Active microrheology of a bulk metallic glass
Active microrheology of a bulk metallic glass
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大块金属玻璃的活性微流变学
DOI：
10.1126/sciadv.aba8766
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发表时间：
2020
期刊：
影响因子：
13.6
通讯作者：
Lee Won Bo
中科院分区：
文献类型：
--
作者：
Yu Ji Woong;Rahbari S. H. E.;Kawasaki Takeshi;Park Hyunggyu;Lee Won Bo
在凝聚态物理学中，玻璃化转变仍然是一个未解之谜。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非常长的弛豫时间。此外，众所周知，玻璃是异质的，全局扰动将阻止对局部机械/输运性质的探索。然而，根据当地调查，即，微流变学可以克服这些问题。在这里，我们建立了主动微观流变学的大块金属玻璃，通过探针粒子驱动到主机介质玻璃。这种技术是经得起实验研究，通过纳米压痕测试。我们提供了不同的证据之间的密切关系的探针粒子的微观动力学和主机介质玻璃的宏观性质。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。
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.