Mechanical and Corrosion Properties of Additively Manufactured CoCrFeMnNi High Entropy Alloy

Melia, Michael A.; Carroll, Jay D.; Whetten, Shaun R.; Esmaeely, Saba N.; Locke, Jenifer; White, Emma; Anderson, Iver; Chandross, Michael; Michael, Joseph R.; Argibay, Nicolas; Schindelholz, Eric J.; Kustas, Andrew B.

doi:10.1016/j.addma.2019.100833

Mechanical and Corrosion Properties of Additively Manufactured CoCrFeMnNi High Entropy Alloy

Journal Article · Mon Aug 12 00:00:00 EDT 2019 · Additive Manufacturing

DOI:https://doi.org/10.1016/j.addma.2019.100833· OSTI ID:1557785

Melia, Michael A. ^[1]; Carroll, Jay D. ^[1]; Whetten, Shaun R. ^[1]; Esmaeely, Saba N. ^[2]; Locke, Jenifer ^[2]; White, Emma ^[3]; Anderson, Iver ^[3]; Chandross, Michael ^[1]; Michael, Joseph R. ^[1]; Argibay, Nicolas ^[1]; Schindelholz, Eric J. ^[1]; Kustas, Andrew B. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
The Ohio State Univ., Columbus, OH (United States)
Ames Lab. and Iowa State Univ., Ames, IA (United States)

Here, this study investigates the mechanical and corrosion properties of as-built and annealed equiatomic CoCrFeMnNi alloy produced by laser-based directed energy deposition (DED) Additive Manufacturing (AM). The high cooling rates of DED produced a single-phase, cellular microstructure with cells on the order of 4 μm in diameter and inter-cellular regions that were enriched in Mn and Ni. Annealing created a chemically homogeneous recrystallized microstructure with a high density of annealing twins. The average yield strength of the as-built condition was 424 MPa and exceeded the annealed condition (232 MPa), however; the strain hardening rate was lower for the as-built material stemming from higher dislocation density associated with DED parts and the fine cell size. In general, the yield strength, ultimate tensile strength, and elongation-to-failure for the as-built material exceeded values from previous studies that explored other AM techniques to produce the CoCrFeMnNi alloy. Ductile fracture occurred for all specimens with dimple initiation associated with nanoscale oxide inclusions. The breakdown potential (onset of pitting corrosion) was similar for the as-built and annealed conditions at 0.40 V_Ag/AgCl when immersed in 0.6 M NaCl. Pit morphology/propagation for the as-built condition exhibited preferential corrosion of inter-cellular Ni/Mn regions leading to a tortuous pit bottom and cover, while the annealed conditions pits resembled lacy pits similar to 304 L steel. Lastly, a passive oxide film depleted in Cr cations with substantial incorporation of Mn cations is proposed as the primary mechanism for local corrosion susceptibility of the CoCrFeMnNi alloy.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC02-07CH11358; AC04-94AL85000; NA0003525

OSTI ID:: 1557785

Alternate ID(s):: OSTI ID: 1559522

Report Number(s):: IS-J--9997; SAND--2019-9793J

Journal Information:: Additive Manufacturing, Journal Name: Additive Manufacturing Journal Issue: C Vol. 29; ISSN 2214-8604

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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The origin of high-density dislocations in additively manufactured metals Wang, Ge; Ouyang, Heng; Fan, Chen Taylor & Francis https://doi.org/10.6084/m9.figshare.12204644	text	January 2020

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