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Bulk glass formation and mechanical properties for Cu–Hf–Ti–M (M = B,Y) alloys

Authors
Journal
Journal of Non-Crystalline Solids
0022-3093
Publisher
Elsevier
Publication Date
Volume
353
Identifiers
DOI: 10.1016/j.jnoncrysol.2006.12.068
Keywords
  • Amorphous Metals
  • Metallic Glasses
  • Alloys
  • Liquid Alloys And Liquid Metals
  • Transition Metals
  • Mechanical Properties
  • Hardness
  • Indentation
  • Microindentation
  • Short-Range Order

Abstract

Abstract The glass forming ability (GFA), nanohardness H n and Young’s modulus E of ternary alloys in the compositional series Cu 60Hf 40− x Ti x ( x = 5–35) are reported and discussed. Bulk glass formation was observed for the three alloys x = 17.5, 20 and 22.5, with critical rod diameters d c for a fully glassy structure of 4, 4 and 3 mm, respectively. A d c of 4 mm was also observed for the Cu 55Hf 25Ti 20 alloy. These compositions generally had the highest values of reduced glass temperature while no correlation was observed between the GFA and the parameter Δ T x . Both H n and E surprisingly showed minima at ∼20 at.%Ti for the Cu 60Hf 40− x Ti x series. The addition of 1 at.%B or Y to the Cu 60Hf 22.5Ti 17.5 alloy slightly decreased the GFA but slightly increased the elastic modulus.

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