Segregation enabled outstanding combination of mechanical and corrosion 
properties in a FeCrNi medium entropy alloy manufactured by selective laser 
melting

Duan, Heng; Liu, Bin; Fu, Ao; He, Junyang; Yang, Tao; Liu, Chain Tsuan; Liu, Yong

doi:10.1016/j.jmst.2021.05.018

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Segregation enabled outstanding combination of mechanical and corrosion properties in a FeCrNi medium entropy alloy manufactured by selective laser melting

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He, Junyang
Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
State Key Laboratory of Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha 410083, PR China;

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Citation

Duan, H., Liu, B., Fu, A., He, J., Yang, T., Liu, C. T., et al. (2022). Segregation enabled outstanding combination of mechanical and corrosion properties in a FeCrNi medium entropy alloy manufactured by selective laser melting. Journal of Materials Science & Technology, 99, 207-214. doi:10.1016/j.jmst.2021.05.018.

Cite as: https://hdl.handle.net/21.11116/0000-0009-67B2-A

Abstract

Selective laser melting (SLM) has the advantage in preparing supersaturated solid solutions due to its unique thermal field and high solidification rate. In this study, a face-centered cubic single-phase FeCrNi medium entropy alloy (MEA) with an ultrahigh Cr content (~35 at.) was additively manufactured by SLM. The as-built MEA shows a hierarchical microstructure of coarse columnar grains and submicron dislocation cell structures, where the cell boundaries are probed segregated with Cr and C and decorated with nano carbides. The appearance of these dislocation barriers results in an excellent combination of strength (σ0.2=745 MPa, σUTS=1007 MPa) and ductility (εf=31). The current MEA also shows a superb corrosion resistance with a corrosion current density of 0.06 μA cm−2 in 3.5 wt. NaCl solution, which is far lower than that of 316 L. The high content of solutioned Cr in the MEA ensures sufficient Cr supply to form an integrated Cr2O3 passive film, and the large number of cell boundaries acting as the diffusion channels lead to the fast formation of a stable passive film over the alloy surface. © 2021