Microstructure, creep, and tensile behavior of a Ti-21Al-29Nb(at.%) orthorhombic+B2 alloy

C. J. Cowen, C. J. Boehlert

Research output: Contribution to journalArticle

  • 46 Citations

Abstract

The creep and tensile deformation behavior of a Ti-21Al-29Nb (at.%) alloy were studied. Monolithic sheet materials were produced through conventional thermomechanical processing techniques. Heat treatments at all temperatures above 1050 °C, followed by water quenching, resulted in fully-B2 microstructures. Below 1050 °C, either equiaxed or Widmanstätten O-phase precipitated within the B2 grains. RT elongation-to-failure values of less than 2% were recorded for aged microstructures containing 72-78 volume percent O phase. Tensile-creep experiments were conducted in the temperature range 650-710 °C and stress range 48-250 MPa. The measured creep exponents and activation energies suggested that the creep mechanisms were dependent on stress and microstructure. Microstructural effects on the tensile properties and creep behavior are discussed and the data was compared to that for other Ti2AlNb-based alloys.

LanguageEnglish (US)
Pages412-422
Number of pages11
JournalIntermetallics
Volume14
Issue number4
DOIs
StatePublished - Apr 2006

Profile

Creep
Microstructure
Tensile properties
Elongation
Quenching
Activation energy
Heat treatment
Temperature
Water
Processing
Experiments

Keywords

  • B. Creep
  • B. Mechanical properties at high temperatures
  • D. Widmanstätten morphology
  • F. Electron microscopy, scanning
  • F. Microscopy, various

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

Microstructure, creep, and tensile behavior of a Ti-21Al-29Nb(at.%) orthorhombic+B2 alloy. / Cowen, C. J.; Boehlert, C. J.

In: Intermetallics, Vol. 14, No. 4, 04.2006, p. 412-422.

Research output: Contribution to journalArticle

@article{668a5124815c4f92851a69959c405622,
title = "Microstructure, creep, and tensile behavior of a Ti-21Al-29Nb(at.{\%}) orthorhombic+B2 alloy",
abstract = "The creep and tensile deformation behavior of a Ti-21Al-29Nb (at.{\%}) alloy were studied. Monolithic sheet materials were produced through conventional thermomechanical processing techniques. Heat treatments at all temperatures above 1050 °C, followed by water quenching, resulted in fully-B2 microstructures. Below 1050 °C, either equiaxed or Widmanst{\"a}tten O-phase precipitated within the B2 grains. RT elongation-to-failure values of less than 2{\%} were recorded for aged microstructures containing 72-78 volume percent O phase. Tensile-creep experiments were conducted in the temperature range 650-710 °C and stress range 48-250 MPa. The measured creep exponents and activation energies suggested that the creep mechanisms were dependent on stress and microstructure. Microstructural effects on the tensile properties and creep behavior are discussed and the data was compared to that for other Ti2AlNb-based alloys.",
keywords = "B. Creep, B. Mechanical properties at high temperatures, D. Widmanst{\"a}tten morphology, F. Electron microscopy, scanning, F. Microscopy, various",
author = "Cowen, {C. J.} and Boehlert, {C. J.}",
year = "2006",
month = "4",
doi = "10.1016/j.intermet.2005.08.006",
language = "English (US)",
volume = "14",
pages = "412--422",
journal = "Intermetallics",
issn = "0966-9795",
publisher = "Elsevier Limited",
number = "4",

}

TY - JOUR

T1 - Microstructure, creep, and tensile behavior of a Ti-21Al-29Nb(at.%) orthorhombic+B2 alloy

AU - Cowen,C. J.

AU - Boehlert,C. J.

PY - 2006/4

Y1 - 2006/4

N2 - The creep and tensile deformation behavior of a Ti-21Al-29Nb (at.%) alloy were studied. Monolithic sheet materials were produced through conventional thermomechanical processing techniques. Heat treatments at all temperatures above 1050 °C, followed by water quenching, resulted in fully-B2 microstructures. Below 1050 °C, either equiaxed or Widmanstätten O-phase precipitated within the B2 grains. RT elongation-to-failure values of less than 2% were recorded for aged microstructures containing 72-78 volume percent O phase. Tensile-creep experiments were conducted in the temperature range 650-710 °C and stress range 48-250 MPa. The measured creep exponents and activation energies suggested that the creep mechanisms were dependent on stress and microstructure. Microstructural effects on the tensile properties and creep behavior are discussed and the data was compared to that for other Ti2AlNb-based alloys.

AB - The creep and tensile deformation behavior of a Ti-21Al-29Nb (at.%) alloy were studied. Monolithic sheet materials were produced through conventional thermomechanical processing techniques. Heat treatments at all temperatures above 1050 °C, followed by water quenching, resulted in fully-B2 microstructures. Below 1050 °C, either equiaxed or Widmanstätten O-phase precipitated within the B2 grains. RT elongation-to-failure values of less than 2% were recorded for aged microstructures containing 72-78 volume percent O phase. Tensile-creep experiments were conducted in the temperature range 650-710 °C and stress range 48-250 MPa. The measured creep exponents and activation energies suggested that the creep mechanisms were dependent on stress and microstructure. Microstructural effects on the tensile properties and creep behavior are discussed and the data was compared to that for other Ti2AlNb-based alloys.

KW - B. Creep

KW - B. Mechanical properties at high temperatures

KW - D. Widmanstätten morphology

KW - F. Electron microscopy, scanning

KW - F. Microscopy, various

UR - http://www.scopus.com/inward/record.url?scp=28044434389&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=28044434389&partnerID=8YFLogxK

U2 - 10.1016/j.intermet.2005.08.006

DO - 10.1016/j.intermet.2005.08.006

M3 - Article

VL - 14

SP - 412

EP - 422

JO - Intermetallics

T2 - Intermetallics

JF - Intermetallics

SN - 0966-9795

IS - 4

ER -