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Title: High-Entropy Alloy (HEA)-coated nanolattice structures and their mechanical properties
Authors: Gao, L
Song, J
Jiao, Z 
Liao, W
Luan, J
Surjadi, JU
Li, J
Zhang, H
Sun, D
Liu, CT
Lu, Y
Keywords: High-entropy alloy (HEA)
In situ mechanical testing
Structural metamaterials
Two-photon lithography (TPL)
Issue Date: 2018
Publisher: Wiley-VCH
Source: Advanced engineering materials, 2018, v. 20, no. 1, 1700625 How to cite?
Journal: Advanced engineering materials 
Abstract: Nanolattice structure fabricated by two-photon lithography (TPL) is a coupling of size-dependent mechanical properties at micro/nano-scale with structural geometry responses in wide applications of scalable micro/nano-manufacturing. In this work, three-dimensional (3D) polymeric nanolattices are initially fabricated using TPL, then conformably coated with an 80nm thick high-entropy alloy (HEA) thin film (CoCrFeNiAl0.3) via physical vapor deposition (PVD). 3D atomic-probe tomography (APT) reveals the homogeneous element distribution in the synthesized HEA film deposited on the substrate. Mechanical properties of the obtained composite architectures are investigated via in situ scanning electron microscope (SEM) compression test, as well as finite element method (FEM) at the relevant length scales. The presented HEA-coated nanolattice encouragingly not only exhibits superior compressive specific strength of ≈0.032MPakg-1m3 with density well below 1000kgm-3, but also shows good compression ductility due to its composite nature. This concept of combining HEA with polymer lattice structures demonstrates the potential of fabricating novel architected metamaterials with tunable mechanical properties.
ISSN: 1438-1656
EISSN: 1527-2648
DOI: 10.1002/adem.201700625
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