Magnetic and Microstructural Aspects of the Bulk Metallic Glassy Materials Nd60Fe30Al10

Abstract

The ferromagnetic bulk metallic glass (BMG) Nd60Fe30Al10 system exhibits extremely large coercivities at low temperature and moderate coercivities near room temperature. The magnetic hardness, as best evidenced by the onset of magnetic irreversibility, was studied in bulk suction-cast and melt-spun alloys with the nominal composition Nd60Fe30Al10. Systematic x-ray diffraction studies of the degree of crystallinity performed as a function of position within the bulk suction-cast samples is found to correlate with the variation in the room-temperature magnetic hysteresis character. X-ray diffraction data clearly shows the presence of both crystallites and amorphous material on the samples' outmost surfaces; the amorphous phase content increases with distance into the cast sample. These results underscore the importance of solidification conditions and attendant nanophase selection, on the resultant magnetic properties of this class of alloys.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 2001
Accession Number
ADP012289

Entities

People

  • N. Chau
  • N. H. Dan
  • N. M. Hong
  • N.X. Phuc
  • V. H. Ky

Organizations

  • Iowa State University

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Amorphous Materials
  • Biomedical And Dental Materials
  • Coercivity
  • Diffraction
  • Diffraction Analysis
  • Energy
  • Engineered Materials
  • Engineering
  • Magnetic Fields
  • Magnetic Properties
  • Materials
  • Materials Engineering
  • Materials Science
  • Measurement
  • Phase Diagrams
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Materials science
  • Physics

Readers

  • Plasma Physics / Magnetohydrodynamics
  • Powder metallurgy of Titanium alloys.
  • Thin Film Deposition Science.