| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Defects and Interfaces: Modeling and Experiments
|
| Presentation Title |
Studying Grain Boundary Regions in Polycrystalline Tantalum Using Spherical Nano-indentation |
| Author(s) |
Olajesu Favor Olanrewaju, Manish Kumar, Jacob Kevin, Curt Bronkhorst, Marko Knezevic, Nan Chen, William Musinsky, Manny Gonzales, Sid Pathak |
| On-Site Speaker (Planned) |
Olajesu Favor Olanrewaju |
| Abstract Scope |
Our NSF-DMREF project seeks to fundamentally change how we approach the design and manufacture of materials by control of both defect/feature character and internal stress state to achieve a 30% reduction in accumulated damage. Our initial efforts describe the utility of spherical nanoindentation stress-strain curves in order to characterize the local mechanical behavior within individual grains of Ta (our model BCC refractory material) and near grain boundaries of polycrystalline Ta samples. Using a series of examples, we demonstrate the capabilities of our data analyses procedures in a) characterizing the local indentation yield strengths in individual grains of deformed polycrystalline metallic samples and relating them to increases in the local slip resistances, b) correlating the stored energy differences of individual grains to their Taylor factors as a function of imposed cold work, and c) understanding the role of interfaces such as grain boundaries in the deformation of a multi-phase polycrystalline sample. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, Characterization, Other |