Microstructure feature of bulk glassy Cu60Zr30Ti10 alloy in as-cast and annealed states

Yantang Chen, Tao Zhang, Wei Zhang, Dehai Ping, K. Hono, Akihisa Inoue, Toshio Sakurai

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

The microstructures of a bulk glassy Cu60Zr30Ti10 alloy in as-cast state and annealed at glass transition temperature (Tg), i.e., 440°C, have been studied using an electron transmission microscope (TEM) and a high-resolution transmission electron microscope (HRTEM). Nanocrystals with a size of 4 nm were observed in the cast rod with a diameter of 4 mm. The nanocrystal was determined to be CuZr, which is primitive cubic structure with a lattice parameter of a = 0.3262 nm by analyzing its nano-beam electron diffraction pattern, suggesting that such nanocrystals have a positive effect on mechanical properties. Obviously distinguished interval dark and bright regions were observed in the glassy Cu60Zr30Ti10 alloy annealed for 10 min at Tg. Nanocrystalline phase with a size of ∼ 10 nm was recognized after the annealing treatment. The concentration distribution of Cu, Zr and Ti in the alloy annealed for 10 min at Tg was examined with a three-dimensional atom probe field ion microscopy (3DAP-FIM). It was found that the Cu and Zr elements fluctuated along depth direction while the Ti element remained almost unchanged. It is therefore interpreted that the annealing-induced nanocrystalline phase results from nucleation and growth at the sites of the Cu-rich and/or Zr-rich regions as well as from growth of the cast-in nanocrystals.

Original languageEnglish
Pages (from-to)2647-2650
Number of pages4
JournalMaterials Transactions
Volume43
Issue number10
DOIs
Publication statusPublished - 2002 Oct
Externally publishedYes

Keywords

  • Anneal
  • Cast
  • Glass transition temperature
  • Glassy CuZrTi alloy
  • Microstructure

ASJC Scopus subject areas

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

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