Micro-lateral extrusion of Zr₅₅Cu₃₀Al₁₀Ni₅bulk metallic glass under low-frequency vibration loading

Abstract

Abstract. The effect of vibration on the micro-forming ability of Zr 55 Cu 30 Al 10 Ni 5 bulk metallic glass in its supercooled liquid region was studied. The experiment of microextrusion was carried out under different amplitude (38 ∼ 760 N) and different frequency (0.1 ∼ 2.0 Hz) at a fixed temperature of 723 K. The extrusion length was taken as a measure to characterize the micro-forming ability. Results reveal that the extrusion length of bulk metallic glass is effectively improved under vibration loading, and increases with increasing loading frequency and amplitude, whereas the frequency dependence is stronger. The viscosity of bulk metallic glass declines under vibration loading because of a larger free volume concentration and surface effect caused by vibration. This research indicates that the vibration forming is an effective method to enhance the micro-forming ability of bulk metallic glasses.