Effect of crystal structure and grain size on corrosion properties of AlCoCrFeNi high entropy alloy

Parakh, A. and Murty, B S and et al, . (2021) Effect of crystal structure and grain size on corrosion properties of AlCoCrFeNi high entropy alloy. Journal of Alloys and Compounds, 863 (15805). ISSN 0925-8388

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High entropy alloys (HEAs) have drawn considerable attention owing to their unique properties such as high fracture toughness, good strength–ductility combination and enhanced corrosion resistance. In this study, the corrosion resistance dependence on the crystal structure and grain size of AlCoCrFeNi HEA is investigated. AlCoCrFeNi HEA with different mixture of body centered cubic (BCC) and face centered cubic (FCC) phases is produced using sequential alloying and tested for corrosion resistance in 3.5 wt% NaCl solution. CoNi+Fe+Cr+Al (84% BCC), FeCr+Ni+Al+Co (62% BCC) and AlNi+Co+Cr+Fe (38% BCC) alloy sequences have corrosion potential of −454, −299 and −524 mV (vs. SCE), and corrosion current of 14, 0.4 and 12 µA, respectively. FCC is a tight binding lattice with higher packing fraction than BCC which made it better for corrosion resistance, but FCC is rich in elements like Co, Ni, and Fe which are easily corroded. These two competing effects lead to a nearly optimum corrosion resistance for FeCr+Ni+Al+Co alloy sequence with 62% BCC and 32% FCC. It is also observed that an increase in grain size improves corrosion resistance. The influence of different chemical elements, crystal structure and microstructure (coarse vs. nanocrystalline) on corrosion resistance is discussed.

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IITH Creators:
IITH CreatorsORCiD
Murty, B Shttps://orcid.org/0000-0002-4399-8531
Item Type: Article
Uncontrolled Keywords: Corrosion resistance, Crystal structure, High entropy alloy, Mechanical alloying, Nanocrystalline
Subjects: Others > Metallurgy Metallurgical Engineering
Materials Engineering > Materials engineering
Divisions: Department of Material Science Engineering
Depositing User: Mrs Haseena VKKM
Date Deposited: 20 Jan 2022 11:17
Last Modified: 11 Mar 2022 11:09
URI: http://raiith.iith.ac.in/id/eprint/9103
Publisher URL: https://www.sciencedirect.com/science/article/pii/...
OA policy: https://v2.sherpa.ac.uk/id/publication/13772
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