About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Chemistry and Physics of Interfaces
|
| Presentation Title |
Exploring the impact of atomic-scale grain boundary phase transformations on macroscopic transport properties |
| Author(s) |
Christian Liebscher, Hui Ding, Esakkiraja Neelamegan, Anoosheh Akbari, Harald Rösner, Gerhard Wilde, Sergiy Divinski |
| On-Site Speaker (Planned) |
Christian Liebscher |
| Abstract Scope |
Phase transformations at grain boundaries have attracted significant interest in both, experiments and simulations. However, how such transforming interfaces impact the behaviour of bulk materials remains unexplored. Here, we first summarize our atomic-scale observations of grain boundary phase transformations in elemental copper and copper-silver alloys. We then explore the relation of the macroscopic appearance of grain boundaries in model copper bicrystal geometries to the emerging local atomic scale structural variations by length-scale bridging electron microscopy. The macroscopically flat grain boundary shows various types of defects at the atomic level that form in dependence of the deviation in grain misorientation and/or habit plane. Measurements of cobalt diffusion reveal characteristic penetration profiles, indicating that the grain boundary undergoes a segregation-induced phase transition. Atomic resolution microscopy is used to explore the state of the grain boundary in dependence of the local cobalt concentration to establish its impact on the macroscopic transport properties. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Copper / Nickel / Cobalt, Other |