Abstract Dislocation nucleation and interface sliding are two dominant plasticity events governing the mechanical behavior of metallic nanocomposites. Recent works have shown that both events can be closely related to atomistic interface geometries, however, how compositional factors, e.g., segregated hydrogen clusters, contribute both events are nearly unknown. Herein, we demonstrate that hydrogen clusters near misfit dislocation nodes can strongly suppress dislocation nucleation and interface sliding, while clusters at other positions will contribute somehow weaker effect on dislocation nucleation but facilitate interface sliding. These findings offer a rational atomistic mechanism for the effect of hydrogen clusters on interface facilitated plasticity.

中文翻译：

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氢簇对半相干双金属界面促进塑性的影响

摘要 位错成核和界面滑动是控制金属纳米复合材料力学行为的两个主要塑性事件。最近的工作表明，这两个事件都可能与原子界面几何结构密切相关，但是，组成因素（例如，分离的氢簇）如何促成这两个事件几乎是未知的。在这里，我们证明了错配位错节点附近的氢簇可以强烈抑制位错成核和界面滑动，而其他位置的簇会在某种程度上对位错成核的影响较弱，但促进界面滑动。这些发现为氢簇对界面促进塑性的影响提供了合理的原子机制。