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Journal Article

Eliminating deformation incompatibility in composites by gradient nanolayer architectures

MPS-Authors
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Li,  Jianjun
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
College of Mechanical and Electrical Engineering, Central South University, Changsha, Hunan 410083, China;
State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, Hunan 410083, China;

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Lu,  Wenjun
Materials Science of Mechanical Contracts, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Gibson,  James S.K.L.
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Zhang,  Siyuan
Nanoanalytics and Interfaces, Independent Max Planck Research Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Raabe,  Dierk
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Supplementary Material (public)

s41598-018-34369-9.pdf
(Supplementary material), 3MB

Citation

Li, J., Lu, W., Gibson, J. S., Zhang, S., Chen, T., Korte-Kerzel, S., et al. (2018). Eliminating deformation incompatibility in composites by gradient nanolayer architectures. Scientific Reports, 8(1): 16216. doi:10.1038/s41598-018-34369-9.


Cite as: http://hdl.handle.net/21.11116/0000-0002-7554-C
Abstract
Composite materials usually possess a severe deformation incompatibility between the soft and hard phases. Here, we show how this incompatibility problem is overcome by a novel composite design. A gradient nanolayer-structured Cu-Zr material has been synthesized by magnetron sputtering and tested by micropillar compression. The interface spacing between the alternating Cu and Zr nanolayers increases gradually by one order of magnitude from 10 nm at the surface to 100 nm in the centre. The interface spacing gradient creates a mechanical gradient in the depth direction, which generates a deformation gradient during loading that accumulates a substantial amount of geometrically necessary dislocations. These dislocations render the component layers of originally high mechanical contrast compatible. As a result, we revealed a synergetic mechanical response in the material, which is characterized by fully compatible deformation between the constituent Cu and Zr nanolayers with different thicknesses, resulting in a maximum uniform layer strain of up to 60 in the composite. The deformed pillars have a smooth surface, validating the absence of deformation incompatibility between the layers. The joint deformation response is discussed in terms of a micromechanical finite element simulation.