Effect of thermal annealing on the local structure in ZrCuAl bulk metallic glass

Akito Ishii, Akihiro Iwase, Yuka Fukumoto, Yoshihiko Yokoyama, Toyohiko J. Konno, Fuminobu Hori

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The relaxation and crystallization behaviors of the ternary Zr 50Cu40Al10 bulk metallic glass were investigated by the positron annihilation measurements and the extended X-ray absorption fine structure (EXAFS) analysis at the Zr K-edge. The result of positron annihilation coincidence Doppler broadening (CDB) for as-prepared specimen suggests that the fraction of Zr atom around free volume is greater than that of composition for alloy system. According to the results of CDB spectrum and Fourier transformed EXAFS spectrum, the isothermal annealing below the glass transition temperature (Tg) (structural relaxation) decreases the size of free volume, but it causes little change in the distribution of atoms, either around free volume or around Zr atoms. For the isothermal annealing above crystallization temperature (Tx), the XRD and EXAFS spectra clearly show the crystallization of specimens. The CDB result also suggests the crystallization. These results demonstrate that the chemical order around free volume is dissociated, and crystallized order is newly formed during the thermal annealing above Tx.

Original languageEnglish
Pages (from-to)S230-S233
JournalJournal of Alloys and Compounds
Volume504
Issue numberSUPPL. 1
DOIs
Publication statusPublished - 2010 Aug 1

Keywords

  • Crystallization
  • EXAFS
  • Metallic glass
  • Positron annihilation spectroscopy
  • Structural relaxation
  • Thermal annealing effect

ASJC Scopus subject areas

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

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