About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Defects and Interfaces: Modeling and Experiments
|
Presentation Title |
Work Hardening in Colloidal Crystals |
Author(s) |
Seongsoo Kim, Ilya Svetlizky, David A. Weitz, Frans A. Spaepen |
On-Site Speaker (Planned) |
Seongsoo Kim |
Abstract Scope |
By deforming a colloidal face-centered cubic single crystal in shear and tracking its micron-size constitutive particles by confocal microscopy, it is possible make stress-strain measurements, as well as observe the development of the dislocation structure in full detail. We observe that the crystal strongly work hardens, and that the controlling mechanism is the formation of junctions by the cutting of forest dislocations. We find that the relation between the flow stress and the dislocation density closely agrees with the Taylor law as observed in atomic crystals. There is an initial transient phase, during which hardening is mediated by the nucleation of dislocations. The flow stress saturates when localization occurs and slip occurs on unconventional slip systems. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Modeling and Simulation, Shaping and Forming |