位错从纳米颗粒阵列线性络合物挣脱：塑性机制与强度标度律
Dislocation breakaway from nanoparticle array linear complexions: Plasticity mechanisms and strength scaling laws
AI总结：
本研究通过原子级建模和分子动力学模拟，揭示Ni-Al合金中纳米颗粒阵列线性络合物通过弓出与渐进脱钉机制影响位错挣脱，并提出不同于经典Orowan弓出的新强度标度律。
摘要：
线性络合物是稳定的缺陷态，其中与位错相关的应力场诱发局部相变，且该相变仅限于纳米尺度。由于这些络合物诞生于控制金属塑性的缺陷处，理解它们对后续力学性能的影响至关重要。在本工作中，采用原子级建模来理解Ni-Al合金中纳米颗粒阵列线性络合物的存在如何改变位错力学。通过分子动力学模拟，首先针对由蒙特卡洛/分子动力学方法形成的纳米颗粒阵列（代表实际构型）确定驱动位错挣脱所需的临界剪切应力，随后针对简化模型（允许以受控方式改变颗粒间距和尺寸）进行模拟。揭示了一种结合弓出和渐进脱钉的机制，从而展示了一种新的强度标度律，该标度律在关键方面不同于经典的Orowan弓出机制。
英文摘要：
Linear complexions are stable defect states, where the stress field associated with a dislocation induces a local phase transformation that remains restricted to nanoscale dimensions. As these complexions are born at the defects which control plasticity in metals, it is crucial to understand their impact on subsequent mechanical properties. In this work, atomistic modeling is used to understand how dislocation mechanics are altered by the presence of nanoparticle array linear complexions in a Ni-Al alloy. Molecular dynamics simulations are used to identify the critical shear stress needed to drive dislocation breakaway, first for nanoparticle arrays formed by Monte Carlo/molecular dynamics methods to represent realistic configurations and subsequently for simplified models that allow the effects of particle spacing and size to be varied in a controlled manner. A combined bowing and progressive unpinning mechanism is uncovered, leading to the demonstration of a new strength scaling law that differs in keys ways from classical Orowan bowing.
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