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Thermal Stability and Hot Corrosion Performance of the AlCoCrFeNi(2.1) High-Entropy Alloy Coating by Laser Cladding
Both crack-free AlCoCrFeNi(2.1) eutectic high-entropy alloy (EHEA) and Y and Hf co-doping AlCoCrFeNi(2.1) EHEA (YHf-EHEA) coatings were prepared by laser cladding. The solidification microstructure, thermal stability, and hot corrosion performance of the coatings at 900 °C under 75% Na(2)SO(4) + 25%...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10488378/ https://www.ncbi.nlm.nih.gov/pubmed/37687440 http://dx.doi.org/10.3390/ma16175747 |
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author | Zhang, Li Ji, Yan Yang, Bin |
author_facet | Zhang, Li Ji, Yan Yang, Bin |
author_sort | Zhang, Li |
collection | PubMed |
description | Both crack-free AlCoCrFeNi(2.1) eutectic high-entropy alloy (EHEA) and Y and Hf co-doping AlCoCrFeNi(2.1) EHEA (YHf-EHEA) coatings were prepared by laser cladding. The solidification microstructure, thermal stability, and hot corrosion performance of the coatings at 900 °C under 75% Na(2)SO(4) + 25% NaCl molten salts were investigated. The experimental results showed that the structure of the as-deposited coatings consisted of FCC and BCC/B2 phases. After heat treatment, an Al-rich L1(2) phase was precipitated in the FCC phase of all coatings. The grain sizes of the EHEA and YHf-EHEA coatings after heat treatment at 900 °C for 10 h increased by 27.5% and 15.7%, respectively, compared to the as-deposited coatings. Meanwhile, after hot corrosion, the spallation areas of the YHf-EHEA and EHEA coatings accounted for 14.98% and 5.67% of the total surface area, respectively. In this study, the Y and Hf co-doping did not change the microstructure morphology and phase structure of the coatings but did improve the thermal stability and resistance of the hot corrosion oxide scale spallation, providing a certain amount of data and theoretical support for the application of EHEA coatings as high-temperature protective coatings. |
format | Online Article Text |
id | pubmed-10488378 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-104883782023-09-09 Thermal Stability and Hot Corrosion Performance of the AlCoCrFeNi(2.1) High-Entropy Alloy Coating by Laser Cladding Zhang, Li Ji, Yan Yang, Bin Materials (Basel) Article Both crack-free AlCoCrFeNi(2.1) eutectic high-entropy alloy (EHEA) and Y and Hf co-doping AlCoCrFeNi(2.1) EHEA (YHf-EHEA) coatings were prepared by laser cladding. The solidification microstructure, thermal stability, and hot corrosion performance of the coatings at 900 °C under 75% Na(2)SO(4) + 25% NaCl molten salts were investigated. The experimental results showed that the structure of the as-deposited coatings consisted of FCC and BCC/B2 phases. After heat treatment, an Al-rich L1(2) phase was precipitated in the FCC phase of all coatings. The grain sizes of the EHEA and YHf-EHEA coatings after heat treatment at 900 °C for 10 h increased by 27.5% and 15.7%, respectively, compared to the as-deposited coatings. Meanwhile, after hot corrosion, the spallation areas of the YHf-EHEA and EHEA coatings accounted for 14.98% and 5.67% of the total surface area, respectively. In this study, the Y and Hf co-doping did not change the microstructure morphology and phase structure of the coatings but did improve the thermal stability and resistance of the hot corrosion oxide scale spallation, providing a certain amount of data and theoretical support for the application of EHEA coatings as high-temperature protective coatings. MDPI 2023-08-22 /pmc/articles/PMC10488378/ /pubmed/37687440 http://dx.doi.org/10.3390/ma16175747 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Zhang, Li Ji, Yan Yang, Bin Thermal Stability and Hot Corrosion Performance of the AlCoCrFeNi(2.1) High-Entropy Alloy Coating by Laser Cladding |
title | Thermal Stability and Hot Corrosion Performance of the AlCoCrFeNi(2.1) High-Entropy Alloy Coating by Laser Cladding |
title_full | Thermal Stability and Hot Corrosion Performance of the AlCoCrFeNi(2.1) High-Entropy Alloy Coating by Laser Cladding |
title_fullStr | Thermal Stability and Hot Corrosion Performance of the AlCoCrFeNi(2.1) High-Entropy Alloy Coating by Laser Cladding |
title_full_unstemmed | Thermal Stability and Hot Corrosion Performance of the AlCoCrFeNi(2.1) High-Entropy Alloy Coating by Laser Cladding |
title_short | Thermal Stability and Hot Corrosion Performance of the AlCoCrFeNi(2.1) High-Entropy Alloy Coating by Laser Cladding |
title_sort | thermal stability and hot corrosion performance of the alcocrfeni(2.1) high-entropy alloy coating by laser cladding |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10488378/ https://www.ncbi.nlm.nih.gov/pubmed/37687440 http://dx.doi.org/10.3390/ma16175747 |
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