Effects of chemical composition on the structural relaxation in ternary Zr-Cu-Al bulk glassy alloys studied by EXAFS and positron annihilation techniques

A. Ishii, S. Mineno, A. Iwase, Y. Yokoyama, T. J. Konno, F. Hori

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

Abstract

Mechanical properties and thermal stability of bulk glassy alloys depend on their chemical composition ratios, although their detailed local structures especially around free volume have not been clarified yet. In order to know the origin of property dependence on alloy composition in Zr-Cu-Al ternary bulk glassy alloys in a view point of atomic scale, positron annihilation lifetime, coincidence Doppler broadening (CDB) and EXAFS (extended X-ray absorption fine structure) measurements have been employed for eutectic Zr 50Cu 40Al 10 and hypoeutectic Zr 60Cu 30Al 10 bulk glassy alloys before and after structural relaxation by annealing below glass transition temperature T g. The result of CDB experiment, which represents the electron momentum distribution around free volume, shows that significant atomic reordering around free volume does not take place by the annealing in each alloy. Besides, CDB ratio profiles for each alloy suggest that the fraction of Zr atom around free volume does not match the chemical composition of each alloy system. Change in positron lifetime, which is proportional to the size of free volume, during annealing for hypoeutectic alloy almost remains unchanged.

Original languageEnglish
Title of host publicationBulk Metallic Glasses and their Applications
Pages84-89
Number of pages6
DOIs
Publication statusPublished - 2011
Event2010 MRS Fall Meeting - Boston, MA, United States
Duration: 2010 Nov 292010 Dec 3

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1300
ISSN (Print)0272-9172

Other

Other2010 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston, MA
Period10/11/2910/12/3

ASJC Scopus subject areas

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

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