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Hierarchical phase evolution in a lamellar Al0.7CoCrFeNi high entropy alloy involving competing metastable and stable phases

hal.structure.identifierHigh Temperature Corrosion Research Centre
dc.contributor.authorSRIMARK, K.
hal.structure.identifierDepartment of Materials Science and Engineering [Denton]
dc.contributor.authorDASARI, Sriswaroop
hal.structure.identifierDepartment of Materials Science and Engineering [Denton]
dc.contributor.authorSHARMA, Abhishek
hal.structure.identifierDepartment of Metallurgical Engineering
dc.contributor.authorWANGYAO, P.
hal.structure.identifierPhysical and Computational Sciences Directorate
dc.contributor.authorGWALANI, Bharat
hal.structure.identifierHigh Temperature Corrosion Research Centre
dc.contributor.authorROJHIRUNSAKOOL, T.
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGORSSE, Stéphane
hal.structure.identifierDepartment of Materials Science and Engineering [Denton]
dc.contributor.authorBANERJEE, Rajarshi
dc.date.issued2021
dc.identifier.issn1359-6462
dc.description.abstractEnGuided by solution thermodynamic modeling coupled with detailed experimental characterization, the present study establishes that the alternating FCC and BCC lamellar microstructure in the Al0.7CoCrFeNi high entropy alloy, is a result of non-equilibrium partitionless solidification from the liquid to single B2 phase, followed by solid-state decomposition. Widmanstätten FCC lamellae form from the allotriomorphic FCC precipitates at the B2 grain boundaries, leading to a lamellar microstructure, divided into two distinct sub-systems. Isothermal annealing further drives these individual sub-systems towards equilibrium via precipitation of ordered intermetallic phases. The transformation in FCC lamellae initiates by the formation of metastable L12 precipitates at shorter annealing times, which are eventually replaced by the equilibrium BCC and B2 phases, forming composite B2+BCC laths, on long term annealing. These results further exemplify that interesting transformation pathways lead to hierarchical microstructures within HEAs, and the fact that as processed conditions in these alloys are often far-from equilibrium.
dc.language.isoen
dc.publisherElsevier
dc.subject.enHigh entropy alloys
dc.subject.enComplex concentrated alloys
dc.subject.enEutectic microstructure
dc.subject.enWidmanstatten
dc.subject.enIntermetallic precipitates
dc.title.enHierarchical phase evolution in a lamellar Al0.7CoCrFeNi high entropy alloy involving competing metastable and stable phases
dc.typeArticle de revue
dc.identifier.doi10.1016/j.scriptamat.2021.114137
dc.subject.halChimie/Matériaux
bordeaux.journalScripta Materialia
bordeaux.page114137
bordeaux.volume204
bordeaux.peerReviewedoui
hal.identifierhal-03335223
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03335223v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Scripta%20Materialia&rft.date=2021&rft.volume=204&rft.spage=114137&rft.epage=114137&rft.eissn=1359-6462&rft.issn=1359-6462&rft.au=SRIMARK,%20K.&DASARI,%20Sriswaroop&SHARMA,%20Abhishek&WANGYAO,%20P.&GWALANI,%20Bharat&rft.genre=article


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