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Shear Localization and its Dependence on Microstructural Length Scales in Metallic Glass Composites

Gentile, Jonathan M. and Stauffer, Douglas D. and Hofmann, Douglas C. and Trelewicz, Jason R. (2020) Shear Localization and its Dependence on Microstructural Length Scales in Metallic Glass Composites. Materialia, 9 . Art. No. 100598. ISSN 2589-1529.

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Extrinsic approaches for the pursuit of ductility in metallic glasses have involved the introduction of a ductile crystalline phase to inhibit the propagation of a dominant shear front through the amorphous matrix material. Using nanoindentation, we explore the role of crystalline inclusions in metallic glass matrix composites with a focus on the onset of shear banding in the amorphous matrix and the nature of shear band propagation using the propensity for localization and its dependence on indentation strain rate. When indentation length scales are favorable to distribute strain to both the crystalline dendrites and amorphous matrix, we reveal a reduction in the number of detectable displacement bursts and an accompanying decrease in the magnitude of individual depth excursions from shear banding. A decrease in the stress at the onset of shear banding is also correlated with shear band trajectories interacting with the amorphous-crystalline interfaces (ACIs). Our results thus demonstrate that ACIs reducing the activation barrier for shear banding combined with dendrites arresting propagating shear fronts act to enhance the nucleation rate and in turn, promote a more homogeneous plastic response.

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Trelewicz, Jason R.0000-0002-4052-9385
Additional Information:© 2020 Published by Elsevier Ltd on behalf of Acta Materialia Inc. Received 6 January 2020, Accepted 16 January 2020, Available online 24 January 2020. Support for this work was provided through the National Science Foundation under Award 1401662 with additional support from Award 1554411. The authors gratefully acknowledge the use of electron microscopy resources in the Center for Functional Nanomaterials, which is a US DOE Office of Science Facility at Brookhaven National Laboratory under Contract No. DE-SC0012704. D.C. Hofmann acknowledges support from NASA’s Exploration Systems Mission Directorate under Contract no. NNH10ZTT001N. Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. Declaration of Competing Interest: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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Department of Energy (DOE)DE-SC0012704
Subject Keywords:Metallic glass; Shear bands; Nanoindentation; Shear localization; Composite
Record Number:CaltechAUTHORS:20200127-085357648
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Official Citation:Jonathan M. Gentile, Douglas D. Stauffer, Douglas C. Hofmann, Jason R. Trelewicz, Shear localization and its dependence on microstructural length scales in metallic glass composites, Materialia, Volume 9, 2020, 100598, ISSN 2589-1529, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100930
Deposited By: Tony Diaz
Deposited On:28 Jan 2020 18:49
Last Modified:06 Feb 2020 17:47

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