Abstract
A quantitative description of plastic deformation in crystalline solids requires a knowledge of how an assembly of dislocations — the defects responsible for crystal plasticity — evolves under stress1. In this context, molecular-dynamics simulations have been used to elucidate interatomic processes on microscopic (∼10−10 m) scales2, whereas ‘dislocation-dynamics’ simulations have explored the long-range elastic interactions between dislocations on mesoscopic (∼10−6 m) scales3. But a quantitative connection between interatomic processes and behaviour on mesoscopic scales has hitherto been lacking. Here we show how such a connection can be made using large-scale (100 million atoms) molecular-dynamics simulations to establish the local rules for mesoscopic simulations of interacting dislocations. In our molecular-dynamics simulations, we observe directly the formation and subsequent destruction of a junction (a Lomer–Cottrell lock) between two dislocations in the plastic zone near a crack tip: the formation of such junctions is an essential process in plastic deformation, as they act as an obstacle to dislocation motion. The force required to destroy this junction is then used to formulate the critical condition for junction destruction in a dislocation-dynamics simulation, the results of which compare well with previous deformation experiments4.
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Acknowledgements
This work originated at a collaborative workshop on materials modelling held at the Institute for Theoretical Physics, UCSB, during March 1997. F.F.A. acknowledges the use of the Cornell Theory Center, which receives funding from the NSF and New York State; B.D. and L.K. acknowledge the support of CNRS through the GdR programme on mesoscopic simulations and modelling in metallurgy; V.B. and S.Y. acknowledge support from LLNL; and V.B. acknowledges support from the Alcoa Foundation.
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Bulatov, V., Abraham, F., Kubin, L. et al. Connecting atomistic and mesoscale simulations of crystal plasticity. Nature 391, 669–672 (1998). https://doi.org/10.1038/35577
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DOI: https://doi.org/10.1038/35577
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