arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.01392cond-mat.softcond-mat.mtrl-scicond-mat.stat-mech
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块体金属玻璃的活性微观流变学

Active microrheology of a bulk metallic glass

Ji Woong Yu, S. H. E. Rahbari, Takeshi Kawasaki, Hyunggyu Park, Won Bo Lee

摘要:

在凝聚态物理中,玻璃化转变仍然是一个不清楚的问题。研究玻璃的机械性能是具有挑战性的,因为任何可能导致剪切复原的全局变形都需要天文数字般的弛豫时间。此外,众所周知,玻璃是异质的,全局扰动不能探索局部机械/输运性质。然而,基于局部探针的研究,即微观流变学,可以克服这些问题。在这里,我们建立了一个块体金属玻璃的活性微观流变学:一个探针粒子驱动到主机介质玻璃。这是一种适合于实验研究的技术。我们表明,冷却后的微观摩擦表现出二阶相变,这揭示了在异质材料的摩擦的起源。此外,我们提供了不同的证据来证明探针粒子的微观动力学和主机介质玻璃的宏观性质之间存在着很强的关系。这些研究结果建立了活性微观流变学作为一种有前途的技术,用于调查的局部性质的大块金属玻璃。

英文摘要:

The glass transition remains unclarified in condensed matter physics. Investigating the mechanical properties of glass is challenging because any global deformation that may result in shear rejuvenation requires an astronomical relaxation time. Moreover, it is well known that a glass is heterogeneous and a global perturbation cannot explore local mechanical/transport properties. However, an investigation based on a local probe, i.e. microrheology, may overcome these problems. Here, we establish active microrheology of a bulk metallic glass: a probe particle driven into host medium glass. This is a technique amenable for experimental investigations. We show that upon cooling the microscopic friction exhibits a second-order phase transition; this sheds light on the origin of friction in heterogeneous materials. Further, we provide distinct evidence to demonstrate that a strong relationship exists between the microscopic dynamics of the probe particle and the macroscopic properties of the host medium glass. These findings establish active microrheology as a promising technique for investigating the local properties of bulk metallic glass.

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