Unraveling the effects of continuous dislocation interactions with interfaces, particularly at the nanometer length scales, is key to a broader understanding of plasticity, to material design and to material certification. To this end, this work proposes a novel discrete dislocation dynamics-based model for dislocation interface interactions tracking the fate of residual dislocation on interfaces. This new approach is used to predict the impact of dislocation/interface reactions on the overall mechanical behavior of accumulative roll bonded nanometallic laminates. The framework considers the dynamic evolution of the interface concurrent with a large network of dislocations, thus, accounting for the local short and long range effects of the dislocations under the external boundary conditions. Specifically, this study focuses on two-phase Fe/Cu nanometallic laminates, and investigates the role of the underlying elastic and plastic contrast of the Fe and the Cu layers on the composite response of the material. Moreover, the role of initial microstructures, resulting from processing is also investigated. Subsequently, the model is used to examine the effect of layer thickness and interface orientation relationship on the residual stresses of the relaxed microstructure. The associated mechanical response of these laminates are compared when loaded under normal direction compression, as well as shear compression. Finally, this work predicts a dominant effect of the layer thickness, as compared to the interface orientation relationship, on the macroscopic response and on the residual stresses of these nanolaminates, while the local dislocation transmission propensity through the interface is significantly influenced by the corresponding orientation relationship.

中文翻译：

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通过位错动力学模拟研究界面对累积滚压纳米金属层压板机械响应的作用

揭示连续位错与界面相互作用的影响，特别是在纳米长度尺度上，是更广泛地理解可塑性、材料设计和材料认证的关键。为此，这项工作提出了一种新颖的基于离散位错动力学的位错界面相互作用模型，跟踪界面上残余位错的命运。这种新方法用于预测位错/界面反应对累积辊压粘合纳米金属层压板整体机械行为的影响。该框架考虑了与大型位错网络同时发生的界面的动态演化，从而解释了外部边界条件下位错的局部短程和长程效应。具体来说，本研究重点关注两相 Fe/Cu 纳米金属层压板，并研究 Fe 和 Cu 层的弹性和塑性对比对材料复合响应的作用。此外，还研究了加工产生的初始微观结构的作用。随后，该模型用于检查层厚度和界面取向关系对松弛微观结构的残余应力的影响。比较这些层压板在法向压缩和剪切压缩下加载时的相关机械响应。最后，这项工作预测了与界面取向关系相比，层厚度对这些纳米层压板的宏观响应和残余应力的主导影响，而通过界面的局部位错传输倾向受到相应取向的显着影响关系。