Effect of Al on local structures of Zr-Ni and Zr-Cu metallic glasses

Shigeo Sato, Takashi Sanada, Junji Saida, Muneyuki Imafuku, Eiichiro Matsubara, Akihisa Inoue

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

Abstract

In order to investigate the role of Al on the thermal stability of supercooled liquid state, the local structures of Zr70M30 and Zr70M20Al10 (M = Ni, Cu) metallic glasses have been studied by the X-ray diffraction and EXAFS measurements. It is found that the different effect of Al substitution on the local structures around Cu and Ni elements is exhibited. No characteristic change is observed in the local structure in the Zr - Cu metallic glass by Al substitution, whereas a drastic change in the environment around Ni atom can be confirmed in the Zr - Ni metallic glass. That is, the coordination number of Zr around Ni decreases significantly by substitution of Al in the Zr - Ni metallic glass. This would be caused by the preferential correlation between Al and Zr. This result suggests that Al plays a dominant role on the formation of novel local structure with a decomposition of the tetragonal Zr2Ni-like local environment in the Zr - Ni binary alloy. We conclude that the novel local structure contributes to the stability of the supercooled liquid state in the Zr - Al - Ni metallic glass.

Original languageEnglish
Pages (from-to)2893-2897
Number of pages5
JournalMaterials Transactions
Volume46
Issue number12
DOIs
Publication statusPublished - 2005 Dec

Keywords

  • Extended X-ray absorption fine structure
  • Local structure
  • Radial distribution function
  • Zirconium-based metallic glass

ASJC Scopus subject areas

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

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