Magnetic properties of Sm(Fe,Ti)7CxNδ/α-Fe nanocomposites

Dian yu Geng, Zhi dong Zhang, Wei Liu, Xin guo Zhao, Cai yin You, Ming hui Yu, Qun feng Xiao, R. Grössinger, J. P. Liu, D. J. Sellmyer

Research output: Contribution to journalArticle

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Abstract

The structure, phase transformation and magnetic properties of SmyFe93-y-zTizC7 Nδ (y=8, 10, 12, 14; z=0, 3, 5, 7) alloys prepared by mechanical alloying (MA) and nitrogenation have been studied. The main phase in the alloys transforms from Nd2Fe14B-type to TbCu7-type when the Ti content is increased. The magnetic properties of SmyFe93-y-zTizC7 alloys are improved by nitriding, which is sensitive to the nitriding temperature. The hard magnetic properties of the MA SmyFe93-y-zTizC7 Nδ alloys are better than those of the carbon-free counterparts due to the formation of Sm(Fe,Ti)7CxNδ/α-Fe nanocomposite. The Sm12Fe74Ti7C7 alloy, annealed at 850°C for 30 min and nitrided at 400°C for 5 h, has the magnetic properties iHc=38.5 kOe and (BH)max=8.84 MGOe. The re-milling process before nitrogenation is beneficial to achieving the magnetic properties of iHc=6.87 kOe and (BH)max=13.5 MGOe for Sm10Fe76Ti7C7 Nδ alloys.

Original languageEnglish (US)
Pages (from-to)259-263
Number of pages5
JournalJournal of Alloys and Compounds
Volume329
Issue number1-2
DOIs
Publication statusPublished - Nov 14 2001

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Keywords

  • Interstitial alloys
  • Mechanical alloying
  • Nanostructured materials
  • Permanent magnets
  • Rare earth compounds

ASJC Scopus subject areas

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

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