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Open AccessArticle

Corrosion Behavior of Selectively Laser Melted CoCrFeMnNi High Entropy Alloy

1
Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, MA 01003, USA
2
Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203, USA
3
Advanced Digital Design and Fabrication Lab (ADDFab), University of Massachusetts, Amherst, MA 01003, USA
*
Authors to whom correspondence should be addressed.
These authors contribute equally to this work.
Metals 2019, 9(10), 1029; https://doi.org/10.3390/met9101029
Received: 21 August 2019 / Revised: 16 September 2019 / Accepted: 19 September 2019 / Published: 23 September 2019
CoCrFeMnNi high entropy alloys (HEAs) were additively manufactured (AM) by laser powder bed fusion and their corrosion resistance in 3.5 wt% NaCl solution was studied by potentiodynamic polarization and electrochemical impedance spectroscopy tests. A systematic study of AM CoCrFeMnNi HEAs’ porosity under a wide range of laser processing parameters was conducted and a processing map was constructed to identify the optimal laser processing window for CoCrFeMnNi HEAs. The near fully dense AM CoCrFeMnNi HEAs exhibit a unique non-equilibrium microstructure consisting of tortuous grain boundaries, sub-grain cellular structures, columnar dendrites, associated with some processing defects such as micro-pores. Compared with conventional as-cast counterpart, the AM CoCrFeMnNi HEAs showed higher pitting resistance (ΔE) and greater polarization resistance (Rp). The superior corrosion resistance of AM CoCrFeMnNi HEAs may be attributed to the homogeneous elemental distribution and lower density of micro-pores. Our study widens the toolbox to manufacture HEAs with exceptional corrosion resistance by additive manufacturing. View Full-Text
Keywords: CoCrFeMnNi high entropy alloys; additive manufacturing; corrosion behavior; non-equilibrium microstructure; micro-pores CoCrFeMnNi high entropy alloys; additive manufacturing; corrosion behavior; non-equilibrium microstructure; micro-pores
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MDPI and ACS Style

Ren, J.; Mahajan, C.; Liu, L.; Follette, D.; Chen, W.; Mukherjee, S. Corrosion Behavior of Selectively Laser Melted CoCrFeMnNi High Entropy Alloy. Metals 2019, 9, 1029.

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