About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Deformation-induced Microstructural Evolution during Solid Phase Processing: Experimental and Computational Studies
|
Presentation Title |
Crystal Rotation Kinematics and the Activation of Different Twinning Systems due to Tribological Loading |
Author(s) |
Christian Greiner |
On-Site Speaker (Planned) |
Christian Greiner |
Abstract Scope |
Already in 1950, Bowden and Tabor pointed out that in metallic tribological contacts the majority of the dissipated energy is spend to change the contacting materials’ microstructures. This - in part - explains why most metals show a highly dynamic subsurface microstructure under the shear load imposed by a sliding contact. One key process involved therein is the reorientation of the crystal lattice. Model experiments performed with high-purity copper bicrystals shed light on the early stage, fundamental mechanisms of tribologically induced lattice rotation kinematics. Electron backscatter diffraction (EBSD) performed directly on the wear track reveals a crystal rotation process around the transverse direction, irrespective of sliding direction, grain orientation and normal load. By making use of CoCrFeMnNi single crystals, we could identify that depending on the friction coefficient, different deformation mechanisms like dislocated mediated plasticity and twinning are being activated. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Copper / Nickel / Cobalt, High-Entropy Alloys |