Prediction of crack paths based upon detailed microstructure characterization in a neair-γ TiAl Alloy

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

    • 4 Citations

    Abstract

    Fracture in a duplex γ -TiAl alloy with equiaxed grains has been studied. The crack path in a notched Mode I crack growth specimen was analyzed using a combination of orientation imaging microscopy and selected angle channeling patterns (to obtain the true c-axis orientation in each grain). A phenomenological fracture propagation parameter incorporating the contributions from deformation twinning and ordinary dislocation systems has been developed that is capable of identifying boundaries that are likely to nucleate microcracks. This fracture propagation parameter was then used to analyze the existing crack path to identify why sharp turns in the crack path occurred. With this understanding, grain boundaries in the microstructure ahead of the crack tip were analyzed to predict the expected fracture path, and to compare it to the actual crack path. Based upon this parameter, criteria for crystal orientations and misorientations for high toughness microstructures are proposed.

    Original languageEnglish (US)
    Title of host publicationMaterials Damage Prognosis - Proceedings of a Symposium of the Materials Science and Technology 2004 Conference
    EditorsJ.M. Larsen, L. Christodoulou, J.R. Calcaterra, M.L. Dent, M.M. Derriso, W.J. Hardman, J. Wayne Jones, S.M. Rusa
    Pages307-314
    Number of pages8
    StatePublished - 2005
    EventMaterials Damage Prognosis - a Symposium of the Materials Science and Technology 2004 Conference - New Orleans, LA, United States

    Other

    OtherMaterials Damage Prognosis - a Symposium of the Materials Science and Technology 2004 Conference
    CountryUnited States
    CityNew Orleans, LA
    Period9/26/049/30/04

    Profile

    Cracks
    Microstructure
    Crack propagation
    Twinning
    Microcracks
    Dislocations (crystals)
    Crack tips
    Crystal orientation
    Toughness
    Microscopic examination
    Grain boundaries
    Imaging techniques

    Keywords

    • Crack Propagation
    • Fracture
    • Microcrack
    • TiAl
    • Twinning

    ASJC Scopus subject areas

    • Engineering(all)

    Cite this

    Ng, B. C., Bieler, T. R., Crimp, M. A., & Mason, D. E. (2005). Prediction of crack paths based upon detailed microstructure characterization in a neair-γ TiAl Alloy. In J. M. Larsen, L. Christodoulou, J. R. Calcaterra, M. L. Dent, M. M. Derriso, W. J. Hardman, J. Wayne Jones, ... S. M. Rusa (Eds.), Materials Damage Prognosis - Proceedings of a Symposium of the Materials Science and Technology 2004 Conference (pp. 307-314)

    Prediction of crack paths based upon detailed microstructure characterization in a neair-γ TiAl Alloy. / Ng, B. C.; Bieler, T. R.; Crimp, M. A.; Mason, D. E.

    Materials Damage Prognosis - Proceedings of a Symposium of the Materials Science and Technology 2004 Conference. ed. / J.M. Larsen; L. Christodoulou; J.R. Calcaterra; M.L. Dent; M.M. Derriso; W.J. Hardman; J. Wayne Jones; S.M. Rusa. 2005. p. 307-314.

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

    Ng, BC, Bieler, TR, Crimp, MA & Mason, DE 2005, Prediction of crack paths based upon detailed microstructure characterization in a neair-γ TiAl Alloy. in JM Larsen, L Christodoulou, JR Calcaterra, ML Dent, MM Derriso, WJ Hardman, J Wayne Jones & SM Rusa (eds), Materials Damage Prognosis - Proceedings of a Symposium of the Materials Science and Technology 2004 Conference. pp. 307-314, Materials Damage Prognosis - a Symposium of the Materials Science and Technology 2004 Conference, New Orleans, LA, United States, 26-30 September.
    Ng BC, Bieler TR, Crimp MA, Mason DE. Prediction of crack paths based upon detailed microstructure characterization in a neair-γ TiAl Alloy. In Larsen JM, Christodoulou L, Calcaterra JR, Dent ML, Derriso MM, Hardman WJ, Wayne Jones J, Rusa SM, editors, Materials Damage Prognosis - Proceedings of a Symposium of the Materials Science and Technology 2004 Conference. 2005. p. 307-314.

    Ng, B. C.; Bieler, T. R.; Crimp, M. A.; Mason, D. E. / Prediction of crack paths based upon detailed microstructure characterization in a neair-γ TiAl Alloy.

    Materials Damage Prognosis - Proceedings of a Symposium of the Materials Science and Technology 2004 Conference. ed. / J.M. Larsen; L. Christodoulou; J.R. Calcaterra; M.L. Dent; M.M. Derriso; W.J. Hardman; J. Wayne Jones; S.M. Rusa. 2005. p. 307-314.

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

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    abstract = "Fracture in a duplex γ -TiAl alloy with equiaxed grains has been studied. The crack path in a notched Mode I crack growth specimen was analyzed using a combination of orientation imaging microscopy and selected angle channeling patterns (to obtain the true c-axis orientation in each grain). A phenomenological fracture propagation parameter incorporating the contributions from deformation twinning and ordinary dislocation systems has been developed that is capable of identifying boundaries that are likely to nucleate microcracks. This fracture propagation parameter was then used to analyze the existing crack path to identify why sharp turns in the crack path occurred. With this understanding, grain boundaries in the microstructure ahead of the crack tip were analyzed to predict the expected fracture path, and to compare it to the actual crack path. Based upon this parameter, criteria for crystal orientations and misorientations for high toughness microstructures are proposed.",
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