Skip to Main content Skip to Navigation
Journal articles

Effects of the grain size and shape on the flow stress: A dislocation dynamics study

Abstract : Dislocation dynamics simulation is used to investigate the effect of grain size and grain shape on the flow stress in model copper grains. We consider grains of 1.25-10 µm size, three orientations (<135>, <100> and <111>) and three shapes (cube, plate and needles). Two types of periodic aggregates with one or four grains are simulated to investigate different dislocation flux at grain boundaries. It is shown that in all cases the flow stress varies linearly with the inverse of the square root of the grain size, with a proportionality factor varying strongly with the grain orientation and shape. Simulation results are discussed in the light of other simulation results and experimental observations. Finally, a simple model is proposed to account for the grain shape influence on the grain size effect.
Complete list of metadata

Cited literature [65 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-01931425
Contributor : Benoit Devincre Connect in order to contact the contributor
Submitted on : Monday, March 4, 2019 - 12:32:49 PM
Last modification on : Saturday, May 8, 2021 - 3:41:05 AM
Long-term archiving on: : Wednesday, June 5, 2019 - 2:15:43 PM

File

HP_Jiang.pdf
Files produced by the author(s)

Identifiers

Collections

CNRS | EDF | ONERA

Citation

Maoyuan Jiang, Benoit Devincre, Ghiath Monnet. Effects of the grain size and shape on the flow stress: A dislocation dynamics study. International Journal of Plasticity, Elsevier, 2019, 113, pp.111-124. ⟨10.1016/j.ijplas.2018.09.008⟩. ⟨hal-01931425⟩

Share

Metrics

Record views

159

Files downloads

1561