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Mechanics and Dislocation Structures at the Micro-Scale: Insights on Dislocation Multiplication Mechanisms from Discrete Dislocation Dynamics Simulations

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Abstract

The plasticity of micro-pillar deformation has widely been studied by discrete dislocation dynamics simulations to explain the so-called size effect. In this study the role of glissile junctions forming during plastic deformation under various loading scenarios is in the center of interest. The activity of these naturally forming dislocation sources is followed in detail. Surprisingly these junctions are rather active sources and not just another obstacle as often assumed. Their relative contribution to the overall dislocation density for the simulated specimens reaches often values of 20% or even more. The formation of such a glissile junction is often correlated to stress drops or the end of a stress drop. It is therefore suggested – at least for the sample sizes considered – that this dislocation multiplication mechanism should be take into account in continuum models such as crystal plasticity of higher order dislocation continuum theories.

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References

  1. M.D. Uchic et al. Sample Dimensions Influence Strength and Crystal Plasticity. Science, Vol. 305 (2004) 986.

    Article  Google Scholar 

  2. D. Weygand, Size Effect in the Plastic response of sub-micrometer sized pillars: A three-dimensional discrete dislocation dynamics study, Proceedings of 3rd International Conference on Multiscale materials Modeling (2006) 244.

  3. A. Parthasarathy, S.I. Rao, D.M. Dimiduk, M.D.Uchic, D.R. Trinkle, Contributions to size effect of yield strength from the stochastics of dislocations source length in finite samples, Scripta Mater. 57 (2007) 313.

    Article  Google Scholar 

  4. J. Senger, D. Weygand , P. Gumbsch, O. Kraft, Discrete dislocation simulations of the plasticity of micro-pillars under uniaxial loading, Scripta Materialia 58 (2008) 587.

    Article  CAS  Google Scholar 

  5. M.D. Uchic et al. Plasticity of Micrometer-Scale Single Crystals in Compression. Annual Review of Materials Research, Vol. 39 (2009) 361.

    Article  CAS  Google Scholar 

  6. O. Kraft, P. Gruber, R. Mönig, D. Weygand, Plasticity in Confined Dimensions. Annual Review of Materials Research, Vol. 40 (2010) 293.

    Article  CAS  Google Scholar 

  7. D. Weygand, M. Poignant, P. Gumbsch, O. Kraft, Three-dimensional dislocation dynamics simulation of the influence of sample size on the stress-strain behavior of fcc single-crystalline pillars, Mat. Sci. Eng A 483-484 (2008) 188.

  8. C. Motz, D. Weygand, J. Senger, P. Gumbsch, Initial dislocation structures in 3-D discrete dislocation dynamics and their influence on microscale plasticity, Acta Materialia 57 (2009) 1744.

    Article  CAS  Google Scholar 

  9. J. Senger, D. Weygand, C. Motz, P. Gumbsch, O. Kraft, Aspect ratio and stochastic effects in the plasticity of uniformly loaded micrometer sized specimens, Acta. Materialia 59 (2011) 2937.

    Article  CAS  Google Scholar 

  10. J. Senger, D. Weygand, O. Kraft, P. Gumbsch, Dislocation microstructure evolution in cyclically twisted micro samples: a Discrete Dislocation Dynamics simulation, Mod. Sim. Mat. Sci. Eng. (2011) 074004.

  11. D. Weygand, L.H. Friedman, E. Van der Giessen, A. Needleman, Aspects of boundary-value problem solutions with three-dimensional dislocation dynamics, Mod. Sim. Mat. Sci. Eng. 10 (2002) 437.

    Article  Google Scholar 

  12. D. Weygand, J. Senger, C. Motz, W. Augustin, V. Heuveline, P. Gumbsch, High Performance Computing and Discrete Dislocation Dynamics: Plasticity of Micrometer Sized Specimens, High Performance Computing In Science And Engineering ‘08 ed: Nagel WE; Kroner DB; Resch MM, Springer (2009) 507.

  13. D. Weygand, P. Gumbsch, Study of dislocation reactions and rearrangements under different loading conditions, Mat. Sci. Eng. A 400-401 (2005) 158.

  14. G. Saada, P. Veyssiere, Work hardening of Face Centred Cubic Crystals. Dislocation Intersection and Cross Slip, Dislocations in Solids, Chap 61, ed. Nabarro and Duesbery, Elsevier, (2002) 413.

  15. R. Madec, B. Devincre, L. Kubin, T. Hoc, D. Rodney, The Role of Collinear Interaction in Dislocation-Induced Hardening, Science 2003, 1879.

  16. B. Devincre, L. Kubin, T. Hoc, Physical analysis of crystal plasticity by DD simulations, Scripta Materialia 54 (2006) 741.

    Article  CAS  Google Scholar 

  17. F.F. Csikor, C. Motz, D. Weygand, M. Zaiser, S. Zapperi, Dislocation Avalanches, Strain Bursts, and the Problem of Plastic Forming at the Micrometer Scale, Science 318 (2007) 251.

    Article  CAS  Google Scholar 

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  1. Institute for Applied Materials, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany

    D. Weygand

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Weygand, D. Mechanics and Dislocation Structures at the Micro-Scale: Insights on Dislocation Multiplication Mechanisms from Discrete Dislocation Dynamics Simulations. MRS Online Proceedings Library 1651, 702 (2014). https://doi.org/10.1557/opl.2014.362

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