A novel Cu-doped high entropy alloy with excellent comprehensive performances for marine application

doi:10.1016/j.jmst.2020.08.016

Abstract

Abstract:

High entropy alloy (HEA) has attracted great interests as one of the promising multifunctional materials in marine applications. However, Cu as an effective biocide tends to form segregation in HEA, which could deteriorate corrosion and induce brittle fracture. Herein, we report a strategy to tailor the existing form of Cu in HEA from undesired large-scale segregation to uniform distribution with dispersed nanoscale precipitation, while retaining the unique structure characteristics of HEA. Eliminating Cu segregation improves toughness and avoids serious corrosion in the grain boundary. Uniform distribution with dispersed nanoscale precipitation of Cu further enhances the antifouling and lubricating abilities of Cu-doped HEA. Tailored AlCoCrFeNiCu_0.5 HEA in this work has excellent comprehensive properties combining good mechanical properties, outstanding antifouling abilities, superior resistance to corrosion and wear. Furthermore, the corresponded mechanisms are discussed in terms of Cu-segregation-eliminated, nanoscale-Cu-precipitate-forming and comprehensive properties.

Key words: High entropy alloys, Copper, Nanoscale precipitate, Comprehensive properties, Ocean

Yuan Yu, Nannan Xu, Shengyu Zhu, Zhuhui Qiao, Jianbin Zhang, Jun Yang, Weimin Liu. A novel Cu-doped high entropy alloy with excellent comprehensive performances for marine application[J]. J. Mater. Sci. Technol., 2021, 69: 48-59.

Figures/Tables 14

Fig. 1. XRD pattern (a) and SEM morphology (b) of tailored AlCoCrFeNiCu0.5 alloy in this work.

Fig. 2. Chemical composition maps of tailored AlCoCrFeNiCu0.5 alloy.

Fig. 3. TEM-EDS elemental mappings of Al, Co, Cr, Fe, Ni, Cu in 90° weave-like structures.

Fig. 4. TEM-EDS elemental mappings of Al, Co, Cr, Fe, Ni, Cu in 60° weave-like structures.

Fig. 5. SADPs from region 1 (a) in Fig. 1(b), and region 2 (b), 3 (c), 4 (d) in Fig. 1, Fig. 3.

Fig. 6. Compressive true stress-strain curve of tailored AlCoCrFeNiCu0.5 alloy (a) and the morphology of fracture surfaces after test (b).

Fig. 7. Nyquist diagrams (a) and potentiodynamic polarization curves (b) of 304 stainless steel, as-cast AlCoCrFeNiCu0.5 alloy and tailored AlCoCrFeNiCu0.5 alloy in artificial seawater.

Fig. 8. SLCM images showing adhesion of D. tertiolecta on the surface of as-cast AlCoCrFeNi alloy (a), as-cast AlCoCrFeNi alloy (b) and tailored AlCoCrFeNiCu0.5 alloy (c), (d) the algae cell density of D. tertiolecta. D.tertiolecta was counted by optical microscope at 20× magnification and each value is the average of ten measurements.

Fig. 9. COF (a) and wear rate (b) of different alloys in artificial seawater.

Fig. 10. 2D depth curves in the middle line of the wear scar of as-cast AlCoCrFeNi alloy (a), as-cast AlCoCrFeNiCu0.5 alloy (b) and tailored AlCoCrFeNiCu0.5 alloy (c).

Fig. 11. Schematic illustration of the technological process in this work.

Fig. 12. SEM morphology with EDS analysis of as-cast AlCoCrFeNiCu0.5 alloy (a), the corrosion morphology of as-cast AlCoCrFeNiCu0.5 alloy (b) and tailored AlCoCrFeNiCu0.5 alloy (c).

Fig. 13. Exiting form of Cu in different alloys (a), static contact angle between different alloys and artificial seawater (b).

Fig. 14. SEM images of wear tracks of A region (a) and B region (b) of as-cast AlCoCrFeNi alloy, A region (c) and B region (d) of as-cast AlCoCrFeNiCu0.5 alloy, A region (e) and B region (f) of tailored AlCoCrFeNiCu0.5 alloy in artificial seawater.

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