About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Behavior at the Nanoscale VI
|
Presentation Title |
In Situ Nanomechanical Testing to Understand the Role of Grain Boundary Structure in Materials |
Author(s) |
Nan Li, Saryu Fensin, Abigail Hunter, Darby Luscher |
On-Site Speaker (Planned) |
Nan Li |
Abstract Scope |
Grain boundaries(GBs) are one of the most important planar defects in materials. Correlated mechanical response under loading leads to localized strain accumulation and structural changes in the vicinity of boundaries. This can determine whether dislocations can nucleate, transmit, or just be blocked at a boundary. In order to understand this process, we have performed in-situ pillar compression tests in a SEM coupled with electron backscatter diffraction(EBSD). During uniaxial compression, the indentation was paused at different strains to perform the EBSD scanning. Depending on the boundary structure, various interactions with dislocations at the boundary were captured. Correlated with the EBSD mapping at different strains, we could quantify lattice rotation and local strain tensor along the loading axis. Such information has helped us better understand the role of GB structure in determining its interactions with dislocations and provided a unique dataset for validation of modeling at both atomic and mesoscales. |
Proceedings Inclusion? |
Planned: |