| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Magnesium Technology 2025
|
| Presentation Title |
A Lie-algebra-based description of disclination densities and the quantification of partial disclinations in deformed polycrystalline metals |
| Author(s) |
Chunfeng Du, Yipeng Gao, Hui-Yuan Wang |
| On-Site Speaker (Planned) |
Chunfeng Du |
| Abstract Scope |
Crystalline defects play a critical role in determining the mechanical and functional properties of metallic materials. From a physical point of view, dislocations and disclinations are the two fundamental types of topological defects in crystals, which originate from the breaking of translational symmetry and rotational symmetry, respectively. In spite of extensive studies on dislocations in the literature, the effects of disclinations on mechanical properties of metals have not been well recognized. Here we suggest a Lie-algebra-based method to quantify the rotational properties of disclinations, which leads to a convenient way to determine disclination density distribution directly from Electron Backscatter Diffraction data. Three major formation mechanisms of disclinations have been identified in deformed polycrystalline Mg alloys, all of which can be treated as topological reactions among various types of defects. Our work suggests a new mathematical tool to investigate the interactions and reactions among multiple types of crystalline defects. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnesium, Mechanical Properties, Modeling and Simulation |