About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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Presentation Title |
Formation and Evolution of Dislocation Cells During Plastic Deformation |
Author(s) |
Adam Cretton, Albert Zelenika, Felix Frankus, Sina Borgi, Can Yıldırım, Carsten Detlefs, Flemming Bjerg Grumsen, Grethe Winther, Henning Friis Poulsen |
On-Site Speaker (Planned) |
Adam Cretton |
Abstract Scope |
During plastic deformation, dislocations self-organise into cells, which subsequently continuously decrease in size. We present Diffraction X-ray Microscopy (DFXM) movies of the structural evolution during tensile
deformation of a mm-sized aluminium single crystal. The formation and subsequent development of 40,000 cells are visualised. The cells form in a stochastic, isotropic and uncorrelated manner already at 1% strain. We reveal that the cell size and dislocation density distributions are log-normal and bi-modal distributions, respectively, exhibiting scaling and maintaining a
fixed volume ratio between cell interior and cell boundary. This insight leads to an interpretation of the formation and evolution steps in terms of universal stochastic multiplicative processes. Tracking individual cells, cell boundaries and the dislocation density field as function of applied strain provides further insight in the mechanisms as play. We also discuss how the DFXM results can be interfaced to CDD and crystal plasticity modelling. |
Proceedings Inclusion? |
Planned: |
Keywords |
Aluminum, Mechanical Properties, Shaping and Forming |