Free volume relaxation process in Zr50Cu40Al 10 bulk metallic glass studied by positron annihilation techniques

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Structural relaxation around free volume in Zr50Cu 40Al10 bulk metallic glass (BMG) during isothermal annealing at 473, 573 and 673 K which are below glass transition temperature Tg = 675 K have been investigated by positron annihilation lifetime (PAL) and coincidence Doppler broadening (CDB) measurements. The trend of change in positron lifetime, which corresponds to the size of free volume at each annealing temperature, has a good correlation with their density change. These annealing processes obey a stretched exponential relaxation function (KWW: Kohlrausch-Williams-Watts law). The relaxation time t0 and β, used as adjustable parameters in the KWW function, were determined at each temperature. These relaxation parameters depend on the annealing temperature, suggesting the distribution of activation energy for structural relaxation. Moreover, the profile of the electron momentum distribution around free volume derived from CDB spectra during annealing showed no appreciable change at each temperature. These facts suggest that long range chemical ordering, particularly around the free volume, dose not take place essentially.

Original languageEnglish
Title of host publicationBulk Metallic Glasses - 2007
Pages101-106
Number of pages6
Publication statusPublished - 2008 Dec 1
Event2007 MRS Fall Meeting - Boston, MA, United States
Duration: 2007 Nov 262007 Nov 30

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1048
ISSN (Print)0272-9172

Other

Other2007 MRS Fall Meeting
CountryUnited States
CityBoston, MA
Period07/11/2607/11/30

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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