| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Bulk Metallic Glasses XVII
|
| Presentation Title |
Correlating Structural Heterogeneity to Properties of Metallic Glasses using Mesoscale Deformation Simulation Incorporating 4D-STEM |
| Author(s) |
Pengyang Zhao, Soohyun Im, Geun Hee Yoo, Eun Soo Park, Jinwoo Hwang, Yunzhi Wang |
| On-Site Speaker (Planned) |
Jinwoo Hwang |
| Abstract Scope |
We present the new correlation between the mechanical properties and the nanoscale structural heterogeneity that is attributed to the distribution of medium range ordering (MRO) in metallic glasses (MGs). Our novel approach uses mesoscale deformation simulation based on the heterogeneously randomized shear transformation zone (STZ) model, which incorporates the type, size, distribution, and volume fraction of MRO precisely determined using 4-dimensional scanning transmission electron microscopy (4D-STEM). We show that the details of MRO and structural heterogeneity vary significantly with small changes in composition and thermal history, which results in substantial change in measured ductility. The mesoscale simulation provides important insights on how the nanoscale structure in MGs determines the STZ activation and formation of shear bands. The result provides important guidance on how to tune the nanoscale structure to control the ductility of MGs, which can lead to new MGs achieving both high strength and ductility. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |