High glass forming ability and good mechanical properties of Cu–Zr–Al bulk metallic glasses

Abstract

For developing bulk metallic glasses with high glass forming ability (GFA) and good mechanical properties, Cu 922x Zr x Al 8 (x535-65 at-%) alloys have been studied by means of tilt mould casting method. The largest glassy rod with a critical diameter of 18 mm in this alloy series was obtained for Cu 42 Zr 50 Al 8 alloy. The Hruby factor is appropriate for evaluating GFA in the cast Zr-Cu-Al bulk glassy alloy. The bulk metallic glasses with high GFA exhibit good mechanical properties, i.e. compressive fracture strength of 1783-2240 MPa, Young's modulus of 90-123 GPa and plastic strain of 0-0?73%.

Structural Correlation of the Glass‐Forming Ability in a Cu–Zr‐Based Metallic Glass: A Molecular Dynamics Study

“…However, we can see that the highest T g is observed for the Cu 44 Zr 52 Al 4 and Cu 40 Zr 47 Al 13 , indicating that, within the same cooling rate, these alloys form glassy state before the Cu 42 Zr 50 Al 8 alloy. This is inconsistent with the experimental study of Zhou et al [ 28 ] who showed on the basis of an examination of GFA and mechanical properties of Cu 92– x Zr x Al 8 ( x = 35–65 at%) alloys that the best glass former is Cu 42 Zr 50 Al 8 with a unique combination of mechanical properties including elastic Young's modulus of 90–123 GPa, compressive fracture strength of almost 1783–2240 MPa, and finally plastic strain ranging from 0 to 0.73%.…”