J. Joseph, M. Annasamy, P.D. Hodgson, M.R. Barnett, D.M. Fabijanic
{"title":"Exploring the limits of Fe content in Al-Co-Cr-Fe-Ni-based eutectic high entropy alloys using CALPHAD-based alloy design","authors":"J. Joseph, M. Annasamy, P.D. Hodgson, M.R. Barnett, D.M. Fabijanic","doi":"10.1016/j.jallcom.2024.175431","DOIUrl":null,"url":null,"abstract":"Using AlCoCrFeNi alloy as the reference composition, a novel NiAl(FeCoCr) eutectic high entropy alloy (EHEA) system is proposed. A strong linear relationship was established between the elemental combinations of Ni, Al and (Fe+Co+Cr)-content that evolves a similar volume fraction of B2 phase to the as-cast reference composition (volume fraction of B2 phase ∼34 %) using CALPHAD. For a fixed elemental combination of Ni and Al using the proposed criteria, the equi-atomic substitution of Co and Cr with Fe in the defined (Fe+Co+Cr)-content yields a similar as-cast phase structure to the reference composition (near the melting point such as 1300 C). From this large pool of alloy compositions, a few alloys with different elemental combinations (Fe-contents from 16.4 to 55 at%) were identified and prepared by arc melting. The as-cast EHEAs exhibited a similar lamellar microstructure and tensile properties (yield strength ∼570 MPa and ultimate strength of ∼1000 MPa) as the AlCoCrFeNi reference composition. It is thereby demonstrated that in alloys based on microstructure-driven mechanical performance, it is possible to substitute costly elements in EHEAs for lower cost Fe.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":5.8000,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Alloys and Compounds","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1016/j.jallcom.2024.175431","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Using AlCoCrFeNi alloy as the reference composition, a novel NiAl(FeCoCr) eutectic high entropy alloy (EHEA) system is proposed. A strong linear relationship was established between the elemental combinations of Ni, Al and (Fe+Co+Cr)-content that evolves a similar volume fraction of B2 phase to the as-cast reference composition (volume fraction of B2 phase ∼34 %) using CALPHAD. For a fixed elemental combination of Ni and Al using the proposed criteria, the equi-atomic substitution of Co and Cr with Fe in the defined (Fe+Co+Cr)-content yields a similar as-cast phase structure to the reference composition (near the melting point such as 1300 C). From this large pool of alloy compositions, a few alloys with different elemental combinations (Fe-contents from 16.4 to 55 at%) were identified and prepared by arc melting. The as-cast EHEAs exhibited a similar lamellar microstructure and tensile properties (yield strength ∼570 MPa and ultimate strength of ∼1000 MPa) as the AlCoCrFeNi reference composition. It is thereby demonstrated that in alloys based on microstructure-driven mechanical performance, it is possible to substitute costly elements in EHEAs for lower cost Fe.
期刊介绍:
The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.