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The Microstructure, Creep, and Tensile Behavior for Ti-5Al-45Nb (Atomic Percent) Fully-β Alloy

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Abstract

The microstructure, tensile, and creep behavior of a Ti-5Al-45Nb (at. pct) alloy was evaluated. The main objective of processing and characterizing this alloy was to obtain the constituent properties of a fully-β Ti-Al-Nb alloy to aid in modeling the tensile and creep properties of two-phase orthorhombic + body-centered-cubic (O + bcc) alloys. A second objective was to compare the tensile and creep behavior of this fully-β alloy to that for two-phase O + bcc alloys. This alloy exhibited a single-phase microstructure, containing the disordered bcc phase (β), after all the processing and heat treatments performed. This alloy was easily fabricated and workable; however, its creep resistance was significantly worse than that for fully-O and two-phase O + bcc alloys. The alloy exhibited little strain hardening along with a room-temperature yield strength (YS) of 545 MPa, an ultimate tensile stress (UTS) of 559 MPa, a Young’s modulus (E) of 86 GPa, and a tensile elongation to failure of 25 pct. Extensive surface slip was evident on the deformed material. Its room-temperature tensile properties were quite similar to those for a fully-β Ti-12Al-38Nb microstructure (YS = 553 MPa, UTS = 566 MPa, E = 84, and ε f  > 27 pct). Thus, the room-temperature tensile properties and behavior of fully-β Ti-Al-Nb microstructures containing 50 at. pct Ti are not sensitive to compositional variations between 5 to 12 at. pct Al and 38 to 45 at. pct Nb.

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Notes

  1. Henceforth, all alloy compositions are given in atomic percent.

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Acknowledgment

This work was supported by the National Science Foundation through Grant No. DMR-0533954.

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Authors and Affiliations

  1. Michigan State University, East Lansing, MI, 48824-1226, USA

    C.J. Cowen (formerly PhD Graduate Assistant, NRC Postdoctoral Research Associate)

  2. US DOE National Energy Technology Laboratory, Albany, OR, 97321, USA

    C.J. Cowen (formerly PhD Graduate Assistant, NRC Postdoctoral Research Associate)

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

    C.J. Boehlert (Associate Professor)

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

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Manuscript submitted January 18, 2007.

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Cowen, C., Boehlert, C. The Microstructure, Creep, and Tensile Behavior for Ti-5Al-45Nb (Atomic Percent) Fully-β Alloy. Metall Mater Trans A 38, 2747–2753 (2007). https://doi.org/10.1007/s11661-007-9322-3

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