Preparation of nanocrystalline Mn-Al-C magnets by melt spinning and subsequent heat treatments

E. Fazakas, L. K. Varga, F. Mazaleyrat

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Mn54Al44C2 ribbon samples have been prepared by melt spinning in a single-phase ε hexagonal disordered state and its exothermal transformation at around 500 °C into a tetragonal L10 type magnetic structure (τ-phase) was followed by DTA, DSC, X-ray diffraction and thermomagnetic measurements. The metastable τ-phase stabilized by carbon addition could be transformed reversibly into the ε-phase at around 800 °C, without decomposition into the stable Al8Mn5 and β manganese phases. The almost constant Curie temperature obtained for partially transformed two-phase samples indicated a compositionally invariant transformation. By grinding the thin (25 μm) ribbon into sub-millimeter flakes, a bulk anisotropic magnet could be compacted by magnetic field oriented powder technology.

Original languageEnglish
Pages (from-to)611-613
Number of pages3
JournalJournal of Alloys and Compounds
Volume434-435
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - May 31 2007

Keywords

  • Liquid quenching
  • Magnetic measurements
  • Permanent magnets
  • Thermal analysis
  • X-ray diffraction

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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