Publication Date
2019
Journal or Book Title
Metals
Abstract
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.
DOI
https://doi.org/10.3390/met9101029
Volume
9
Special Issue
Complex Concentrated Alloys (CCAs) - Current Understanding and Future Opportunities
Issue
10
License
UMass Amherst Open Access Policy
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Ren, Jie; Mahajan, Chaitanya; Liu, Liang; Follette, David; Chen, Wen; and Mukherjee, Sundeep, "Corrosion Behavior of Selectively Laser Melted CoCrFeMnNi High Entropy Alloy" (2019). Metals. 636.
https://doi.org/10.3390/met9101029