Formation and mechanical properties of bulk Cu-Ti-Zr-Ni metallic glasses with high glass forming ability

来源期刊：中国有色金属学报(英文版)2007年第1期

论文作者：杨英俊 康福伟 邢大伟 孙剑飞 沈庆克 沈军

文章页码：16 - 20

Key words：bulk metallic glass; glass forming ability; mechanical property; adiabatic heating

Abstract: Bulk amorphous Cu_52.5Ti₃₀Zr_11.5Ni₆ and Cu_53.1Ti_31.4Zr_9.5Ni₆ alloys with a high glass forming ability can be quenched into single amorphous rods with a diameter of 5 mm, and exhibit a high fracture strength of 2 212 MPa and 2 184 MPa under compressive condition, respectively. The stress—strain curves show nearly 2% elastic strain limit, yet display no appreciable macroscopic plastic deformation prior to the catastrophic fracture due to highly localized shear bands. The present work shows clearly evidence of molten droplets besides well-developed vein patterns typical of bulk metallic glasses on the fracture surface, suggesting that localized melting induced by adiabatic heating may occur during the final failure event.