Synthesis and fundamental properties of Cu-based bulk glassy alloys in binary and multi-component systems

Akihisa Inoue, Wei Zhang, Junji Saida

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

A glassy phase containing cubic phase particles with a size of 3-5 nm was formed in cast Cu60Zr30Ti10 and Cu 60Hf30Ti10 bulk alloys. The cubic phase is in a metastable state and its lattice parameter (a0) is 0.45 nm for the former alloy and 0.51 nm for the latter. These bulk alloys exhibit good mechanical properties of 2000-2130MPa for tensile strength (σ t,f), 2060-2160MPa for compressive strength (σc,f) and 0.008-0.017 for compressive plastic strain (εc,p). The temperature interval of the supercooled liquid (SL) region prior to crystallization is 37 K for Cu60Zr30Ti10 and 67 K for Cu60Hf30Ti10. The primary crystallization occurred by precipitation of cubic CuZr (a0 = 0.35 nm) in a diffusion-controlled growth mode of nuclei and an orthorhombic Cu 8Hf3 phase in an interface diffusion-controlled growth of nuclei with decreasing nucleation rate. The difference in the precipitation modes is interpreted to be the origin of the difference in the SL region. Furthermore, the addition of Al to Cu-Zr and Cu-Hf alloys caused the formation of a glassy single phase in the rod form with diameters up to at least 3mm, though bulk glassy alloy rods with critical diameters up to 1.5mm and σc,f of 1920-2260MPa were formed in Cu-Zr and Cu-Hf binary systems. The ternary bulk glassy alloys exhibited high σc,f of 2100-2370 MPa with εc,p of 0.002-0.006. The addition of Pd, Pt, Ag or Au increased ΔTx and a large ΔTx of 102-110 K was obtained for the Cu-Hf-Al-M (M=Pd or Ag) glassy alloys. The synthesis of Cu-based bulk glassy alloys with good mechanical properties and large ΔTx in glassy single, and mixed glassy and cubic phase states, is important for future applications of bulk glassy alloys.

Original languageEnglish
Pages (from-to)1153-1162
Number of pages10
JournalMaterials Transactions
Volume45
Issue number4
DOIs
Publication statusPublished - 2004 Apr

Keywords

  • Bulk glassy alloy
  • Copper-based alloy
  • Crystallization
  • Mechanical property
  • Microstructure
  • Supercooled liquid
  • TEM

ASJC Scopus subject areas

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

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