About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Local Chemical Ordering and Its Impact on Mechanical Behaviors, Radiation Damage, and Corrosion
|
| Presentation Title |
Atomic Level Observation of Grain Boundary Phases With Icosahedral Order |
| Author(s) |
Christian Liebscher |
| On-Site Speaker (Planned) |
Christian Liebscher |
| Abstract Scope |
Solute segregation to grain boundaries in metallic alloys can have a tremendous effect on material properties. The arrangement of solute atoms within such interfaces and the emergence of novel states induced by solute segregation is rarely explored. In this talk, I will show how iron segregation to grain boundaries in titanium induces novel interface phases with icosahedral order. I will focus on exploring the atomic grain boundary structures by scanning transmission electron microscopy. Atomic resolution imaging reveals the formation of distinct icosahedral units at symmetric and asymmetric grain boundary segments. The local atomic ordering within the icosahedra is explored in combination with advanced grain boundary structure prediction. It is found that the vertices of the icosahedra are predominantly occupied by titanium atoms, while iron is found at its center. These structures differ from building blocks observed in related bulk phases and I will discuss implications for interface design strategies. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Titanium, Characterization, Thin Films and Interfaces |