Mesoscale modeling of dislocation density gradients and microstructure evolution
(2012) 25th Nordic Seminar on Computational Mechanics, 2012 p.211-214- Abstract
- The presence of grain boundaries in the microstructure of metallic materials causes heterogeneous distributions of dislocation density. In the present contribution, the evolution of dislocation density is viewed as a reaction-diffusion system, involving mobile and immobile dislocations. Gradient effects are introduced by making the immobilization of dislocations sensitive to presence of grain boundaries. The model provides a macroscopic yield stress behavior of Hall-Petch type, without explicitly incorporating a yield stress dependence on the grains size. In addition, the model is employed in a cellular automaton algorithm, allowing a polycrystalline microstructure to evolve due to dynamic recrystallization, confirming that the introduced... (More)
- The presence of grain boundaries in the microstructure of metallic materials causes heterogeneous distributions of dislocation density. In the present contribution, the evolution of dislocation density is viewed as a reaction-diffusion system, involving mobile and immobile dislocations. Gradient effects are introduced by making the immobilization of dislocations sensitive to presence of grain boundaries. The model provides a macroscopic yield stress behavior of Hall-Petch type, without explicitly incorporating a yield stress dependence on the grains size. In addition, the model is employed in a cellular automaton algorithm, allowing a polycrystalline microstructure to evolve due to dynamic recrystallization, confirming that the introduced gradients provide important additions to recrystallization modeling. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3158272
- author
- Hallberg, Håkan LU and Ristinmaa, Matti LU
- organization
- publishing date
- 2012
- type
- Contribution to conference
- publication status
- published
- subject
- pages
- 211 - 214
- conference name
- 25th Nordic Seminar on Computational Mechanics, 2012
- conference location
- Lund, Sweden
- conference dates
- 2012-10-25 - 2012-10-26
- language
- English
- LU publication?
- yes
- id
- af3fde71-2d7c-420d-aba3-97d0c8f69a65 (old id 3158272)
- date added to LUP
- 2016-04-04 13:44:28
- date last changed
- 2018-11-21 21:15:58
@misc{af3fde71-2d7c-420d-aba3-97d0c8f69a65, abstract = {{The presence of grain boundaries in the microstructure of metallic materials causes heterogeneous distributions of dislocation density. In the present contribution, the evolution of dislocation density is viewed as a reaction-diffusion system, involving mobile and immobile dislocations. Gradient effects are introduced by making the immobilization of dislocations sensitive to presence of grain boundaries. The model provides a macroscopic yield stress behavior of Hall-Petch type, without explicitly incorporating a yield stress dependence on the grains size. In addition, the model is employed in a cellular automaton algorithm, allowing a polycrystalline microstructure to evolve due to dynamic recrystallization, confirming that the introduced gradients provide important additions to recrystallization modeling.}}, author = {{Hallberg, Håkan and Ristinmaa, Matti}}, language = {{eng}}, pages = {{211--214}}, title = {{Mesoscale modeling of dislocation density gradients and microstructure evolution}}, year = {{2012}}, }