论文标题
BCC FE中的$σ$ 11倾斜晶粒边界的双互动：新晶界的形成
Twin interaction with $Σ$11 tilt grain boundaries in BCC Fe : Formation of new grain boundaries
论文作者
论文摘要
众所周知，双胞胎是纳米晶材料中塑性变形的重要模式。结果，预计双胞胎在塑性变形过程中可以与不同的晶界（GB）相互作用。了解这些Twin-GB相互作用对于我们对材料机械行为的理解至关重要。在这项工作中，使用分子动力学（MD）模拟在BCC FE中研究了与不同$σ$ 11的对称和非对称倾斜GB的双重相互作用。结果表明，双胞胎是从裂纹或GB中核定的，并且与$σ$ 11的不对称倾斜GB的相互作用会导致形成新的GB。这个新的GB包括$ <$ 100 $> $ cottrell型固定位错。使用原子模拟揭示了负责这种新GB形成的详细原子机制。有趣的是，在与$σ$ 11 $ 11的对称倾斜GB的情况下，尚未观察到新的GB组。
It is well known that the twinning is an important mode of plastic deformation in nanocrystalline materials. As a result, it is expected that the twin can interact with different grain boundaries (GBs) during the plastic deformation. Understanding these twin-GB interactions is crucial for our understanding of mechanical behavior of materials. In this work, the twin interaction with different $Σ$11 symmetric and asymmetric tilt GBs has been investigated in BCC Fe using molecular dynamics (MD) simulations. The results indicate that twin nucleate from the crack or GB and, its interaction with $Σ$11 asymmetric tilt GBs leads to the formation of a new GB. This new GB consist of $<$100$>$ Cottrell type immobile dislocations. The detailed atomistic mechanisms responsible for this new GB formation have been revealed using atomistic simulations. Interestingly, the new GB formation has not been observed in the case of twin interaction with $Σ$11 symmetric tilt GBs.
