Dislocation interactions at reduced strain rates in atomistic simulations of nanocrystalline Al
Maxime Dupraz, Zhen Sun, C Brandl, Helena Van Swygenhoven
ACTA MATERIALIA | PERGAMON-ELSEVIER SCIENCE LTD | Published : 2018
Molecular dynamics simulations of transient stress drops have been carried out in different regimes on a nanocrystalline Aluminum sample with average grain size of 12 nm. Besides confirming the interpretation of experimental results obtained during in situ X-ray diffraction, the creep simulations performed at 2 or 3 orders of magnitude lower strain rates than usual reveal deformation mechanisms that have not been observed previously. First of all, it is evidenced that the misfit dislocations available at the GB assist the propagation of a lattice dislocation on a plane with low resolved shear stress. Furthermore, it is shown that the interaction of two dislocations gliding on parallel slip p..View full abstract
Awarded by European Research Council within the advanced grant advanced grant MULTIAX
Awarded by Swiss National Science Foundation
HVS and MD gratefully thank the European Research Council for the financial support within the advanced grant advanced grant MULTIAX (339245). ZS gratefully acknowledge the support of the Swiss National Science Foundation for financial support (200021_137881). The MD simulation was performed on the computational resource ForHLR I funded by the Ministry of Science, Research and the Arts Baden-Wurttemberg and DFG ("Deutsche Forschungsgemeinschaft").