About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Bulk Metallic Glasses XVII
|
Presentation Title |
Shear Band Nucleation Kinetics in Metallic Glasses |
Author(s) |
Meng Gao, John H. Perepezko, Junqiang Wang |
On-Site Speaker (Planned) |
Meng Gao |
Abstract Scope |
The development of shear bands is recognized as the primary mechanism in controlling the plastic deformability of metallic glasses. However, the kinetics of the nucleation of shear bands has received limited attention. The nucleation of shear bands in metallic glasses (MG) can be investigated using a nanoindentation method to monitor the development of the first pop-in event that is a signature of shear band nucleation. The analysis of a statistically significant number of first pop-in events demonstrates the stochastic behavior that is characteristic of nucleation and reveals a multimodal behavior associated with local spatial heterogeneities. The shear band nucleation rate of the two nucleation modes and the associated activation energy, activation volume, and site density were determined by loading rate experiments and related the β relaxation. The identification of the rate controlling kinetics for shear band nucleation offers guidance for promoting plastic flow in metallic glass. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |