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  Modulation of plastic flow in metallic glasses via nanoscale networks of chemical heterogeneities

Kim, J., Oh, H. S., Kim, W., Choi, P.-P., Raabe, D., & Park, E. S. (2017). Modulation of plastic flow in metallic glasses via nanoscale networks of chemical heterogeneities. Acta Materialia, 140, 116-129. doi:10.1016/j.actamat.2017.08.002.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-6418-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-641E-E
Genre: Journal Article

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 Creators:
Kim, Jinwoo1, Author              
Oh, Hyun Seok2, Author              
Kim, Wan1, Author              
Choi, Pyuck-Pa3, Author              
Raabe, Dierk4, Author              
Park, Eun Soo2, Author              
Affiliations:
1Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul, South Korea, persistent22              
2Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea, ou_persistent22              
3Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea, ou_persistent22              
4Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              

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Free keywords: ATOM-PROBE TOMOGRAPHY; PHASE-SEPARATION; FORMING ABILITY; MATRIX COMPOSITES; AMORPHOUS-ALLOYS; BULK; CU; SYSTEM; NI; DEFORMATIONMaterials Science; Metallurgy & Metallurgical Engineering; Metallic glass; Metastable miscibility gap; Chemical heterogeneity; Shear avalanche; Plasticity;
 Abstract: We systematically investigate the microstructures of metallic glasses with nanoscale networks of chemical heterogeneities introduced by the presence of a metastable miscibility gap, and their effects on modulating plastic flow of the alloys. Microstructural analysis of as-quenched alloys and the associated thermodynamic assessment in Cu-Zr-Al-Y metallic glass-forming system suggest that the existence of a metastable miscibility gap can induce not only phase-separated microstructures with sharp phase interfaces but also compositional fluctuations without a clear interface ranging from atomic scale to a few-nanometer scale in the fully amorphous alloys. The statistical analysis of shear avalanches in such compositionally heterogeneous metallic glasses reveals that chemical heterogeneities extending over a few nanometers promote a relatively large population of shear deformation units jammed before the nucleation of mature shear bands. This leads to the multiple nucleation of shear bands and sluggish deformation behavior along them. However, phase interfaces formed by phase separation inside the miscibility gap promote rapid propagation of shear bands at low flow stress, while compositional fluctuations creating non-sharp interfaces emerging at the outside of miscibility gap have relatively high resistance against shear band propagation. We hence suggest that the optimization of nanoscale compositional fluctuations in metallic glasses in terms of topology, percolation and magnitude can be an effective route for improving the materials' damage tolerance upon plastic flow. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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Language(s): eng - English
 Dates: 2017-11
 Publication Status: Published in print
 Pages: 14
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Degree: -

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Title: Acta Materialia
  Abbreviation : Acta Mater.
Source Genre: Journal
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Publ. Info: Kidlington : Elsevier Science
Pages: - Volume / Issue: 140 Sequence Number: - Start / End Page: 116 - 129 Identifier: ISSN: 1359-6454
CoNE: /journals/resource/954928603100