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Tensile deformation mechanisms of the hierarchical structure consisting of both twin-free grains and nanotwinned grains

机译：由双自由晶粒和纳米孪晶晶粒组成的分层结构的拉伸变形机制

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A series of large-scale molecular dynamics simulations have been performed to investigate the tensile properties and atomistic deformation mechanisms for the nanostructured Cu with three typical microstructures: the hierarchical structure consisting of both twin-free grains (d=70nm) and grains with bundles of smaller nanotwins (d=70nm, λ= 10nm), the fully nanograined structure and the fully nanotwinned structure. The average flow stress of the hierarchically structure is found to be higher than that calculated by rule of mixture. As compared with that of fully nanograined structure, the strength for the twin-free grains in the hierarchical structure is promoted and gives extra hardening due to the increased dislocation density and dislocation behaviours. It is also found that the nanotwin bundles are more deformable than the twin-free grains in the hierarchical structure according to the deviatoric strain invariant contour. This indicates that the fully nanograined structure cannot only be strengthened to a higher level, but also obtain better ductility by embedded with stronger bundles of smaller nanotwins. Thus, a superior strength-ductility synergy could be obtained in this kind of hierarchical structures, and this novel strategy has also been implemented in bulk austenitic steels or copper by recent experiments.
机译：已经进行了一系列大规模的分子动力学模拟，以研究具有三种典型微观结构的纳米结构Cu的拉伸性能和原子形变机理：由双自由晶粒（d = 70nm）和具有束状晶粒的晶粒组成的分层结构较小的纳米孪晶（d = 70nm，λ= 10nm），完全纳米粒度的结构和完全纳米孪生的结构。发现分层结构的平均流应力高于通过混合法则计算的平均流应力。与完全纳米晶结构相比，由于位错密度和位错行为的增加，无双晶晶粒的强度得到了增强，并且具有额外的硬化作用。还发现，根据偏应变不变轮廓，纳米孪晶束在分层结构中比无孪晶晶粒更易变形。这表明完全纳米化的结构不仅可以增强到更高的水平，而且可以通过嵌入更小的纳米孪晶的更强束来获得更好的延展性。因此，在这种分层结构中可以获得优异的强度-延性协同作用，并且通过最近的实验，这种新颖的策略也已经在大块奥氏体钢或铜中实现。

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