Yu Ji Woong, Rahbari S H E, Kawasaki Takeshi, Park Hyunggyu, Lee Won Bo
School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 08826, Korea.
School of Physics, Korea Institute for Advanced Study, Seoul 02455, Korea.
Sci Adv. 2020 Jul 17;6(29):eaba8766. doi: 10.1126/sciadv.aba8766. eCollection 2020 Jul.
The glass transition remains unclarified in condensed matter physics. Investigating the mechanical properties of glass is challenging because any global deformation that might result in shear rejuvenation would require a prohibitively long relaxation time. Moreover, glass is well known to be heterogeneous, and a global perturbation would prevent exploration of local mechanical/transport properties. However, investigation based on a local probe, i.e., microrheology, may overcome these problems. Here, we establish active microrheology of a bulk metallic glass, via a probe particle driven into host medium glass. This technique is amenable to experimental investigations via nanoindentation tests. We provide distinct evidence of a strong relationship 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.
在凝聚态物理中，玻璃化转变仍未得到明确解释。研究玻璃的力学性能具有挑战性，因为任何可能导致剪切恢复活力的全局变形都需要长得令人望而却步的弛豫时间。此外，众所周知玻璃是不均匀的，全局扰动会阻碍对局部力学/输运性质的探索。然而，基于局部探针的研究，即微观流变学，可能会克服这些问题。在这里，我们通过将一个探针粒子驱动到主体介质玻璃中，建立了块状金属玻璃的主动微观流变学。该技术适用于通过纳米压痕测试进行实验研究。我们提供了明确的证据，证明探针粒子的微观动力学与主体介质玻璃的宏观性质之间存在密切关系。这些发现确立了主动微观流变学作为研究块状金属玻璃局部性质的一种有前途的技术。
