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3D ink-extrusion additive manufacturing of CoCrFeNi high-entropy alloy micro-lattices

Author

Listed:
  • Christoph Kenel

    (Northwestern University)

  • Nicola P. M. Casati

    (Paul Scherrer Institut)

  • David C. Dunand

    (Northwestern University)

Abstract

Additive manufacturing of high-entropy alloys combines the mechanical properties of this novel family of alloys with the geometrical freedom and complexity required by modern designs. Here, a non-beam approach to additive manufacturing of high-entropy alloys is developed based on 3D extrusion of inks containing a blend of oxide nanopowders (Co3O4 + Cr2O3 + Fe2O3 + NiO), followed by co-reduction to metals, inter-diffusion and sintering to near-full density CoCrFeNi in H2. A complex phase evolution path is observed by in-situ X-ray diffraction in extruded filaments when the oxide phases undergo reduction and the resulting metals inter-diffuse, ultimately forming face-centered-cubic equiatomic CoCrFeNi alloy. Linked to the phase evolution is a complex structural evolution, from loosely packed oxide particles in the green body to fully-annealed, metallic CoCrFeNi with 99.6 ± 0.1% relative density. CoCrFeNi micro-lattices are created with strut diameters as low as 100 μm and excellent mechanical properties at ambient and cryogenic temperatures.

Suggested Citation

  • Christoph Kenel & Nicola P. M. Casati & David C. Dunand, 2019. "3D ink-extrusion additive manufacturing of CoCrFeNi high-entropy alloy micro-lattices," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-08763-4
    DOI: 10.1038/s41467-019-08763-4
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    Cited by:

    1. Soo Young Cho & Dong Hae Ho & Yoon Young Choi & Soomook Lim & Sungjoo Lee & Ji Won Suk & Sae Byeok Jo & Jeong Ho Cho, 2022. "A general fruit acid chelation route for eco-friendly and ambient 3D printing of metals," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    2. Bin Ouyang & Yan Zeng, 2024. "The rise of high-entropy battery materials," Nature Communications, Nature, vol. 15(1), pages 1-5, December.

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