The microstructure, creep, and tensile behavior for Ti-5Al-45Nb (atomic percent) fully-β alloy

C. J. Cowen, C. J. Boehlert

    Research output: Contribution to journalArticle

    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 εf > 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.

    Original languageEnglish (US)
    Pages (from-to)2747-2753
    Number of pages7
    JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
    Volume38 A
    Issue number11
    DOIs
    StatePublished - Nov 2007

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    ASJC Scopus subject areas

    • Materials Science(all)
    • Metals and Alloys

    Cite this

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    title = "The microstructure, creep, and tensile behavior for Ti-5Al-45Nb (atomic percent) fully-β alloy",
    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 εf > 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.",
    author = "Cowen, {C. J.} and Boehlert, {C. J.}",
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    TY - JOUR

    T1 - The microstructure, creep, and tensile behavior for Ti-5Al-45Nb (atomic percent) fully-β alloy

    AU - Cowen,C. J.

    AU - Boehlert,C. J.

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    N2 - 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 εf > 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.

    AB - 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 εf > 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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