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Comparison of the Microstructure, Tensile, and Creep Behavior for Ti-22Al-26Nb (At. Pct) and Ti-22Al-26Nb-5B (At. Pct)

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Abstract

The effect of the addition of 5 at. pct boron on the microstructure and creep behavior of a nominally Ti-22Al-26Nb (at. pct) alloy was investigated. The boron-modified alloy contained boride needles enriched in titanium and niobium, and because to these borides, this material was considered to be a discontinuously reinforced metal matrix composite. These needle-shaped borides made up to 2 pct of the volume and were up to 158-μm long and 22-μm wide. The effect of boron on the mechanical properties was evaluated through in-situ creep testing and tensile testing at room temperature (RT) and 650 °C. Overall, the addition of 5 at. pct boron proved to be detrimental to the tensile and creep behavior. The composite exhibited a brittle failure and lower elongations-to-failure than the monolithic material. The in-situ tensile and creep experiments revealed that the deformation process initiated in the boride needles, which cracked extensively, and significantly greater primary creep strains and creep rates were exhibited by the composite.

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Acknowledgments

This work was partially supported by the National Science Foundation through Grant Nos. DMR-0533954 and DMR-030992 and by an American Society of Engineering Education (ASEE) Air Force Research Laboratory (AFRL) Summer Faculty Fellowship (Contract No. F49620-02-C-0015) to CJB. The authors are grateful to Sesh Tamirisakandala, Daniel Miracle, and Fred Yolton for helpful assistance and guidance and Gerald Wynick and Ward Votava for their technical assistance with the EMP analysis.

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Authors and Affiliations

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

    C.J. Cowen (Graduate Assistant) & C.J. Boehlert (Assistant Professor)

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  1. C.J. Cowen
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  2. C.J. Boehlert
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Correspondence to C.J. Cowen.

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Cowen, C., Boehlert, C. Comparison of the Microstructure, Tensile, and Creep Behavior for Ti-22Al-26Nb (At. Pct) and Ti-22Al-26Nb-5B (At. Pct) . Metall Mater Trans A 38, 26–34 (2007). https://doi.org/10.1007/s11661-006-9004-6

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