| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Hume-Rothery Symposium on Alloy Microstructure Science and Engineering
|
| Presentation Title |
Friction-mediated Subsurface Structural Transformations |
| Author(s) |
Peter Gumbsch, Christian Haug, Christian Greiner |
| On-Site Speaker (Planned) |
Peter Gumbsch |
| Abstract Scope |
Tribological contacts consume a significant amount of the world’s primary energy due to friction and wear. This energy is largely dissipated in the material underneath the two surfaces sliding against each other. This subsurface material is thereby exposed to extreme amounts of shear deformation exhibits twinning and often forms layered subsurface microstructures with reduced grain size. The elementary mechanisms for the evolution of subsurface microstructures are elucidated by systematic model experiments and corresponding simulations. The stress field under a moving spherical contact and the crystallographic orientation are crucial aspects for the initial breaking of symmetry and subsequent microstructural transformations. Electron backscatter diffraction (EBSD) performed directly on the bulk surface of the wear tracks reveals crystal lattice rotations by approximately up to 35 °, predominantly around the transverse direction (TD) in the surface. Under specific conditions, combined crystal rotation and twinning are observed. These results hold promise at guiding material selection and alloy development for tribological loading, yielding materials tailored for specific tribological scenarios. |
| Proceedings Inclusion? |
Planned: |