The European Physical Journal E ( IF 1.8 ) Pub Date : 2020-09-11 , DOI: 10.1140/epje/i2020-11983-6 J Yang 1 , J Duan 1, 2 , Y J Wang 1, 2 , M Q Jiang 1, 2
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Abstract.
It has been accepted that low-frequency vibrational modes are causally correlated to fundamental plastic rearrangement events in amorphous solids, irrespective of the structural details. But the mode-event relationship is far from clear. In this work, we carry out case studies using atomistic simulations of a three-dimensional Cu50Zr50 model glass under athermal, quasistatic shear. We focus on the first four plastic events, and carefully trace the spatiotemporal evolution of the associated low-frequency normal modes with applied shear strain. We reveal that these low-frequency modes get highly entangled with each other, from which the critical mode emerges spontaneously to predict a shear transformation event. But the detailed emergence picture is event by event and shear-protocol dependent, even for the first plastic event. This demonstrates that the instability of a plastic event is a result of extremely complex multiple-path choice or competition, and there is a strong, elastic interaction among neighboring instability events. At last, the generality of the present findings is shown to be applicable to covalent-bonded glasses.
Graphical abstract
中文翻译：
非晶态固体中塑料不稳定性的复杂性：振动模式的时空演化的见解。
摘要。
公认的是，低频振动模式与无定形固体中的基本塑性重排事件因果相关，而与结构细节无关。但是，模式与事件之间的关系还很不清楚。在这项工作中，我们使用三维Cu 50 Zr 50的原子模拟进行案例研究模型玻璃在非热，准静态剪切下。我们将重点放在前四个塑性事件上，并仔细跟踪伴有剪切应变的低频法向模态的时空演化。我们发现，这些低频模式彼此高度纠缠，由此临界模式自发地出现以预测剪切转变事件。但是，即使是第一个可塑性事件，详细的出现情况也取决于事件和剪切协议。这表明可塑事件的不稳定性是极其复杂的多径选择或竞争的结果，并且相邻不稳定性事件之间存在强烈的弹性相互作用。最后，本发明发现的一般性适用于共价键合的玻璃。
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