|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XV
||The Mechanism of Free-volume Concentration by Controlling Shear Bands in Bulk Metallic Glasses
||Zhong Wang, Shuying Chen, Jiaojiao Li, Junwei Qiao, Peter K. Liaw
|On-Site Speaker (Planned)
Bulk metallic glasses (BMGs) deform irreversibly under stress through shear-banding courses, which is manifested as the serrated flow behavior. Numerous compressive experiments have been carried out at the strain rates of 2 × 10<SUP>-4</SUP> and 2 × 10<SUP>-5</SUP> s<SUP>-1</SUP> to ensure the stability of the fracture strain for Zr-based BMGs. The change of strain rates in compression tests were investigated between these two strain rates until failure. The different serrated flow behavior was exhibited due to the different loading model, which is attributed to the free volume concentration. Due to the jerky flow corresponding to the internal shear banding event, the free volume model was introduced to explain the evolution of shear bands. The mechanism was studied by relating the atomic-scale deformation with shear banding events, offering new insights to understand the serration events in BMGs.
||Planned: Supplemental Proceedings volume