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首页> 美国卫生研究院文献>Scientific Reports >Twin Boundaries merely as Intrinsically Kinematic Barriers for Screw Dislocation Motion in FCC Metals
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Twin Boundaries merely as Intrinsically Kinematic Barriers for Screw Dislocation Motion in FCC Metals

机译：双边界只是FCC金属中螺旋位错运动的固有运动学屏障

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摘要

Metals with nanoscale twins have shown ultrahigh strength and excellent ductility, attributed to the role of twin boundaries (TBs) as strong barriers for the motion of lattice dislocations. Though observed in both experiments and simulations, the barrier effect of TBs is rarely studied quantitatively. Here, with atomistic simulations and continuum based anisotropic bicrystal models, we find that the long-range interaction force between coherent TBs and screw dislocations is negligible. Further simulations of the pileup behavior of screw dislocations in front of TBs suggest that screw dislocations can be blocked kinematically by TBs due to the change of slip plane, leading to the pileup of subsequent dislocations with the elastic repulsion actually from the pinned dislocation in front of the TB. Our results well explain the experimental observations that the variation of yield strength with twin thickness for ultrafine-grained copper follows the Hall-Petch relationship.
机译：具有双晶孪晶的金属已显示出超高强度和出色的延展性，这归因于双晶边界（TBs）作为晶格位错运动的强大屏障的作用。尽管在实验和模拟中均已观察到，但结核病的屏障作用却很少进行定量研究。在这里，通过原子模拟和基于连续介质的各向异性双晶体模型，我们发现相干TB和螺钉位错之间的长程相互作用力可以忽略不计。 TB前部螺钉脱位的堆积行为的进一步模拟表明，由于滑移面的变化，TB可在运动学上阻止TB的运动，从而导致随后的脱位堆积，而实际上是钉扎前部的钉扎脱位产生了弹性排斥力结核病。我们的结果很好地说明了实验观察结果，即超细晶粒铜的屈服强度随孪晶厚度的变化遵循霍尔-帕奇关系。

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