An Experimental High-Throughput to High-Fidelity Study Towards Discovering Al–Cr Containing Corrosion-Resistant Compositionally Complex Alloys.

Published

November 8, 2023

Author(s)

Debashish Sur, Emily Holcombe, William Blades, Daniel Foley, Brian DeCost, Elaf Anber, Jason Hattrick-Simpers, Karl Sieradzki, Howie Joress, John Scully, Mitra Taheri

Abstract

Compositionally complex alloys hold the promise of simultaneously attaining superior combinations of properties, such as corrosion resistance, light-weighting, and strength. Achieving this goal is a challenge due in part to a large number of possible compositions and structures in the vast alloy design space. High-throughput methods offer a path forward, but a strong connection between the synthesis of an alloy of a given composition and structure with its properties has not been fully realized to date. Here, we present the rapid identification of corrosion-resistant alloys based on combinations of Al and Cr in a base Al–Co–Cr–Fe–Ni alloy. Previously unstudied alloy stoichiometries were identified using a combination of high-throughput experimental screening coupled with key metallurgical and electrochemical corrosion tests, identifying alloys with excellent passivation behavior. The alloy native oxide performance and its self-healing attributes were probed using rapid tests in deaerated 0.1-mol/L H2SO4. Importantly, a correlation was found between the electrochemical impedance modulus of the exposure-modified air-formed film and self-healing rate of the CCAs. Multi-element extended x-ray absorption fine structure analyses connected more ordered type chemical short-range order in the Ni–Al 1st nearest-neighbor shell to poorer corrosion resistance. This report underscores the utility of high-throughput exploration of compositionally complex alloys for the identification and rapid screening of a vast stoichiometric space.

Citation

High Entropy Alloys & Materials

Pub Type

Journals

Download Paper

https://doi.org/10.1007/s44210-023-00020-0

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Keywords

Compositionally complex alloys, Multi-principal element alloys, High throughput, Combinatorial thin films, Passivity, XPS, TEM, EXAFS

Citation

Sur, D. , Holcombe, E. , Blades, W. , Foley, D. , DeCost, B. , Anber, E. , Hattrick-Simpers, J. , Sieradzki, K. , Joress, H. , Scully, J. and Taheri, M. (2023), An Experimental High-Throughput to High-Fidelity Study Towards Discovering Al–Cr Containing Corrosion-Resistant Compositionally Complex Alloys., High Entropy Alloys & Materials, [online], https://doi.org/10.1007/s44210-023-00020-0, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=935455 (Accessed April 27, 2024)