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.

LanguageEnglish (US)
Pages2747-2753
Number of pages7
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume38 A
Issue number11
DOIs
StatePublished - Nov 2007

Profile

Creep
microstructure
Microstructure
tensile properties
Tensile properties
Tensile stress
yield strength
tensile stress
Yield stress
room temperature
Creep resistance
creep properties
creep strength
strain hardening
Processing
Strain hardening
Temperature
Elongation
elongation
Elastic moduli

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

Cite this

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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 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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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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