About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Chemistry and Physics of Interfaces
|
| Presentation Title |
Grain boundary phases govern stress-induced hydride nucleation and fracture in titanium |
| Author(s) |
Vivek Devulapalli, Johann Michler, Xavier Maeder |
| On-Site Speaker (Planned) |
Vivek Devulapalli |
| Abstract Scope |
Grain boundaries in titanium actively govern phase transformation and failure mechanisms under stress. Building on the discovery that solute segregation induces topological GB phase transitions in Ti through icosahedral Fe-rich cage structures, the present work extends this interface-centric framework to stress-driven hydride nucleation. Using in situ TEM tensile testing of bicrystalline Ti specimens, we directly observe real-time nucleation and growth of cubic titanium hydride precipitates, with hydrogen introduced during FIB-based sample preparation. Precession electron diffraction mapping combined with HRTEM establishes that specific GB facets and facet junctions act as preferential nucleation sites, drawing a direct parallel to the site-selectivity observed in segregation-induced GB phase transitions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Titanium, Phase Transformations, Characterization |