J. Mater. Sci. Technol. ›› 2022, Vol. 102: 159-165.DOI: 10.1016/j.jmst.2021.07.002
• Research Article • Previous Articles Next Articles
Jingbo Gaoa,1, Yuting Jinc,1, Yongqiang Fanc, Dake Xuc,*(), Lei Menga, Cong Wanga, Yuanping Yua, Deliang Zhanga,b,*(), Fuhui Wangc
Received:
2021-03-27
Revised:
2021-07-06
Accepted:
2021-07-08
Published:
2022-03-10
Online:
2021-08-06
Contact:
Dake Xu,Deliang Zhang
About author:
zhangdeliang@mail.neu.edu.cn (D. Zhang).1These authors contributed equally to this work.
Jingbo Gao, Yuting Jin, Yongqiang Fan, Dake Xu, Lei Meng, Cong Wang, Yuanping Yu, Deliang Zhang, Fuhui Wang. Fabricating antibacterial CoCrCuFeNi high-entropy alloy via selective laser melting and in-situ alloying[J]. J. Mater. Sci. Technol., 2022, 102: 159-165.
Fig. 1. (a) As-built CoCrFeCuNi HEA blocks, (b-d) SEM images of pre-alloyed CoCrFeNi, Cu and mixed CoCrFeNiCu powder, and (e-i) EDS elemental mapping of the mixed CoCrFeNiCu powder.
P (W) | v (mm ·s-1) | h (mm) | t (mm) | E (J ·mm-3) |
---|---|---|---|---|
180-300 | 1000-2000 | 0.05 | 0.03 | 60-160 |
Table 1 . Processing parameters for fabricating the HEA blocks in this study.
P (W) | v (mm ·s-1) | h (mm) | t (mm) | E (J ·mm-3) |
---|---|---|---|---|
180-300 | 1000-2000 | 0.05 | 0.03 | 60-160 |
Fig. 2. (a, b) XRD patterns of the powder blend and the SLM-HEA blocks prepared by using different energy densities. (c) SEM image and EDS elemental mappings of the horizontal section of the SLM-HEA block prepared using an energy density of 100 J/mm3.
Fig. 4. Representative stress-strain curve of the SLM-HEA block prepared using an energy density of 100 J/mm3, and the images of the compression test specimens.
Fig. 5. Biofilm and planktonic colonies of (a) S. aureus and (b) E. coli cultured on LB agar plate. The following dilutions are shown in vertical direction: (1) Planktonic S. aureus cells: 304 SS (10,000-fold), SLM-HEA (10-fold), IM-HEA (100-fold), Cu (10-fold). (2) S. aureus coupon biofilms: 304 SS (10,000-fold), SLM-HEA (10-fold), IM-HEA (100-fold), Cu (10-fold). (3) Planktonic E. coli cells: 304 SS (1000-fold), SLM-HEA (10-fold), IM-HEA (100-fold), Cu (10-fold). (4) E. coli coupon biofilms: 304 SS (1000-fold), SLM-HEA (10-fold), IM-HEA (100-fold), Cu (10-fold).
Fig. 6. Live/dead staining of bacterial attachment on coupon surfaces of (a) S. aureus and (b) E. coli after incubation with 304 SS, SLM-HEA, IM-HEA, and Cu for 24 h. Green fluorescence represents living cells while red fluorescence represents dead cells. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)
Fig. 8. Electrochemical analysis of SLM-HEA and IM-HEA. (a) Open circuit potential and Rp in the sterile medium. (b) Rct measured from the EIS data and corrosion current density icorr obtained by the potentiodynamic polarization curves. (c) Potentiodynamic polarization curves.
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