Drastic increase in the toughness of structural relaxed hypoeutectic Zr59Cu31Al10 bulk glassy alloy

Yoshihiko Yokoyama, Tohru Yamasaki, Masahiko Nishijima, Akihisa Inoue

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


In order to improve embrittlement phenomena by structural relaxation, Zr-enriched hypoeutectic Zr-Cu-Al bulk glassy alloys (BGAs) were examined. During annealing for structural relaxation, the density increases significantly with annealing time from 103 s, and apparent saturation is seen at approximately 5.4 ks. Hardness and tensile strength do not change remarkably with annealing temperature. However, the Charpy impact value increases significantly by annealing at 648 K for 5.4 ks. The tendency of distinct increase of the Charpy impact value is maximized at Zr59Cu 31Al10 in hypoeutectic Zr-Cu-Al BGAs. A drastic increase in the Charpy impact value is accompanied by an increase in nonlinear density with increasing annealing temperature. Furthermore, the mechanical properties of fully structural relaxed Zr59Cu31Al10 BGAs are characterized by their superior shear band formation and branching ability, which can be estimated by the shear slip width before shear bandopening.

Original languageEnglish
Pages (from-to)1276-1281
Number of pages6
JournalMaterials Transactions
Issue number6
Publication statusPublished - 2007 Jun


  • Charpy impact value
  • Density change
  • Hypoeutectic composition
  • Shear slip width
  • Structural relaxation
  • Zirconium-copper-aluminum bulk glassy alloy

ASJC Scopus subject areas

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


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