About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials Kinetics and Mechanisms Under External Forcing-Driven Conditions
|
| Presentation Title |
Abnormal Grain Growth under Cyclic Loading |
| Author(s) |
Yazhuo Liu, Yichen Yang, Xing Liu, Kunqing Ding, Yin Zhang, Olivier Pierron, Ting Zhu |
| On-Site Speaker (Planned) |
Yazhuo Liu |
| Abstract Scope |
Ultrafine-grained metals exhibit exceptional strength but suffer from microstructural instability under mechanical loading. Our experiments demonstrate that abnormal grain growth can occur in ultrafine-grained metals under high-cycle fatigue at room temperature, even without macroscopic plasticity. This phenomenon is predominantly observed in specific grain families. In a <100>-textured Ni thin film, grains with <100> orientation along loading direction show preferential growth, whereas in a <111>-textured Au sample, grains with <110> or <112> orientations near the loading direction dominate the coarsening behavior. Combining micromechanics analysis with phase-field simulation, we reveal that elastic anisotropy dictates the driving force for abnormal grain growth. Specifically, grains with the lowest elastic stiffness along loading direction experience the highest driving force for grain growth. Therefore, these grains grow at the expense of their neighbors. This work provides crucial insights into identifying the most detrimental microstructural features, and strategies for tailoring grain structures through controlled external loading conditions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Mechanical Properties, Other |