High strain rate induced embrittlement of Zr-based bulk metallic glass
(1.黑龙江省哈尔滨市哈尔滨工业大学材料科学与工程学院2.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)
Abstract: Quasi-static and high strain rate mechanical behavior of the Zr1.25Ti13.75Ni10Cu12.5Be22.5 bulk metallic glass was determined covering strain rates from 1.02×10-4s-1 to 3.258×103s-1. By use of split hopkinson pressure bar(SHPB) equipment, it is found that the alloy fractures in the high strain rate period with a strength well below that of its quasi-static counterpart and thus a strain rate induced embrittlement happens. Considering the glassy nature of the alloy and with careful analysis of the fracture morphology, dynamic damage accumulated in the high speed deformation period is suggested to be the reason for this embrittlement.
Key words: bulk metallic glass； SHPB； high strain rate； embrittlement