Comparison of the microstructure, tensile, and creep behavior for Ti-24Al-17Nb-0.66Mo (Atomic Percent) and Ti-24Al-17Nb-2.3Mo (Atomic Percent) alloys

J. P. Quast, C. J. Boehlert

    Research output: Research - peer-reviewArticle

    • 23 Citations

    Abstract

    The effect of small molybdenum additions, 0.66 and 2.3 at. pct, on the microstructure, tensile, and creep behavior of a nominally Ti-24Al-17Nb (at. pct) alloy was investigated. The alloy containing 2.3 at. pct Mo contained higher body-centered-cubic (bcc) phase volume fractions, which was expected as Mo stabilizes the bcc phase. Constant load, tensile-creep experiments were performed in the stress range of 29 to 275 MPa and the temperature range of 650 °C to 710 °C, in both air and vacuum environments. In-situ creep experiments were performed inside a scanning electron microscope chamber in order to identify the deformation evolution from surface observations. From these experiments, it was evident that α2 intergranular cracking was prevalent and initiated the fracture process where the crack path followed the α2 grain boundaries. The Ti-24Al-17Nb-2.3Mo (at. pct) alloy exhibited signi.cantly lower creep rates than the Ti-24Al-17Nb-0.66Mo (at. pct) alloy, and this was associated with less contiguity of the α2 phase.

    LanguageEnglish (US)
    Pages529-536
    Number of pages8
    JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
    Volume38
    Issue number3
    DOIs
    StatePublished - Mar 2007

    Profile

    Creep
    Microstructure
    microstructure
    Experiments
    Molybdenum
    Loads (forces)
    Volume fraction
    Grain boundaries
    Electron microscopes
    Vacuum
    Cracks
    Scanning
    Air
    Temperature
    tensile creep
    molybdenum
    cracks
    grain boundaries
    electron microscopes
    chambers

    ASJC Scopus subject areas

    • Materials Science(all)
    • Metals and Alloys

    Cite this

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    abstract = "The effect of small molybdenum additions, 0.66 and 2.3 at. pct, on the microstructure, tensile, and creep behavior of a nominally Ti-24Al-17Nb (at. pct) alloy was investigated. The alloy containing 2.3 at. pct Mo contained higher body-centered-cubic (bcc) phase volume fractions, which was expected as Mo stabilizes the bcc phase. Constant load, tensile-creep experiments were performed in the stress range of 29 to 275 MPa and the temperature range of 650 °C to 710 °C, in both air and vacuum environments. In-situ creep experiments were performed inside a scanning electron microscope chamber in order to identify the deformation evolution from surface observations. From these experiments, it was evident that α2 intergranular cracking was prevalent and initiated the fracture process where the crack path followed the α2 grain boundaries. The Ti-24Al-17Nb-2.3Mo (at. pct) alloy exhibited signi.cantly lower creep rates than the Ti-24Al-17Nb-0.66Mo (at. pct) alloy, and this was associated with less contiguity of the α2 phase.",
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    N2 - The effect of small molybdenum additions, 0.66 and 2.3 at. pct, on the microstructure, tensile, and creep behavior of a nominally Ti-24Al-17Nb (at. pct) alloy was investigated. The alloy containing 2.3 at. pct Mo contained higher body-centered-cubic (bcc) phase volume fractions, which was expected as Mo stabilizes the bcc phase. Constant load, tensile-creep experiments were performed in the stress range of 29 to 275 MPa and the temperature range of 650 °C to 710 °C, in both air and vacuum environments. In-situ creep experiments were performed inside a scanning electron microscope chamber in order to identify the deformation evolution from surface observations. From these experiments, it was evident that α2 intergranular cracking was prevalent and initiated the fracture process where the crack path followed the α2 grain boundaries. The Ti-24Al-17Nb-2.3Mo (at. pct) alloy exhibited signi.cantly lower creep rates than the Ti-24Al-17Nb-0.66Mo (at. pct) alloy, and this was associated with less contiguity of the α2 phase.

    AB - The effect of small molybdenum additions, 0.66 and 2.3 at. pct, on the microstructure, tensile, and creep behavior of a nominally Ti-24Al-17Nb (at. pct) alloy was investigated. The alloy containing 2.3 at. pct Mo contained higher body-centered-cubic (bcc) phase volume fractions, which was expected as Mo stabilizes the bcc phase. Constant load, tensile-creep experiments were performed in the stress range of 29 to 275 MPa and the temperature range of 650 °C to 710 °C, in both air and vacuum environments. In-situ creep experiments were performed inside a scanning electron microscope chamber in order to identify the deformation evolution from surface observations. From these experiments, it was evident that α2 intergranular cracking was prevalent and initiated the fracture process where the crack path followed the α2 grain boundaries. The Ti-24Al-17Nb-2.3Mo (at. pct) alloy exhibited signi.cantly lower creep rates than the Ti-24Al-17Nb-0.66Mo (at. pct) alloy, and this was associated with less contiguity of the α2 phase.

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