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Dislocation-Assisted Grain Growth in Nanocrystalline Copper under Large Deformation

机译:大变形下纳米晶铜的脱位辅助晶粒生长

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Dislocation plasticity would conventionally induce textures in polycrystalline metals after a large deformation. We used parallel molecular dynamics (MD) to simulate the plastic deformation of nanocrystalline copper to an isochoric stretch up to 100 percent logarithmic strain. We found that the movements of partial dislocations that dominate the deformation process do not lead to texture formation. The grain size distribution becomes extremely in-homogeneous. By observing the structural evolution, we demonstrate that partial dislocations assisted the grain growth that destroys the texture.
机译:在大变形后,脱位可塑性通常会诱导多晶金属中的纹理。我们使用了平行分子动力学(MD)来模拟纳米晶体铜的塑性变形,到等级伸展率高达100%对数应变。我们发现,主导变形过程的部分脱位的动作不会导致纹理形成。粒度分布变得极其均匀。通过观察结构演变,我们证明部分脱位辅助破坏质地的晶粒生长。

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