Mesoscale modeling of dislocation density gradients and microstructure evolution

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Sammanfattning

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.
Originalspråkengelska
Sidor211-214
StatusPublished - 2012
Evenemang25th Nordic Seminar on Computational Mechanics, 2012 - Lund, Lund, Sverige
Varaktighet: 2012 okt. 252012 okt. 26
Konferensnummer: 25

Konferens

Konferens25th Nordic Seminar on Computational Mechanics, 2012
Förkortad titelNSCM
Land/TerritoriumSverige
OrtLund
Period2012/10/252012/10/26

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