| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
| Presentation Title |
Linking Atomic and Mesoscale Descriptions of Grain Boundaries for Insight into Metastable Structures |
| Author(s) |
James Nathaniel , Cassandra Pate, Larissa Woryk , Jaime Marian, Blas P. Uberuaga, David Srolovitz, Mitra L. Taheri |
| On-Site Speaker (Planned) |
Mitra L. Taheri |
| Abstract Scope |
Recent simulations that classify grain boundaries (GBs) according to microstates, or phases, present an opportunity to sharpen our understanding of radiation damage tolerance. GB stability may be defined as the ability of a GB to continue to absorb point defects without becoming saturated and without changing its macroscopic degrees of freedom (misorientation, inclination), or degrees of freedom. This talk shows that adding or removing atoms can change the GB microstate, and changes of GB microstate can alter the ability of GBs to influence radiation damage; we also explore radiation damage as a means of altering GB microstate. Through the use of in situ microscopy and quantitative dislocation density analysis coupled with both atomic and mesoscale simulations, a fundamental understanding of GB “states” evolve as a function of point defect absorption is presented. The results have profound implications in developing thermally stable, bulk nanocrystalline materials, and damage tolerant materials. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |