|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical Behavior of Nanostructured Materials
||Strain Delocalization and “Ductile” Fracture Behaviors of Metallic Glass
||Zhe Fan, Jin Li, Yingchao Yang, Qiang Li, Sichuang Xue, Haiyan Wang, Jun Lou, Jian Wang, Xinghang Zhang
|On-Site Speaker (Planned)
It is well adopted that most metallic glasses are brittle as deformation induces low density of shear bands and severe shear localization proceeding catastrophic failure. Here we show that by introduction of crystalline phase with the appropriate dimension, shear delocalization for metallic glasses can be achieved as a manifestation of ductile dimples in amorphous phase. Dimple sizes can be tailored by the dimension of amorphous phase. Besides, unlike instantaneous crack propagations for most metallic glasses, in this study, we demonstrate that cracks in amorphous phase can travel in a highly periodic fashion. While reducing the layer thickness of amorphous phase (same as the crystalline phase) down to certain length scale, the peak stress increases following a “Smaller is Stronger” trend. However under certain film thickness, inherent brittleness takes over, resulting in brittle fracture mode. We acknowledge the financial support by NSF-CMMI under grant No. 1161978.
||Planned: Supplemental Proceedings volume