Intrinsic and extrinsic size effects in the deformation of amorphous CuZr/nanocrystalline Cu nanolaminates

Guo W, Jaegle E, Yao J, Maier V, Korte S, Schneider JM, Raabe D (2014)

Publication Status: Published

Publication Type: Journal article

Publication year: 2014

Journal

Acta Materialia Elsevier

Publisher: PERGAMON-ELSEVIER SCIENCE LTD

Book Volume: 80

Pages Range: 94-106

DOI: 10.1016/j.actamat.2014.07.027

Abstract

Introducing a soft crystalline phase into an amorphous alloy can promote the compound's ductility. Here we synthesized multilayered nanolaminates consisting of alternating amorphous Cu54Zr46 and nanocrystalline Cu layers. The Cu layer thickness was systematically varied in different samples. Mechanical loading was imposed by nanoindentation and micropillar compression. Increasing the Cu layer thickness from 10 to 100 am led to a transition from sharp, cross-phase shear banding to gradual bending and co-deformation of the two layer types (amorphous/nanocrystalline). Specimens with a sequence of 100 nm amorphous Cu54Zr46 and 50 nm Cu layers show a compressive flow stress of 2.57 +/- 0.21 GPa, matching the strength of pure CuZr metallic glass, hence exceeding the linear rule of mixtures. In pillar compression, 40% strain without fracture was achieved by the suppression of percolative shear band propagation. The results show that inserting a ductile nanocrystalline phase into a metallic glass prevents catastrophic shear banding. The mechanical response of such nanolaminates can be tuned by adjusting the layer thickness. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Authors with CRIS profile

Verena Maier Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Sandra Korte Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Additional Organisation(s)

Exzellenz-Cluster Engineering of Advanced Materials Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Related research project(s)

Layered Lightweight Composites and Graded Materials (EXC315 EAM (E3)) Exzellenz-Cluster Engineering of Advanced Materials Nov. 1, 2012 - Oct. 31, 2017

Involved external institutions

Max-Planck-Institut für Eisenforschung GmbH (MPIE) / Max Planck Institute for Iron Research DE Germany (DE) Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen DE Germany (DE) Chinese Academy of Sciences (CAS) / 中国科学院 CN China (CN)

How to cite

APA:

Guo, W., Jaegle, E., Yao, J., Maier, V., Korte, S., Schneider, J.M., & Raabe, D. (2014). Intrinsic and extrinsic size effects in the deformation of amorphous CuZr/nanocrystalline Cu nanolaminates. Acta Materialia, 80, 94-106. https://doi.org/10.1016/j.actamat.2014.07.027

MLA:

Guo, Wei, et al. "Intrinsic and extrinsic size effects in the deformation of amorphous CuZr/nanocrystalline Cu nanolaminates." Acta Materialia 80 (2014): 94-106.

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