High-Entropy Alloy (HEA)-Coated Nanolattice Structures and Their Mechanical Properties

Libo Gao, Jian Song, Zengbao Jiao, Weibing Liao, Junhua Luan, James Utama Surjadi, Junyang Li, Hongti Zhang, Dong Sun, Chain Tsuan Liu, Yang Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

39 Citations (Scopus)

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 80 nm thick high-entropy alloy (HEA) thin film (CoCrFeNiAl 0.3) 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 ≈0.032 MPa kg −1 m 3 with density well below 1000 kg m −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.

Original languageEnglish
Article number1700625
JournalAdvanced Engineering Materials
Volume20
Issue number1
DOIs
Publication statusPublished - 1 Jan 2018

Keywords

  • high-entropy alloy (HEA)
  • in situ mechanical testing
  • nanolattice
  • structural metamaterials
  • two-photon lithography (TPL)

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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