Influence of melt temperature on the Invar effect in (Fe71.2B24Y4.8)96Nb4bulk metallic glass

Q. Hu, H. C. Sheng, Mingwang Fu, X. R. Zeng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)

Abstract

The influence of melt temperature on the glass formation, physical properties and local structure of (Fe71.2B24Y4.8)96Nb4bulk metallic glass (BMG) was investigated through X-ray diffractometry, differential scanning calorimetry, thermal dilatation, and Mössbauer spectra tests. Amorphous alloys were formed by fast cooling of the melt from the temperature range of 1573-1773 K. BMG cast from 1623 K has lower Curie temperature and larger spontaneous volume magnetostriction, i.e., stronger Invar effect. The abnormality, which can not be eliminated by annealing, is attributed to the higher amount of Fe-Fe pairs indicated by the hyperfine field distribution. This special local structure is inherited from the melt, which has a liquid-liquid change manifested by an exothermic step region at the temperature range of 1615-1650 K. Through a slow-cooling process, the melt in the liquid-liquid change is frozen to a crystalline structure contained Y2Fe17phase with a high intensity signal. These findings help explain the correlation between the liquid-liquid change and the structure of cooling products.
Original languageEnglish
Pages (from-to)6900-6906
Number of pages7
JournalJournal of Materials Science
Volume49
Issue number20
DOIs
Publication statusPublished - 1 Jan 2014

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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