About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
2026 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-48: Grain Interface Functional Design to Create Damage Resistance in Polycrystalline Tantalum |
| Author(s) |
Olajesu Favor Olanrewaju, Kevin Jacob, Curt Bronkhorst, Nan Chen, Marko Knezevic, Sid Pathak |
| On-Site Speaker (Planned) |
Olajesu Favor Olanrewaju |
| Abstract Scope |
Our NSF-DMREF project investigates the evolution of void nucleation at grain boundary regions to improve predictions of ductile failure in polycrystalline materials. Using spherical nanoindentation stress–strain techniques, we characterize the local mechanical behavior of individual grains and grain boundary regions in polycrystalline tantalum, our model BCC refractory metal. Our analysis examines the effects of grain misorientation, elastic–plastic response, and Taylor factor mismatch on the local mechanical properties. By correlating local indentation yield strengths with increased slip resistance and stored energy variations arising from Taylor factor mismatch, we reveal how these factors evolve under progressive cold work through interrupted tensile experiments. We find that hardened boundary layers expand with increasing Taylor factor mismatch, promoting grain fragmentation and suppressing intragranular plasticity, which in turn heightens the propensity for void nucleation. This systematic approach underscores the critical role of distinct grain boundaries in governing deformation mechanisms within multi-phase polycrystalline systems. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
High-Temperature Materials, Mechanical Properties, Characterization |