Mechanical properties of Si- and C-doped directionally solidified TiAl-Nb alloys

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dc.contributor.authorKim, SWko
dc.contributor.authorWang, Pko
dc.contributor.authorOh, MHko
dc.contributor.authorWee, Dang-Moonko
dc.contributor.authorKumar, KSko
dc.date.accessioned2013-03-04T13:57:24Z-
dc.date.available2013-03-04T13:57:24Z-
dc.date.created2012-02-06-
dc.date.created2012-02-06-
dc.date.issued2004-05-
dc.identifier.citationINTERMETALLICS, v.12, no.5, pp.499 - 509-
dc.identifier.issn0966-9795-
dc.identifier.urihttp://hdl.handle.net/10203/82860-
dc.description.abstractThe microstructure and mechanical properties of directionally solidified Ti-47Al-3Nb, Ti-47Al-3Nb-0.2Si-0.1C, Ti-47Al-3Nb-0.3Si-0.2C alloys were evaluated. The lamellar thickness of Si- and C-doped alloys was fine and uniform, and little or no precipitates were found within the lamellae or Lit inter-lamellar interfaces. Room temperature yield stress increased rapidly with increasing Si and C contents. likely due to solid solution hardening as well as clue to a reduction in lamellar spacing distribution. However, fracture toughness of "type-I" specimens of the alloys decreased marginally as Si and C were introduced and as their content increased. It is argued that the alpha(2) volume fraction decreases with increasing Si and C contents so that the frequency of delamination-type separation decreases, and this feature is thought to principally contribute to the high crack growth resistance of "type-I" specimens. Furthermore. fracture toughness of Ti-47Al-3Nb-0.2Si-0.1C alloy specimens with "type-III" orientation. polvcrystalline form, and with "type-I" orientation increased in order of "type-III" --> polycrystal --> "type-I". These results Lire discussed and the ability to obtain a respectable combination of strength and toughness through Si and C addition to a TiAlNb alloy produced by directional solidification is demonstrated. (C) 2004 Elsevier Ltd. All rights reserved.-
dc.languageEnglish-
dc.publisherELSEVIER SCI LTD-
dc.subjectGAMMA-TITANIUM ALUMINIDES-
dc.subjectFRACTURE-RESISTANCE-
dc.subjectCRACK-PROPAGATION-
dc.subjectPST CRYSTALS-
dc.subjectDEFORMATION-
dc.subjectORIENTATION-
dc.subjectTOUGHNESS-
dc.subjectBEHAVIOR-
dc.subjectSYSTEM-
dc.subjectMO-
dc.titleMechanical properties of Si- and C-doped directionally solidified TiAl-Nb alloys-
dc.typeArticle-
dc.identifier.wosid000221009600006-
dc.identifier.scopusid2-s2.0-1842581332-
dc.type.rimsART-
dc.citation.volume12-
dc.citation.issue5-
dc.citation.beginningpage499-
dc.citation.endingpage509-
dc.citation.publicationnameINTERMETALLICS-
dc.identifier.doi10.1016/j.intermet.2004.01.004-
dc.contributor.localauthorWee, Dang-Moon-
dc.contributor.nonIdAuthorKim, SW-
dc.contributor.nonIdAuthorWang, P-
dc.contributor.nonIdAuthorOh, MH-
dc.contributor.nonIdAuthorKumar, KS-
dc.type.journalArticleArticle-
dc.subject.keywordAuthortitanium aluminides, based on TiAl-
dc.subject.keywordAuthoryield stress-
dc.subject.keywordAuthorfracture toughness-
dc.subject.keywordAuthormechanical testing-
dc.subject.keywordPlusGAMMA-TITANIUM ALUMINIDES-
dc.subject.keywordPlusFRACTURE-RESISTANCE-
dc.subject.keywordPlusCRACK-PROPAGATION-
dc.subject.keywordPlusPST CRYSTALS-
dc.subject.keywordPlusDEFORMATION-
dc.subject.keywordPlusORIENTATION-
dc.subject.keywordPlusTOUGHNESS-
dc.subject.keywordPlusBEHAVIOR-
dc.subject.keywordPlusSYSTEM-
dc.subject.keywordPlusMO-
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