Hierarchical heterogeneity and an elastic microstructure observed in a metallic glass alloy

Tsai, Peter; Kranjc, Kelly; Flores, Katharine M.

doi:10.1016/j.actamat.2017.07.061

Cited by 57 publications

(34 citation statements)

References 52 publications

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“…The most common method to fabricate the thin film metallic glass is magnetron sputtering, which is known for its high cooling rate, high quality, and good thin film adhesion [28]. The basic sputtering technique contains the pulsed magnetron sputtering process and the direct current (DC) magnetron sputtering [29][30][31]. In previous experiments, element targets were mostly used for co-deposition and adjusting the angles of targets to control the composition of the samples in some way.…”

Section: Introductionmentioning

confidence: 99%

Fabrication, Corrosion, and Mechanical Properties of Magnetron Sputtered Cu–Zr–Al Metallic Glass Thin Film

Wei

Ying

et al. 2019

Materials

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The appearance of thin film metallic glasses (TFMGs) is gaining increasing interest because of their unique mechanical and anticorrosion properties and potential engineering applications. In this study, Cu-Zr-Al ternary thin film metallic glasses were fabricated by using DC magnetron sputtering equipment with various target powers. The evolution of the structure was systematically investigated by grazing incidence X-ray diffractometer, scanning electron microscopy, and transmission electron microscopy. The deposition rate increases with the increasing of applied target power. The as-deposited thin films show an amorphous structure. The compositional fluctuations on the nanometer scale indicate the presence of two Cu-and Zr-rich amorphous phases. The electrochemical corrosion measurements indicated that Cu-Zr-Al thin film metallic glasses had good corrosion resistance in the sulfuric acid solution. Nanoindentation results showed that the mechanical deformation was found to be homogenous and reproducible with a high value range for the hardness and modulus.

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Section: Introductionmentioning

confidence: 99%

Fabrication, Corrosion, and Mechanical Properties of Magnetron Sputtered Cu–Zr–Al Metallic Glass Thin Film

Wei

Ying

et al. 2019

Materials

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“…The modulus values were found to not correlate with the corresponding topography, and they furthermore did not strongly correlate with the local maximum shear stress of shear‐band formation (first pop‐in). The periodicity of ≈120 µm in Figure a is reflecting the line pattern of the arrays (inset of Figure a), and indicates long‐range elastic fluctuations that are ≈2 orders of magnitude larger than those reported by Tsai et al This length scale of spatial fluctuations is observed even though the volume probed under the indenter tip prior to a typical pop‐in stress is 1 order of magnitude larger than in the earlier discussed AFAM experiments and 4 orders of magnitude larger than probed with AM‐AFM in ref. .…”

Section: Experimentally Resolved Structural Length Scales In As‐prepamentioning

confidence: 45%

“…With the combined evidence of experimentally resolved spatial fluctuations of either viscoelastic damping or local elasticity that can be seen at the scale of a few nanometers, tens of nanometers, hundred nanometers, or even tens of micrometers, we conclude that as‐cast MGs seem to contain elastic (structural?) length scales covering 4 orders of magnitude.…”

Section: Experimentally Resolved Structural Length Scales In As‐prepamentioning

confidence: 94%

“…Fluctuations in elastic response within the same crystalline materials, as also evident from Figure b,c, are expected to be very small. Flores and co‐workers have recently used dynamic modulus mapping on a nanoindentation platform to explore spatial heterogeneities (variation in storage modulus

E'_{normalr}^{}

) in a Zr‐based MG . In this work, the sampled area was 3 × 3 µm 2 , which is considerably larger than probed by the previously highlighted AFM studies .…”

Section: Experimentally Resolved Structural Length Scales In As‐prepamentioning

confidence: 98%

Section: Experimentally Resolved Structural Length Scales In As‐prepamentioning

confidence: 99%

See 2 more Smart Citations

Elastic Fluctuations and Structural Heterogeneities in Metallic Glasses

Liu

Maaß

2018

Adv Funct Materials

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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 scales-an approach that has largely contributed to the engineering success of crystalline metals.

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Shear Transformation Zone Dynamics Modeling of Deformation in Metallic Glasses

Li¹,

Homer²

2018

Handbook of Materials Modeling

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Hierarchical heterogeneity and an elastic microstructure observed in a metallic glass alloy

Cited by 57 publications

References 52 publications

Fabrication, Corrosion, and Mechanical Properties of Magnetron Sputtered Cu–Zr–Al Metallic Glass Thin Film

Fabrication, Corrosion, and Mechanical Properties of Magnetron Sputtered Cu–Zr–Al Metallic Glass Thin Film

Elastic Fluctuations and Structural Heterogeneities in Metallic Glasses

Shear Transformation Zone Dynamics Modeling of Deformation in Metallic Glasses

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