块状金属玻璃中雪崩动力学随应变的演变。

IF 2.2 3区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS
Qi Huang, Kaiguo Chen, Chen Liu, Guisen Liu, Yang Shao, Chenlong Zhao, Ran Chen, Hengtong Bu, Lingti Kong, Yao Shen
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引用次数: 0

摘要

以幂律标度为特征的雪崩现象在非晶固体和许多其他非平衡系统的变形过程中被观察到。这些系统中的雪崩通常表现出尺度不变性,这是一种让人想起临界现象和普适性类的特征,尽管它们的基本性质尚不清楚。本文利用原位声发射技术对具有代表性的非晶态固体大块金属玻璃(BMG)变形过程中雪崩的特征及其演变进行了实验研究。从微塑性变形区到试样破坏,我们观察到大量的雪崩事件。在整个拉伸实验过程中,雪崩呈幂律分布,随着变形的增加,雪崩的指数从1.61降至1.49。通过定量分析各种雪崩特征的强应变依赖性,我们强调了附加系数的重要性,这些附加系数完成了广泛研究的雪崩动力学的有限尺寸标度描述,并揭示了应变介导的雪崩标度机制。通过对BMG样品中雪崩信号的表面形貌分析和光谱分析,我们得出结论,这些雪崩的潜在过程不是宏观的,如裂纹和大剪切带传播,而是与纳米尺度的微观结构调整有关。我们的结果鼓励进一步探索雪崩的微观起源,并建议超越有限尺寸尺度的理论框架值得更深入的研究。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Strain-dependent evolution of avalanche dynamics in bulk metallic glass.

Avalanche phenomena characterized by power-law scaling are observed in amorphous solids and many other nonequilibrium systems during their deformation. Avalanches in these systems often exhibit scale invariance, a feature reminiscent of critical phenomena and universality classes, although their fundamental nature remains unclear. In this paper, we use in situ acoustic emission techniques to experimentally investigate the characteristics and evolution of avalanches during the deformation process of bulk metallic glass (BMG), a representative amorphous solid. We observed abundant avalanche events from the microplastic deformation region to the failure of the sample. We find that avalanches are power-law distributed with an exponent decreasing from 1.61 to 1.49 with increasing deformation throughout the tensile experiment. By quantitatively analyzing the strong strain dependence of various avalanche characteristics, we highlight the importance of additional coefficients that complete the widely studied finite size scaling description of avalanche dynamics and revealed a strain-mediated avalanche scaling mechanism. Through surface morphology analysis and spectral analysis of avalanche signals in BMG samples, we conclude that the underlying process of these avalanches are not macroscopic, such as cracks and large shear band propagation, but is instead related to nanoscale microstructural adjustments. Our results encourage further exploration into the microscopic origins of avalanches and suggest that theoretical frameworks beyond finite-size scaling merit more in-depth investigations.

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来源期刊
Physical Review E
Physical Review E PHYSICS, FLUIDS & PLASMASPHYSICS, MATHEMAT-PHYSICS, MATHEMATICAL
CiteScore
4.50
自引率
16.70%
发文量
2110
期刊介绍: Physical Review E (PRE), broad and interdisciplinary in scope, focuses on collective phenomena of many-body systems, with statistical physics and nonlinear dynamics as the central themes of the journal. Physical Review E publishes recent developments in biological and soft matter physics including granular materials, colloids, complex fluids, liquid crystals, and polymers. The journal covers fluid dynamics and plasma physics and includes sections on computational and interdisciplinary physics, for example, complex networks.
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