|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale IV
||Atomistic Modeling of the Mechanical Properties of Nanoglass-metallic Glass Nanolaminates
||Paulo Branicio, Z. D. Sha
|On-Site Speaker (Planned)
We applied tensile loading molecular-dynamics simulations to investigate the mechanical properties of composite nanolaminates combining alternating layers of CuZr metallic glass (MG) and 5-nm grain sized nanoglass (NG). Results indicate failure by shear banding when NG layers are separated by more than 50 nm. Nanolaminate strength vs. MG fraction follows an inverse Hall-Petch relationship. In contrast, nanolaminates exhibit enhanced tensile ductility regardless of the loading direction when NG layers are closely packed. Decreasing the distance between NG layers to 4.8~6.5 nm induces a transition from shear banding to nearly superplastic flow for loading applied either perpendicular or parallel to interfaces. The results suggest that MG-NG nanolaminates with NG layers closely packed and interfaces parallel to loading direction are able to preserve the enhanced ductility while producing a strength of 2.35 GPa, 15% larger than that of pure NG. These results are expected to motivate the development of enhanced MG composites.
||Planned: Supplemental Proceedings volume