Article ID Journal Published Year Pages File Type
1486659 Journal of Non-Crystalline Solids 2005 12 Pages PDF
Abstract

The effect of strain rate on the initiation and propagation of shear bands in the Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass under shear loading was investigated. The quasi-static (at a strain rate of 1.5 × 10−3 s−1) and the dynamic shear tests (at a strain rate of 1.4 × 103 s−1) were conducted at room temperature using a GATAN Microtest-2000 instrument and a split Hopkinson pressure bar (SHPB) with a specially designed ‘Plate-shear’ specimen, respectively. The complete process of shear band initiation, propagation, and shear band unstable propagation-induced fracture was revealed. The experimental results demonstrated that the macroscopic shear strength is relatively insensitive to the strain rate, whereas shear band initiation and fracture are significantly dependent on strain rate. A dimensionless Deborah number was introduced to characterize the effect of the strain rate on the formation of shear bands. Additionally, the observed numerous liquid droplets and melted belts on the fracture surface at high-strain rates demonstrate that the adiabatic heating exerts a significant effect on fracture behavior of the material.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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