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首页> 外文期刊>Scripta materialia >Plastic deformation mechanism in nanotwinned metals: An insight from molecular dynamics and mechanistic modeling
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Plastic deformation mechanism in nanotwinned metals: An insight from molecular dynamics and mechanistic modeling

机译：纳米孪生金属中的塑性变形机制：从分子动力学和力学建模中获得的见解

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摘要

An overview is given of the deformation mechanisms in nanotwinned copper, as studied by recent molecular dynamics, dislocation mechanics and crystal plasticity modeling. We highlight the unique role of nanoscale twin lamellae in producing the hard and soft modes of dislocation glide, as well as how the coherent twin boundaries affect slip transfer, dislocation nucleation, twinning and detwinning. These twin boundary-mediated deformation mechanisms have been mechanistically linked to the mechanical properties of strength, ductility, strain hardening, activation volume, rate sensitivity, size-dependent strengthening and softening in nanotwinned metals. Finally, discussions are dedicated to identifying important unresolved issues for future research.
机译：通过最近的分子动力学，位错力学和晶体可塑性模型研究，概述了纳米孪晶铜的变形机理。我们强调了纳米级孪晶层在产生位错滑动的硬模式和软模式中的独特作用，以及相干的孪晶边界如何影响滑移转移，位错成核，孪晶和解缠。这些孪生边界介导的变形机制已与纳米孪晶金属的强度，延展性，应变硬化，活化体积，速率敏感性，尺寸依赖性增强和软化的机械性能机械关联。最后，讨论致力于确定重要的未解决问题，以供将来研究。

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