Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 884, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.161107
Keywords
High entropy alloys; Compositionally complex alloys; Multi-principal element alloys; Corrosion; Toughness; Marine
Categories
Funding
- Conselho Nacional de Desenvolvimento Cientifico e TecnologicoBrasil (CNPq) [424645/2018-1, 406765/2018-9]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES) [001]
- U.S. Department of the Navy, Office of Naval Research [N00014-18-1-2567]
- Center for Advanced Non-Ferrous Structural Alloys (CANFSA), a National Science Foundation Industry/University Cooperative Research Center (I/UCRC) at the Colorado School of Mines [1624836]
- FAPESP [2013/059878]
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The study found that increasing the Cr content can improve the mechanical properties and corrosion resistance of Cr-Co-Ni alloys, especially in a simulated seawater environment, where the Cr-rich alloy performed exceptionally well.
Cr-Co-Ni Multi-Principal Element Alloys (MPEAs) with good combinations of strength and ductility were studied to determine their attendant corrosion performance. Three alloys - Cr45Co27.5Ni27.5, Cr33.3Co33.3 Ni-33.3, and Cr25Co37.5Ni37.5 - were produced in recrystallized and cold-worked states, and their electrochemical response was tested in a simulated seawater electrolyte. Increasing the Cr content improved the yield strength (sigma y) and ultimate tensile strength (UTS), while maintaining high (> 40%) uniform elongation. Potentiodynamic polarization and electrochemical impedance spectroscopy revealed high corrosion resistance of the alloys in simulated seawater, in particular the Cr-rich alloy (Cr45Co27.5Ni27.5). Furthermore, following 40% cold work, the Cr45Co27.5Ni27.5 alloy displayed a further improvement in corrosion resistance. The Cr45Co27.5Ni27.5 alloy displays mechanical and corrosion properties that exceed those of conventional structural alloys such as Ni-superalloys, stainless steels and most 3d-transition metal MPEAs, including those without appreciable ductility. Therefore, in the present work it is shown that increasing the Cr content in Cr-Co-Ni alloys leads to a better combination of mechanical properties and corrosion resistance in saline environment, as observed especially for the Cr45Co27.5Ni27.5 alloy. (C) 2021 Elsevier B.V. All rights reserved.
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