金属纳米层状材料中界面主导的塑性和扭折带
Interface-dominated plasticity and kink bands in metallic nanolaminates
AI总结：
本研究利用有限变形细观场位错力学框架模拟Cu-Nb纳米金属层状材料，揭示了层状平行压缩下扭折带的形成机制，并通过界面连续性条件实现塑性流动的跨层沟通。
摘要：
本文采用有限变形细观场位错力学（MFDM）的理论与计算框架，以理解Cu-Nb纳米金属层状材料（NMLs）中扭折带形成的关键特征。研究中采用了一种概念上极简的、针对增材制造NMLs三维几何（包括晶体取向）的平面应变理想化模型来模拟NMLs。重要的是，MFDM的自然跳跃/界面条件要求在界面处塑性应变率（的某些分量）连续，这使得在我们的有限元实现中，塑性流动能够跨层状边界进行理论驱动的“沟通”。在与实验观察一致的层状平行压缩条件下，我们的数值模拟中出现了扭折带。在我们的理想化框架范围内，讨论了扭折带形成和取向的可能机制。我们还报告了各种参数研究的结果，这些结果为理解扭折带形成的复杂内在机制提供了初步见解和未来工作的明确问题。
英文摘要：
The theoretical and computational framework of finite deformation mesoscale field dislocation mechanics (MFDM) is used to understand the salient aspects of kink-band formation in Cu-Nb nano-metallic laminates (NMLs). A conceptually minimal, plane-strain idealization of the three-dimensional geometry, including crystalline orientation, of additively manufactured NML is used to model NMLs. Importantly, the natural jump/interface condition of MFDM imposing continuity of (certain components) of plastic strain rates across interfaces allows theory-driven `communication' of plastic flow across the laminate boundaries in our finite element implementation. Kink bands under layer parallel compression of NMLs in accord with experimental observations arise in our numerical simulations. The possible mechanisms for the formation and orientation of kink bands are discussed, within the scope of our idealized framework. We also report results corresponding to various parametric studies that provide preliminary insights and clear questions for future work on understanding the intricate underlying mechanisms for the formation of kink bands.
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