|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XV
||Strain Delocalization and Fracture Behaviors of Laminated Metallic Glass Composites
||Xinghang Zhang, Zhe Fan, Jian Wang, Jin Li, Haiyan Wang
|On-Site Speaker (Planned)
A majority of 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 appropriate dimensions, shear delocalization for metallic glasses can be achieved as a manifestation of ductile dimples in amorphous phase. Dimple sizes can be tailored by varying the dimension of amorphous phase. Unlike instantaneous crack propagations for most metallic glasses, cracks in amorphous phase in certain nanolaminates can travel in a highly periodic saw-tooth fashion. Continuous reduction of the layer thickness of amorphous phase leads to evolution of fracture morphology from ductile dimples to columnar type of brittle fracture surfaces. In situ micropillar compression studies show that layer interface can promote work hardening and shear delocalization in metallic glass composites.
||Planned: Supplemental Proceedings volume