论文标题
散装金属玻璃的主动微流变学
Active microrheology of a bulk metallic glass
论文作者
论文摘要
玻璃过渡在凝结物理学中仍然没有划定。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恢复的全局变形都需要天文学的放松时间。此外，众所周知，玻璃是异质的，全球扰动无法探索局部机械/运输特性。但是，基于局部探针的调查，即微流变学可能会克服这些问题。在这里，我们建立了散装金属玻璃的主动微流变学：被驱动到宿主中玻璃的探针颗粒。这是一种用于实验研究的技术。我们表明，冷却后，微观摩擦会表现出二阶过渡。这阐明了异质材料中摩擦的起源。此外，我们提供了不同的证据，以证明探针粒子的微观动力学与宿主中等玻璃的宏观特性之间存在牢固的关系。这些发现建立了活跃的微流变学作为研究散装金属玻璃的局部特性的有前途的技术。
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.
