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Discrete dislocation dynamics simulations of twin size-effects in magnesium

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Abstract

A dislocation-\(\left\{ {10\bar 12} \right\}\) twin boundary (TB) interaction model was proposed and introduced into discrete dislocation dynamics simulations to study the mechanical behavior of micro-twinned Mg. Strong strain hardening was captured by current simulations, which is associated with the strong TB’s barrier effect. In addition, twin size effects with small TB spacing leading to a strong yield stress, were observed to be orientation dependent. Basal slip orientation produces a strong size effect, while prismatic slip does a weak one.

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Acknowledgments

This research was sponsored by the Army Research Laboratory (#W911NF-12-2-0022). The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of ARL or U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein. HF also gratefully acknowledges the financial support of Natural Science Foundation of China (11302140).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA

    Haidong Fan & Jaafar A. El-Awady

  2. Department of Mechanics, Sichuan University, Chengdu, Sichuan, 610065, P. R. China

    Haidong Fan

  3. Condensed Matter and Materials Division, Lawrence Livermore National Laboratory, Livermore, CA, 94551-0808, USA

    Sylvie Aubry & A. Arsenlis

Authors
  1. Haidong Fan
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  2. Sylvie Aubry
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  3. A. Arsenlis
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  4. Jaafar A. El-Awady
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Correspondence to Haidong Fan.

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Fan, H., Aubry, S., Arsenlis, A. et al. Discrete dislocation dynamics simulations of twin size-effects in magnesium. MRS Online Proceedings Library 1741, 27–32 (2015). https://doi.org/10.1557/opl.2015.86

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  • DOI: https://doi.org/10.1557/opl.2015.86

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