Effect of stress level on the high temperature deformation and fracture mechanisms of Ti-45Al-2Nb-2Mn-0.8 vol. pct TiB²: an 'In Situ' experimental study

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dc.contributor.author Muñoz Moreno, Rocío
dc.contributor.author Pérez Prado, María Teresa
dc.contributor.author Llorca, Javier
dc.contributor.author Ruiz Navas, Elisa María
dc.contributor.author Boehlert, Carl J.
dc.date.accessioned 2015-05-08T11:15:45Z
dc.date.available 2015-05-08T11:15:45Z
dc.date.issued 2013-04
dc.identifier.bibliographicCitation Metallurgical and Materials Transactions A (2013). 44(4), 1887-1896.
dc.identifier.issn 1073-5623 (print)
dc.identifier.issn 1543-1940 (online)
dc.identifier.uri http://hdl.handle.net/10016/20656
dc.description.abstract The effect of the applied stress on the deformation and crack nucleation and propagation mechanisms of a gamma-TiAl intermetallic alloy (Ti-45Al-2Nb-2Mn (at. pct)-0.8 vol. pct TiB2) was examined by means of in situ tensile (constant strain rate) and tensile-creep (constant load) experiments performed at 973 K (700 °C) using a scanning electron microscope. Colony boundary cracking developed during the secondary stage in creep tests at 300 and 400 MPa and during the tertiary stage of the creep tests performed at higher stresses. Colony boundary cracking was also observed in the constant strain rate tensile test. Interlamellar ledges were only found during the tensile-creep tests at high stresses (sigma > 400 MPa) and during the constant strain rate tensile test. Quantitative measurements of the nature of the crack propagation path along secondary cracks and along the primary crack indicated that colony boundaries were preferential sites for crack propagation under all the conditions investigated. The frequency of interlamellar cracking increased with stress, but this fracture mechanism was always of secondary importance. Translamellar cracking was only observed along the primary crack.
dc.description.sponsorship Funding from the Spanish Ministry of Science and Innovation through projects (MAT2009-14547-C02-01 and MAT2009-14547-C02-02) is acknowledged. The Madrid Regional Government partially supported this project through the ESTRUMAT grant (P2009/MAT-1585). CJB acknowledges the support from the Spanish Ministry of Education for his sabbatical stay in Madrid (SAB2009-0045).
dc.format.extent 10
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Springer
dc.rights © 2012 The Minerals, Metals & Materials Society and ASM International
dc.subject.other Titanium aluminide alloys
dc.subject.other Lamellar tial alloys
dc.subject.other Creep-behavior
dc.subject.other Microstructural instability
dc.subject.other Base alloys
dc.subject.other Tensile
dc.subject.other Al
dc.title Effect of stress level on the high temperature deformation and fracture mechanisms of Ti-45Al-2Nb-2Mn-0.8 vol. pct TiB²: an 'In Situ' experimental study
dc.type article
dc.description.status Publicado
dc.relation.publisherversion http://dx.doi.org/10.1007/s11661-012-1515-8
dc.subject.eciencia Materiales
dc.identifier.doi 10.1007/s11661-012-1515-8
dc.rights.accessRights openAccess
dc.relation.projectID Comunidad de Madrid. S2009/MAT-1585/ESTRUMAT
dc.type.version publishedVersion
dc.identifier.publicationfirstpage 1887
dc.identifier.publicationissue 4
dc.identifier.publicationlastpage 1896
dc.identifier.publicationtitle Metallurgical and materials transactions. A, Physical metallurgy and materials science
dc.identifier.publicationvolume 44
dc.identifier.uxxi AR/0000012382
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