Microstructure, creep, and tensile behavior of a Ti-21Al-29Nb(at.%) orthorhombic+B2 alloy

C. J. Cowen, C. J. Boehlert

    Research output: Research - peer-reviewArticle

    • 42 Citations

    Abstract

    The creep and tensile deformation behavior of a Ti-21Al-29Nb (at.%) alloy were studied. Monolithic sheet materials were produced through conventional thermomechanical processing techniques. Heat treatments at all temperatures above 1050 °C, followed by water quenching, resulted in fully-B2 microstructures. Below 1050 °C, either equiaxed or Widmanstätten O-phase precipitated within the B2 grains. RT elongation-to-failure values of less than 2% were recorded for aged microstructures containing 72-78 volume percent O phase. Tensile-creep experiments were conducted in the temperature range 650-710 °C and stress range 48-250 MPa. The measured creep exponents and activation energies suggested that the creep mechanisms were dependent on stress and microstructure. Microstructural effects on the tensile properties and creep behavior are discussed and the data was compared to that for other Ti2AlNb-based alloys.

    LanguageEnglish (US)
    Pages412-422
    Number of pages11
    JournalIntermetallics
    Volume14
    Issue number4
    DOIs
    StatePublished - Apr 2006

    Profile

    Creep
    Microstructure
    Temperature
    Tensile properties
    Elongation
    Quenching
    Activation energy
    Heat treatment
    Water
    Processing
    Experiments

    Keywords

    • B. Creep
    • B. Mechanical properties at high temperatures
    • D. Widmanstätten morphology
    • F. Electron microscopy, scanning
    • F. Microscopy, various

    ASJC Scopus subject areas

    • Metals and Alloys

    Cite this

    Microstructure, creep, and tensile behavior of a Ti-21Al-29Nb(at.%) orthorhombic+B2 alloy. / Cowen, C. J.; Boehlert, C. J.

    In: Intermetallics, Vol. 14, No. 4, 04.2006, p. 412-422.

    Research output: Research - peer-reviewArticle

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