| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Chemistry and Physics of Interfaces
|
| Presentation Title |
Everything is not Affine: How Non-Affine Transformations Enable a New State of Crystalline Interfacial Coherency |
| Author(s) |
Ryan Sills, Alejandro Hinojos, Trevor Murray, Xiaowang Zhou, Douglas Medlin |
| On-Site Speaker (Planned) |
Ryan Sills |
| Abstract Scope |
In the theory of coherent interfaces, coherency is established between two crystals by applying affine transformations comprised of rotations, stretches/compressions, and translations to each crystal. Once a coherent reference state for the interface is so-defined, a subset of lattice sites for each crystal are rendered coherent. We show in this talk that by also allowing for non-affine transformations to be applied to the crystals, additional coherent atomic sites can be obtained; we call such interfaces discoherent. The operation of applying these non-affine transformations is topologically equivalent to inserting disconnection (or disclination) dipoles or loops into the interface. We argue that these defects represent a new class of interfacial line defects which we call discohesions. Through molecular dynamics simulations and atomic resolution microscopy we reveal the presence of discoherency in phase, grain, and twin boundaries, and reveal the influence of discoherency on interfacial behaviors. |
| Proceedings Inclusion? |
Planned: |