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Mesoscale modeling of dislocation density gradients and microstructure evolution

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Author

Summary, in English

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.

Department/s

Publishing year

2012

Language

English

Pages

211-214

Document type

Conference paper

Topic

  • Mechanical Engineering

Conference name

25th Nordic Seminar on Computational Mechanics, 2012

Conference date

2012-10-25 - 2012-10-26

Conference place

Lund, Sweden

Status

Published