Phase identification and effect of W on the microstructure and micro-hardness of Ti2AlNb-based intermetallic alloys

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dc.contributor.authorYang, SJko
dc.contributor.authorNam, Soo Wooko
dc.contributor.authorHagiwara, Mko
dc.date.accessioned2013-03-03T16:52:42Z-
dc.date.available2013-03-03T16:52:42Z-
dc.date.created2012-02-06-
dc.date.created2012-02-06-
dc.date.issued2003-02-
dc.identifier.citationJOURNAL OF ALLOYS AND COMPOUNDS, v.350, no.1-2, pp.280 - 287-
dc.identifier.issn0925-8388-
dc.identifier.urihttp://hdl.handle.net/10203/79555-
dc.description.abstractThe O-phase (orthorhombic Ti2AlNb phase) intermetallic alloy has been considered one of the strongest materials for high temperature application. The primary compositions of the test alloys in this paper are Ti-22Al-27Nb (at.%) and Ti-22Al-20Nb-2W (at.%). By in-situ X-ray diffraction (XRD) tests, each phase is identified and the lattice parameters of each phase are calculated for different temperatures. XRD tests show that a T2AlNb-beta phase, partially ordered b.c.c. phase, exists besides O, alpha(2) and B2 that are usually expected in the Ti-Al-Nb alloy system. In this paper, the effects of tungsten on the microstructure and micro-hardness of a Tl2AlNb-based (O+b.c.c.) alloy are investigated. The effects of W on Ti2AlNb-based intermetallic alloys are widely known to cause a refinement of microstructure and improvement of mechanical strength, however, the reason has not yet been reported. In this paper, the role of W in the improvement of mechanical strength is clarified. The main effect of W addition is not the formation of a solid solution or the formation of W-precipitates but the refinement of the Widmanstatten structure. (C) 2002 Elsevier Science B.V. All rights reserved.-
dc.languageEnglish-
dc.publisherELSEVIER SCIENCE SA-
dc.subjectORTHORHOMBIC TI-22AL-20NB-2W ALLOY-
dc.subjectTI3AL-NB ALLOY-
dc.subjectO-PHASE-
dc.titlePhase identification and effect of W on the microstructure and micro-hardness of Ti2AlNb-based intermetallic alloys-
dc.typeArticle-
dc.identifier.wosid000180890000044-
dc.type.rimsART-
dc.citation.volume350-
dc.citation.issue1-2-
dc.citation.beginningpage280-
dc.citation.endingpage287-
dc.citation.publicationnameJOURNAL OF ALLOYS AND COMPOUNDS-
dc.identifier.doi10.1016/S0925-8388(02)00956-8-
dc.contributor.nonIdAuthorYang, SJ-
dc.contributor.nonIdAuthorHagiwara, M-
dc.type.journalArticleArticle-
dc.subject.keywordAuthortransition metal compounds-
dc.subject.keywordAuthorintermetallics-
dc.subject.keywordAuthorhigh-temperature alloys-
dc.subject.keywordPlusORTHORHOMBIC TI-22AL-20NB-2W ALLOY-
dc.subject.keywordPlusTI3AL-NB ALLOY-
dc.subject.keywordPlusO-PHASE-
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