About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale VIII
|
| Presentation Title |
Atomistic Mechanism of Grain Boundary Network Evolution in Metallic Materials |
| Author(s) |
Jiangwei Wang, Yingbin Chen |
| On-Site Speaker (Planned) |
Jiangwei Wang |
| Abstract Scope |
Kinetics of grain boundary (GB) networks cirtically controls the structural stability and deformation of metallic materials upon thermomechanical stimuli. Triple junctions (TJs), as essential components connecting adjoining GBs, govern the coordinated evolution of entire GB network in polycrystalline materials. This presentation will discuss the atomistic mechanisms of TJ evolution under mechanical loading, using Au and Pt nanocrystals as example. Multiple modes of TJ kinetics occur through conservative/non-conservative disconnection activities across neighboring GBs, which at atomistic scale can be understood by the motion of disconnections across neighboring GBs. Conservative and non-conservative modes of TJs can transform with each other, contributing to the dynamic evolution of overall GB network. A unified framework of TJ kinetics is further established by considering the coupling between GB plasticity, intragranular plasticity, and TJ excess volume. These findings are applicable to general TJs with non-coaxial GBs in polycrystalline materials. |
| Proceedings Inclusion? |
Planned: |