|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XV
||Shear-band Thickness and Cavitation in a Zr-based Metallic Glass
||Chaoyang Liu, Vladimir Roddatis, Peter Kenesei, Robert Maass
|On-Site Speaker (Planned)
Bulk metallic glasses deform inhomogeneously at low homologous temperatures via shear banding. In this contribution, we focus on the structure of a system-spanning shear band that had carried all plastic strain. We use HAADF-STEM and high-energy x-ray tomography to trace the shear-band structure along its path through the bulk sample. It is found that both the shear-band thickness, as well as the density changes relative to the matrix, are strongly dependent on position. The single shear band reveals a wide distribution of shear-band thickness (10-210 nm) and density reductions up to 12%. No distinct correlation between these two measures can be established. More than 100 micron-sized cavities are found in the tomographic reconstruction, presumably defining the shear-band plane inside the sample. The 3D arrangement of the cavities suggests a strongly varying shear-plane topography. These findings highlight the structural complexity of a supposedly nm-thin shear defect in a metallic glass.
||Planned: Supplemental Proceedings volume