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Tuning the degree of chemical ordering in the solid solution of a complex concentrated alloy and its impact on mechanical properties

hal.structure.identifierDepartment of Materials Science and Engineering
dc.contributor.authorDASARI, Sriswaroop
hal.structure.identifierDepartment of Materials Science and Engineering
dc.contributor.authorJAGETIA, Abhinav
hal.structure.identifierDepartment of Materials Science and Engineering
dc.contributor.authorSHARMA, A.
hal.structure.identifierDepartment of Materials Science and Engineering
dc.contributor.authorNARTU, M.S.K.K.Y.
hal.structure.identifierDepartment of Materials Science and Engineering
dc.contributor.authorSONI, Vishal
hal.structure.identifierDepartment of Materials Science and Engineering
dc.contributor.authorGWALANI, Bharat
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGORSSE, Stéphane
hal.structure.identifierDepartment of Materials Science and Engineering
dc.contributor.authorBANERJEE, Rajarshi
dc.date.issued2021-06
dc.identifier.issn1359-6454
dc.description.abstractEnUsing the binary enthalpies of mixing in a Co-Cr-Fe-Ni base alloy system, a high entropy alloy (HEA) or complex concentrated alloy (CCA), the equiatomic CoFeNi has been identified, which should form a random solid solution. Subsequent experimental validation established that this alloy is indeed a near-ideal, random face centered cubic (FCC) solid solution. The same thermodynamic basis has been employed to systematically engineer the degree of chemical ordering within the random CoFeNi alloy, from localized domains of short-range ordering (SRO), also referred to as clustered ordering, to well-defined long-range ordered (LRO) domains, by adding controlled amounts of Al and Ti, since these elements have a strong ordering tendency (negative enthalpy of mixing) with Co, Fe, and Ni. A series of seven alloys were designed in this study, based on enthalpies of mixing among 3d transition metals. This change in the degree of chemical ordering has a strong influence on the tensile yield strength of the alloy, for the same nominal grain size, ranging from ~181 MPa in case of CoFeNi to ~793 MPa in case of the Al0.3Ti0.2Co0.7FeNi1.7 CCA. These experimentally measured yield strengths of the candidate CCAs are in close agreement with predicted values afforded by simple strengthening models.
dc.language.isoen
dc.publisherElsevier
dc.subject.enHigh entropy alloys
dc.subject.enComplex concentrated alloys
dc.subject.enOrdering
dc.subject.enClustering
dc.subject.enMechanical properties
dc.title.enTuning the degree of chemical ordering in the solid solution of a complex concentrated alloy and its impact on mechanical properties
dc.typeArticle de revue
dc.identifier.doi10.1016/j.actamat.2021.116938
dc.subject.halChimie/Matériaux
bordeaux.journalActa Materialia
bordeaux.page116938 (16 p.)
bordeaux.volume212
bordeaux.peerReviewedoui
hal.identifierhal-03247683
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03247683v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Acta%20Materialia&rft.date=2021-06&rft.volume=212&rft.spage=116938%20(16%20p.)&rft.epage=116938%20(16%20p.)&rft.eissn=1359-6454&rft.issn=1359-6454&rft.au=DASARI,%20Sriswaroop&JAGETIA,%20Abhinav&SHARMA,%20A.&NARTU,%20M.S.K.K.Y.&SONI,%20Vishal&rft.genre=article


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