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Microstructure, Tensile, and Creep Behavior of Boron-Modified Ti-15Al-33Nb (at.%)

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Abstract

The effect of boron on the microstructure, tensile, and creep behavior of a Ti-15Al-33Nb (at. pct) alloy was investigated. In addition to the normal constituent phases present in the unmodified alloy, the boron-modified alloys contained borides enriched in titanium and niobium. These borides made up to 9 pct of the volume and were present in the form of needles/laths. Boron additions of 5 at. pct resulted in significant strengthening and stiffening and reduced elongation-to-failure. Smaller boron additions of 0.5 at. pct did not as significantly impact the RT tensile properties, but reduced the 650 °C yield strength by 45 pct. Constant load, tensile-creep experiments were performed in the stress range of 150 to 400 MPa and the temperature range of 650 °C to 710 °C, in both air and vacuum environments. The addition of 5 at. pct boron significantly improved the creep resistance, whereas the addition of 0.5 at. pct boron degraded the creep resistance. In-situ tensile-creep experiments indicated that localized grain boundary cracking was prevalent at the prior-β grain boundaries.

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Notes

  1. All compositions will be given in atomic percent unless otherwise stated.

  2. JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.

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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). The authors are grateful to Drs. Seshachacharyulu Tamirisakandala and Daniel Miracle for their helpful assistance and guidance and Gerald Wynick and Ward Votava for their technical assistance with the EMP analysis.

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Author notes

  1. C.J. Cowen (Ph.D. Graduate Student, NRC Postdoctoral Research Associate)

    Present address: Process Development Division, US DOE National Energy Technology Laboratory, Albany, OR, 97321, USA

Authors and Affiliations

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

    C.J. Cowen (Ph.D. Graduate Student, NRC Postdoctoral Research Associate) & C.J. Boehlert

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Correspondence to C.J. Boehlert.

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Manuscript submitted May 3, 2007.

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Cowen, C., Boehlert, C. Microstructure, Tensile, and Creep Behavior of Boron-Modified Ti-15Al-33Nb (at.%). Metall Mater Trans A 39, 279–293 (2008). https://doi.org/10.1007/s11661-007-9392-2

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