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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

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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 α 2 intergranular cracking was prevalent and initiated the fracture process where the crack path followed the α 2 grain boundaries. The Ti-24Al-17Nb-2.3Mo (at. pct) alloy exhibited significantly lower creep rates than the Ti-24Al-17Nb-0.66Mo (at. pct) alloy, and this was associated with less contiguity of the α 2 phase.

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ACKNOWLEDGMENTS

The authors acknowledge Dr. Michael J. Shephard (Air Force Research Laboratory) and Mr. Paul R. Smith (Research Applications Incorporated) for their assistance.

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Authors and Affiliations

  1. Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI, 48824-1226, USA

    J.P. QUAST (Graduate Student) & C.J. BOEHLERT (Assistant Professor)

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  1. J.P. QUAST
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  2. C.J. BOEHLERT
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Correspondence to C.J. BOEHLERT.

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Manuscript submitted July 27, 2006.

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QUAST, J., BOEHLERT, C. 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. Metall Mater Trans A 38, 529–536 (2007). https://doi.org/10.1007/s11661-006-9074-5

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