In situ SEM observations of the tensile-creep deformation behavior and fracture mechanisms of a γ-TiAl intermetallic alloy at low and high stresses

R. Muñoz-Moreno, M. T. Pérez-Prado, E. M. Ruiz-Navas, C. J. Boehlert, J. Llorca

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    • 1 Citations

    Abstract

    The effect of stress on the deformation and crack nucleation and propagation mechanisms of a γ-TiAl intermetallic alloy (Ti-45Al-2Nb-2Mn (at.%) - 0.8v.%TiB2) was studied by means of in situ tensile (constant strain rate) and tensile-creep (constant load) experiments performed at 973 K inside a scanning electron microscope (SEM). The evolution of the microstructure and the nucleation and propagation of cracks was tracked during the high temperature mechanical tests in the SEM. Colony boundary crack nucleation was found to be activated during the secondary stage in creep tests at 300 MPa and 400 MPa and during the tertiary stage of the creep tests performed at higher stresses and at constant strain rate. Interlamellar ledges were only observed during the high stress tensile-creep tests (σ>400 MPa) and during the constant strain rate test. Quantitative measurements of the nature of the crack propagation path along secondary cracks and along the primary crack were carried out. It was found that colony boundaries were preferential sites for crack propagation under all the conditions investigated. The frequency of interlamellar cracking increased with increasing stress.

    Original languageEnglish (US)
    Title of host publicationMaterials Research Society Symposium Proceedings
    Pages65-70
    Number of pages6
    Volume1516
    DOIs
    StatePublished - 2013
    Event2012 MRS Fall Meeting - Boston, MA, United States

    Other

    Other2012 MRS Fall Meeting
    CountryUnited States
    CityBoston, MA
    Period11/25/1211/30/12

    Profile

    Creep
    Enzymes
    cracks
    Cracks
    Addison Disease
    Hospital Dental Service
    Levodopa
    Electron microscopes
    Scanning
    tensile creep
    creep tests
    strain rate
    electron microscopes
    nucleation
    scanning
    Strain rate
    Nucleation
    Carbamyl Phosphate
    Haiti
    Crack propagation

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanical Engineering
    • Mechanics of Materials

    Cite this

    Muñoz-Moreno, R., Pérez-Prado, M. T., Ruiz-Navas, E. M., Boehlert, C. J., & Llorca, J. (2013). In situ SEM observations of the tensile-creep deformation behavior and fracture mechanisms of a γ-TiAl intermetallic alloy at low and high stresses. In Materials Research Society Symposium Proceedings (Vol. 1516, pp. 65-70). DOI: 10.1557/opl.2012.1583

    In situ SEM observations of the tensile-creep deformation behavior and fracture mechanisms of a γ-TiAl intermetallic alloy at low and high stresses. / Muñoz-Moreno, R.; Pérez-Prado, M. T.; Ruiz-Navas, E. M.; Boehlert, C. J.; Llorca, J.

    Materials Research Society Symposium Proceedings. Vol. 1516 2013. p. 65-70.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Muñoz-Moreno, R, Pérez-Prado, MT, Ruiz-Navas, EM, Boehlert, CJ & Llorca, J 2013, In situ SEM observations of the tensile-creep deformation behavior and fracture mechanisms of a γ-TiAl intermetallic alloy at low and high stresses. in Materials Research Society Symposium Proceedings. vol. 1516, pp. 65-70, 2012 MRS Fall Meeting, Boston, MA, United States, 25-30 November. DOI: 10.1557/opl.2012.1583
    Muñoz-Moreno R, Pérez-Prado MT, Ruiz-Navas EM, Boehlert CJ, Llorca J. In situ SEM observations of the tensile-creep deformation behavior and fracture mechanisms of a γ-TiAl intermetallic alloy at low and high stresses. In Materials Research Society Symposium Proceedings. Vol. 1516. 2013. p. 65-70. Available from, DOI: 10.1557/opl.2012.1583

    Muñoz-Moreno, R.; Pérez-Prado, M. T.; Ruiz-Navas, E. M.; Boehlert, C. J.; Llorca, J. / In situ SEM observations of the tensile-creep deformation behavior and fracture mechanisms of a γ-TiAl intermetallic alloy at low and high stresses.

    Materials Research Society Symposium Proceedings. Vol. 1516 2013. p. 65-70.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

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