Abstract
Dislocation dynamics simulations often reveal interesting phenomena in regard to material deformation, which may not be captured by experiments. In this work, we investigate the effect of dislocation dipoles on plastic material properties under different dipole configurations (i.e. the distance between active glide planes, and the signs of the two dislocations) using a 3D Discrete Dislocation Dynamics code. The simulations show that a dipole is causing a hardening effect when the Burgers vectors of the dislocations forming the dipole are of opposite sign and causing a hardening/softening effect when they are of the same sign. The distance between the two neighboring dislocations was also affecting the proportional limit for the material. Such hardening or flow stress results, as in this study, can be incorporated in larger-scale modeling work.
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Acknowledgements
This paper describes objective technical results and analysis. Any subjective views or opinions that might be expressed in the paper do not necessarily represent the views of the U.S. Department of Energy or the United States Government.
Sandia National Laboratories is a multi-mission laboratory managed and operated by National Technology and Engineering Solution of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.
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Siddique, A.B., Khraishi, T., Lim, H. (2021). Dislocation Dipole Study on Material Hardening/Softening. In: TMS 2021 150th Annual Meeting & Exhibition Supplemental Proceedings. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-65261-6_46
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DOI: https://doi.org/10.1007/978-3-030-65261-6_46
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