizes ranged from 20 to 40 nm. AES ... continued below

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8 p.

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Horton, J.A.; Miller, M.K.; Heatherly, L.; Jones, J.W.; Russell, K.F. & Panchanathan, V. November 1, 1998.

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Description

The bonded Nd-Fe-B market has experienced the fastest growth of any permanent magnet market. Rapidly solidified Nd-Fe-B forms the basis for this bonded magnet industry. Rapid solidification is carried out by melt spinning, producing a highly stable and magnetically hard microstructure. This study focuses on a microstructural analysis of this melt spun ribbon using transmission and scanning electron microscopy (TEM and SEM), atom probe field ion microscopy (APFIM) and Auger electron spectroscopy (AES). The ribbons showed a uniform grain size and shape distribution through the thickness of the melt spun ribbon. Grain sizes ranged from 20 to 40 nm. AES showed neodymium enrichment on a fracture surface and corresponding iron and boron depletion suggesting that the eutectic 70Nd-30Fe phase is present with a thickness of approximately 1 nm. Atom probe composition analysis of grain interiors gave results very close to the nominal composition and some preliminary evidence of a grain boundary phase.

Physical Description

8 p.

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INIS; OSTI as DE99000360

Source

  • Symposium on microstructure and microscopy of magnetic materials, Ames, IA (United States), 14-15 May 1998

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  • Other: DE99000360
  • Report No.: ORNL/CP--98593
  • Report No.: CONF-9805121--
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/676878 | External Link
  • Office of Scientific & Technical Information Report Number: 676878
  • Archival Resource Key: ark:/67531/metadc709945

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • November 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Jan. 25, 2016, 6:47 p.m.

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Horton, J.A.; Miller, M.K.; Heatherly, L.; Jones, J.W.; Russell, K.F. & Panchanathan, V. Microstructural characterization of high energy product Nd-Fe-B rapidly solidified ribbons, report, November 1, 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc709945/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.