| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Grain Boundaries and Interfaces: Metastability, Disorder, and Non-Equilibrium Behavior
|
| Presentation Title |
Corrosion-induced Grain Boundary Migration |
| Author(s) |
Yang Yang, Weiyue Zhou, Sheng Yin, Qin Yu, Daniel Schreiber, Jim Ciston, Mark Asta, Michael Short, Andrew Minor |
| On-Site Speaker (Planned) |
Yang Yang |
| Abstract Scope |
Engineering the grain boundaries (GBs) in materials can offer superior performance such as high strength and high ductility. However, GBs are dynamic and can be changed by external stimuli such as heating, mechanical deformation, or radiation damage. Recently, it has been shown that corrosion can also lead to the migration of GBs, and the resultant microstructural heterogeneity may impact the damage tolerance significantly. Here we show direct experimental evidence of GB migration in Ni-20Cr after corrosion in molten salt. Furthermore, the GB migration also led to the formation of a de-alloyed zone which was enriched in Ni and depleted in Cr. Combining advanced electron microscopy characterization and DFT modeling, we probed the excess vacancy concentration in the de-alloyed zone and identified it as the precursors of pores. Our results provide important insight into the GB stability under extreme conditions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Environmental Effects, Phase Transformations |