Viscous Flow Behavior and Workability of Mg-Cu-(Ag)-Gd Bulk Metallic Glasses

Abstract

The thermomechanical properties and viscous flow behaviors of the Mg₆₅Cu_25−xAg_xGd₁₀ (x=0, 3, 10 at%, namely, Mg₆₅Cu₂₅Gd₁₀, Mg₆₅Cu₂₂Ag₃Gd₁₀, and Mg₆₅Cu₁₅Ag₁₀Gd₁₀) bulk metallic glasses in the supercooled viscous region under the loading condition were investigated using the thermomechanical analyzer. In this study, the supercooled viscous temperature windows, the minimum viscosity, the fragility parameter, and the deformability parameter would all be degraded with increasing Ag addition, leading to the negative factors for the micro-forming and nano-imprinting practices. The base Mg₆₅Cu₂₅Gd₁₀ alloy appears to be more promising than the Ag containing alloys when the viscous forming is under consideration.