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The indentation response of Nickel nano double gyroid lattices

Khaderi, SN and Scherer, MRJ and Hall, CE and Steiner, U and Ramamurty, U and Fleck, NA and Deshpande, VS (2017) The indentation response of Nickel nano double gyroid lattices. In: Extreme Mechanics Letters, 10 . pp. 15-23. ISSN 23524316

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Official URL: https://doi.org/10.1016/j.eml.2016.08.006


The indentation response of Nickel nano double gyroid films has been measured using a Berkovich nanoindenter and the effective mechanical properties of the Ni double gyroid lattices inferred via a multi�scale finite element analysis. The 1 µm thick double gyroid films were manufactured by block copolymer self-assembly followed by electrodeposition of the Ni resulting in two interpenetrating single gyroids of opposite chirality, an overall relative density of 38% and a cell size of about 45 nm. The measured hardness was ∼0.6 GPa with no discernable indentation size effect. A multi-scale finite element (FE) analysis revealed that the uniaxial compressive strength is approximately equal to the hardness for this compressible lattice. Thus, the 38% relative density Ni double gyroid has a strength equal to or greater than the strongest fully dense bulk Ni alloys. The FE calculations revealed that this was a consequence of that fact that the Ni in the 13 nm gyroid struts was essentially dislocation free and had a strength of about 5.7 GPa, i.e. approaching the theoretical strength value of Ni. The measurements and calculations reported here suggest that in spite of the nano gyroids having a bending-dominated topology they attain strengths higher than those reported for stretching-dominated micron scale lattice materials made via 3D printing. We thus argue that relatively fast and easy self-assembly processes are a competitive alternative to 3D printing manufacture methods for making high strength lattice materials.

Item Type: Journal Article
Publication: Extreme Mechanics Letters
Publisher: Elsevier Ltd
Additional Information: The copyright of this article belongs to the author.
Keywords: Indentation; Lattice materials, nano-lattices; Size effects
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 30 May 2022 04:48
Last Modified: 30 May 2022 04:48
URI: https://eprints.iisc.ac.in/id/eprint/72832

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