Effect of Au content on thermal stability and mechanical properties of Au-Cu-Ag-Si bulk metallic glasses

H. Guo, W. Zhang, M. W. Chen, Y. Saotome, M. Fukuhara, A. Inoue

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The thermal stability, glass-forming ability (GFA), and mechanical and electrical properties of Au-based Au x Si17Cu 75.5-x Ag7.5 (x = 40 to 75.5 at. pct) metallic glasses were investigated. The glass transition temperature (T g ) and crystallization temperature (T x ) decreased with increasing Au content. The ultralow T g values below 373 K (100 °C) were obtained for alloys with x = 55 to 75.5. The alloys with x = 45 to 70 exhibited a high stabilization of supercooled liquid and a high GFA, and the supercooled liquid region and critical sample diameter for glass formation were in the range of 31 K to 50 K and 2 to 5 mm, respectively. The compressive fracture strength (σ c,f ), Young's modulus (E), and Vicker's hardness (H v ) of the bulk metallic glasses (BMGs) decreased with increasing Au content. A linear correlation between Au concentration and the characteristic temperature, i.e., T g and T x, and mechanical properties, i.e., σ c,f, E, and H v, as well as electrical resistivity can be found in the BMGs, which will be helpful for the composition design of the desirable Au-based BMGs with tunable physical properties.

Original languageEnglish
Pages (from-to)1486-1490
Number of pages5
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume42
Issue number6
DOIs
Publication statusPublished - 2011 Jun
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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