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

研究成果: Conference contribution

3 被引用数 (Scopus)

抄録

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.

本文言語English
ホスト出版物のタイトルBulk Metallic Glasses - 2007
ページ101-106
ページ数6
出版ステータスPublished - 2008
イベント2007 MRS Fall Meeting - Boston, MA, United States
継続期間: 2007 11 262007 11 30

出版物シリーズ

名前Materials Research Society Symposium Proceedings
1048
ISSN(印刷版)0272-9172

Other

Other2007 MRS Fall Meeting
国/地域United States
CityBoston, MA
Period07/11/2607/11/30

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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