{"title":"The Influence of Heat Annealing on the Microstructural and Electrochemical Characteristics of AlCoCrFeNi2.1 Eutectic High Entropy Alloy","authors":"Mohammadreza Hadavi, Saeed Nikabadi","doi":"10.1002/maco.202414718","DOIUrl":null,"url":null,"abstract":"<div>\n \n <p>The influence of annealing on the phase structure and electrochemical properties of the AlCoCrFeNi<sub>2.1</sub> eutectic high entropy alloy produced by the induction casting method was investigated. The annealing heat treatment was conducted at 1150°C for 2 and 10 h. XRD and FESEM/EDS results showed a dual-phasic crystal structure with FCC and B2 (Al-rich) phases, with annealing reducing the B2 phase. Potentiodynamic polarization investigations revealed a decrease in corrosion current density from 1.81 × 10⁻⁶ (as-cast) to 9.42 × 10⁻⁷ (2 h) and 5.71 × 10⁻⁷ A/cm² (10 h), indicating significant improvement in corrosion resistance. EIS data corroborated these findings, with charge transfer resistance (Rct) increasing from 1.01E5 (as-cast) to 2.80E5 Ω. cm² (10 h). Overall, reducing the B2 phase leads to a decrease in corrosion pits on the corroded surface.</p></div>","PeriodicalId":18225,"journal":{"name":"Materials and Corrosion-werkstoffe Und Korrosion","volume":"76 9","pages":"1376-1384"},"PeriodicalIF":2.0000,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials and Corrosion-werkstoffe Und Korrosion","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/maco.202414718","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
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Abstract
The influence of annealing on the phase structure and electrochemical properties of the AlCoCrFeNi2.1 eutectic high entropy alloy produced by the induction casting method was investigated. The annealing heat treatment was conducted at 1150°C for 2 and 10 h. XRD and FESEM/EDS results showed a dual-phasic crystal structure with FCC and B2 (Al-rich) phases, with annealing reducing the B2 phase. Potentiodynamic polarization investigations revealed a decrease in corrosion current density from 1.81 × 10⁻⁶ (as-cast) to 9.42 × 10⁻⁷ (2 h) and 5.71 × 10⁻⁷ A/cm² (10 h), indicating significant improvement in corrosion resistance. EIS data corroborated these findings, with charge transfer resistance (Rct) increasing from 1.01E5 (as-cast) to 2.80E5 Ω. cm² (10 h). Overall, reducing the B2 phase leads to a decrease in corrosion pits on the corroded surface.
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