| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Long Range Internal Stress Assessment Using Convergent Beam Electron Diffraction and Dislocation Dipole Height in Cyclically Deformed Copper Single Crystals |
| Author(s) |
Roya Ermagan, Maxime Sauzay , Michael Ernest Kassner |
| On-Site Speaker (Planned) |
Roya Ermagan |
| Abstract Scope |
Understanding Long Range Internal Stresses (LRIS) is critical for explaining the basis of the Bauschinger effect, spring-back in metal forming, and plastic deformation in cyclically deformed metals. Few studies have assessed LRIS in cyclically deformed single crystals in single-slip while there are no such studies in multiple-slip. Here, we report on LRIS in a cyclically deformed copper single crystal in multiple-slip via two methods: 1- Lattice parameter determination using Convergent Beam Electron Diffraction (CBED) and 2- Measuring the maximum dipole heights. TEM micrographs show a labyrinth dislocation microstructure with high dislocation density walls and low dislocation density channels. Lattice parameters and dipole heights were assessed in the channels and walls of the labyrinth structure. Lattice parameters obtained were almost identical near the walls and in the channels. The maximum dipole heights were also approximately independent of location. Thus, a homogenous stress state within the heterogeneous dislocation structure is suggested. |
| Proceedings Inclusion? |
Planned: |