| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Bulk Metallic Glasses XVII
|
| Presentation Title |
J-13: Shear Transformation Zone Properties from Nonlinear Anelastic Deformation |
| Author(s) |
Tianjiao Lei, Michael Atzmon |
| On-Site Speaker (Planned) |
Tianjiao Lei |
| Abstract Scope |
Anelastic deformation of metallic glasses (MGs) is an ideal regime to study properties of shear transformation zones (STZs), which are atomic clusters responsible for shear transformation, since they are isolated and do not interact with each other. At high stress, when the viscosity is non-Newtonian, the details of the activation volume can be obtained, which are unavailable in the linear regime. We have developed a constraining method with bending strain up to ~ 1.55% for Al86.8Ni3.7Y9.5 MG. The anelastic strain is highly nonlinear in the stress, which is mainly due to the non-equilibrated largest and slowest active STZs at the end of constraining period. Using nonlinear kinetics under constraint and zero bending moment after constraint removal, the volume of the largest active STZs and the transformation shear strain are obtained independently for the inherent state: 4.8·10^-28 m^3 and 0.18, respectively. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |