期刊
ADVANCED FUNCTIONAL MATERIALS
卷 28, 期 30, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201800388
关键词
elastic fluctuations; heterogeneities; length scales; metallic glasses; shear bands
类别
资金
- DOE Office of Science [DE-AC02-06CH11357]
- Department of Materials Science and Engineering at UIUC
Suppressing crystallization of a metallic melt results in a disordered solid, also known as a metallic glass. One may conclude that a metallic glass is free of defined structural length scales beyond some atomic-scale value that characterizes short- and medium-range order. While it is well known from atomistic modeling that a metallic glass is structurally heterogeneous, heterogeneities at such a small length scale can hardly be resolved in experiments. This review highlights experimental insights into elastic fluctuations and structural heterogeneities that emerge at scales between a few nanometers and tens to hundreds of micrometers. It distinguishes between structural and property fluctuations in as-cast metallic glasses, and heterogeneities introduced by elastic and inhomogeneous plastic deformation. As-cast glasses reveal elastic fluctuations across 3 orders of magnitude, suggesting a hierarchy of length scales that can be tuned by thermomechanical processing. Similarly, nanoscale strain localization into shear bands drives the formation of structural and elastic heterogeneities at both the nano- and the microscale. It is proposed that both types of fluctuations will allow one to quantitatively define structure-property relationships via measurable length scalesan approach that has largely contributed to the engineering success of crystalline metals.
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