International Journal of Extreme Manufacturing, Volume. 3, Issue 2, 25101(2021)

Optimizing film thickness to delay strut fracture in high-entropy alloy composite microlattices

James Utama Surjadi1, Xiaobin Feng1, Wenzhao Zhou2, and Yang Lu1,2、*
Author Affiliations
  • 1Department of Mechanical Engineering, City University of Hong Kong, Kowloon, Hong Kong Special Administrative Region of China
  • 2Nano-Manufacturing Laboratory (NML), City University of Hong Kong Shenzhen Research Institute, Shenzhen 518057, People’s Republic of China
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    Incorporating high-entropy alloys (HEAs) in composite microlattice structures yields superior mechanical performance and desirable functional properties compared to conventional metallic lattices. However, the modulus mismatch and relatively poor adhesion between the soft polymer core and stiff metallic film coating often results in film delamination and brittle strut fracture at relatively low strain levels (typically below 10%). In this work, we demonstrate that optimizing the HEA film thickness of a CoCrNiFe-coated microlattice completely suppresses delamination, significantly delays the onset of strut fracture (~100% increase in compressive strain), and increases the specific strength by up to 50%. This work presents an efficient strategy to improve the properties of metal-composite mechanical metamaterials for structural applications.

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    James Utama Surjadi, Xiaobin Feng, Wenzhao Zhou, Yang Lu. Optimizing film thickness to delay strut fracture in high-entropy alloy composite microlattices[J]. International Journal of Extreme Manufacturing, 2021, 3(2): 25101

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    Paper Information

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    Received: Jun. 17, 2020

    Accepted: --

    Published Online: Jan. 10, 2022

    The Author Email: Lu Yang (yanglu@cityu.edu.hk)

    DOI:10.1088/2631-7990/abd8e8

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