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Microstructure and tensile property of a precipitation strengthened high entropy alloy processed by selective laser melting and post heat treatment

hal.structure.identifierDepartment of Materials Science and Engineering
dc.contributor.authorLIN, Wei-Chih
hal.structure.identifierDepartment of Materials Science and Engineering
hal.structure.identifierHigh Entropy Materials Center
dc.contributor.authorCHANG, Yao-Jen
hal.structure.identifierDepartment of Materials Science and Engineering
dc.contributor.authorHSU, Tzu-Hou
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
hal.structure.identifierDepartment of Materials Science and Engineering
dc.contributor.authorGORSSE, Stéphane
hal.structure.identifierWPI Advanced Institute for Materials Research [WPI-AIMR]
hal.structure.identifierInstitute for Materials Research, Tohoku University
dc.contributor.authorSUN, Fei
hal.structure.identifierInstitute for Materials Research, Tohoku University
dc.contributor.authorFURUHARA, Tadashi
hal.structure.identifierDepartment of Materials Science and Engineering
hal.structure.identifierHigh Entropy Materials Center
dc.contributor.authorYEH, An-Chou
dc.date.issued2020-12
dc.identifier.issn2214-8604
dc.description.abstractEnThe microstructure and tensile property of Al0.2Co1.5CrFeNi1.5Ti0.3 high entropy alloy (HEA) processed by selective laser melting (SLM) have been studied in comparisons to that fabricated by traditional cast & wrought (C&W) route. The C&W samples were annealed and then aged at 750 ℃ for 50 h to promote precipitation strengthening of L12 structured phase in FCC matrix. By contrast, SLM samples were aged directly at 750 ℃ for 50 h from the as-built condition, which possessed sub-micron dendritic segregation, internal stress and nano oxides; the result was a microstructure with not only L12 particles dispersion, but also L21 phase was formed at subgrain boundaries, nano oxides and dislocations were present in the matrix. The tensile properties of this HEA were significantly enhanced by the SLM and direct ageing process; the room temperature yield strength (1235 MPa) and ultimate tensile strength (1550 MPa) achieved in this work are the highest to-date for HEAs subjected to laser additive manufacturing processes. Comparing to those of C&W samples, the SLM samples at room temperature and 500 °C exhibited additional yield strengths of 284 MPa and 229 MPa, and additional ultimate tensile strengths of 240 MPa and 275 MPa, respectively. The degree of L12 phase precipitation strengthening was similar for both SLM and C&W samples subjected to the same ageing treatment, interestingly, the additional microstructure features of SLM sample provided extra strengthening contributions; detailed analysis on microstructure evolution and strengthening factors are presented and discussed in this article.
dc.language.isoen
dc.publisherElsevier
dc.title.enMicrostructure and tensile property of a precipitation strengthened high entropy alloy processed by selective laser melting and post heat treatment
dc.typeArticle de revue
dc.identifier.doi10.1016/j.addma.2020.101601
dc.subject.halChimie/Matériaux
bordeaux.journalAdditive Manufacturing
bordeaux.page101601 (10 p.)
bordeaux.volume36
bordeaux.peerReviewedoui
hal.identifierhal-02982715
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02982715v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Additive%20Manufacturing&rft.date=2020-12&rft.volume=36&rft.spage=101601%20(10%20p.)&rft.epage=101601%20(10%20p.)&rft.eissn=2214-8604&rft.issn=2214-8604&rft.au=LIN,%20Wei-Chih&CHANG,%20Yao-Jen&HSU,%20Tzu-Hou&GORSSE,%20St%C3%A9phane&SUN,%20Fei&rft.genre=article


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