Designing Corrosion-Resistant CoCrNi Medium Entropy Alloys via Short-Range Order Modification
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arXiv
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| Autores principales: | , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866909646142308352 |
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| author | Anber, Elaf A. Sur, Debashish Barnett, Annie K. Foley, Daniel L. Minor, Andrew M. DeCost, Brian L. Joress, Howie Frenkel, Anatoly I. Falk, Michael L. Scully, John R. Taheri, Mitra L. |
| author_facet | Anber, Elaf A. Sur, Debashish Barnett, Annie K. Foley, Daniel L. Minor, Andrew M. DeCost, Brian L. Joress, Howie Frenkel, Anatoly I. Falk, Michael L. Scully, John R. Taheri, Mitra L. |
| contents | Equiatomic CoCrNi medium entropy alloys are known for their unique properties linked to chemical short-range order (CSRO), crucial in both percolation processes and/or nucleation and growth processes influencing alloy passivation in aqueous environments. This study combines extended x-ray absorption fine structure, atomistic simulations, electrochemical methods, x-ray photoelectron spectroscopy, and transmission electron microscopy to explore CSRO evolution, passive film formation, as well as its characteristics in the as-homogenized CoCrNi condition, both before and after aging treatment. Results reveal a shift in local alloying element bonding environments post-aging, with simulations indicating increased Cr-Cr CSRO in 2nd nearest neighbor shells. Enhanced passive film formation kinetics and superior protection of the aged alloy in harsh acidified 3 mol/L NaCl solution indicate improved aqueous passivation correlated with Cr-Cr CSRO. This work establishes a direct connection between alloy CSRO and aqueous passivation in CoCrNi, highlighting its potential for tailored corrosion-resistant applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_09951 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Designing Corrosion-Resistant CoCrNi Medium Entropy Alloys via Short-Range Order Modification Anber, Elaf A. Sur, Debashish Barnett, Annie K. Foley, Daniel L. Minor, Andrew M. DeCost, Brian L. Joress, Howie Frenkel, Anatoly I. Falk, Michael L. Scully, John R. Taheri, Mitra L. Materials Science Equiatomic CoCrNi medium entropy alloys are known for their unique properties linked to chemical short-range order (CSRO), crucial in both percolation processes and/or nucleation and growth processes influencing alloy passivation in aqueous environments. This study combines extended x-ray absorption fine structure, atomistic simulations, electrochemical methods, x-ray photoelectron spectroscopy, and transmission electron microscopy to explore CSRO evolution, passive film formation, as well as its characteristics in the as-homogenized CoCrNi condition, both before and after aging treatment. Results reveal a shift in local alloying element bonding environments post-aging, with simulations indicating increased Cr-Cr CSRO in 2nd nearest neighbor shells. Enhanced passive film formation kinetics and superior protection of the aged alloy in harsh acidified 3 mol/L NaCl solution indicate improved aqueous passivation correlated with Cr-Cr CSRO. This work establishes a direct connection between alloy CSRO and aqueous passivation in CoCrNi, highlighting its potential for tailored corrosion-resistant applications. |
| title | Designing Corrosion-Resistant CoCrNi Medium Entropy Alloys via Short-Range Order Modification |
| topic | Materials Science |
| url | https://arxiv.org/abs/2506.09951 |