Dislocation Avalanches, Strain Bursts, and the Problem of Plastic Forming at the Micrometer Scale
Karlsruhe Institute of Technology · Eötvös Loránd University · +3 more institutions
Abstract
Under stress, many crystalline materials exhibit irreversible plastic deformation caused by the motion of lattice dislocations. In plastically deformed microcrystals, internal dislocation avalanches lead to jumps in the stress-strain curves (strain bursts), whereas in macroscopic samples plasticity appears as a smooth process. By combining three-dimensional simulations of the dynamics of interacting dislocations with statistical analysis of the corresponding deformation behavior, we determined the distribution of strain changes during dislocation avalanches and established its dependence on microcrystal size. Our results suggest that for sample dimensions on the micrometer and submicrometer scale, large strain…
Citation impact
- FWCI
- 14.16
- Percentile
- 100%
- References
- 22
Authors
5- FCF. Csikor
Karlsruhe Institute of Technology, Eötvös Loránd University, Institute for Scientific Interchange, Istituto Nazionale per la Fisica della Materia, University of Edinburgh
- CMChristian Motz
Karlsruhe Institute of Technology, Eötvös Loránd University, Institute for Scientific Interchange, Istituto Nazionale per la Fisica della Materia, University of Edinburgh
- DWD. Weygand
Karlsruhe Institute of Technology, Eötvös Loránd University, Institute for Scientific Interchange, Istituto Nazionale per la Fisica della Materia, University of Edinburgh
- MZMichael Zaiser
Karlsruhe Institute of Technology, Eötvös Loránd University, Institute for Scientific Interchange, Istituto Nazionale per la Fisica della Materia, University of Edinburgh
- SZStefano ZapperiCorresponding
Karlsruhe Institute of Technology, Eötvös Loránd University, Institute for Scientific Interchange, Istituto Nazionale per la Fisica della Materia, University of Edinburgh
Topics & keywords
- Materials science
- Plasticity
- Dislocation
- Micrometer
- Deformation (meteorology)
- Dislocation creep
- Lattice (music)
- Stress (linguistics)