Comparison of the microstructure, tensile, and creep behavior for Ti-24Al-17Nb-0.66Mo (Atomic Percent) and Ti-24Al-17Nb-2.3Mo (Atomic Percent) alloys

J. P. Quast, C. J. Boehlert

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Abstract

The effect of small molybdenum additions, 0.66 and 2.3 at. pct, on the microstructure, tensile, and creep behavior of a nominally Ti-24Al-17Nb (at. pct) alloy was investigated. The alloy containing 2.3 at. pct Mo contained higher body-centered-cubic (bcc) phase volume fractions, which was expected as Mo stabilizes the bcc phase. Constant load, tensile-creep experiments were performed in the stress range of 29 to 275 MPa and the temperature range of 650 °C to 710 °C, in both air and vacuum environments. In-situ creep experiments were performed inside a scanning electron microscope chamber in order to identify the deformation evolution from surface observations. From these experiments, it was evident that α2 intergranular cracking was prevalent and initiated the fracture process where the crack path followed the α2 grain boundaries. The Ti-24Al-17Nb-2.3Mo (at. pct) alloy exhibited signi.cantly lower creep rates than the Ti-24Al-17Nb-0.66Mo (at. pct) alloy, and this was associated with less contiguity of the α2 phase.

LanguageEnglish (US)
Pages529-536
Number of pages8
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume38
Issue number3
DOIs
StatePublished - Mar 2007

Profile

Creep
microstructure
Microstructure
tensile creep
Molybdenum
Experiments
molybdenum
Loads (forces)
Volume fraction
Grain boundaries
Electron microscopes
cracks
grain boundaries
electron microscopes
chambers
Vacuum
Cracks
Scanning
vacuum
scanning

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

Cite this

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abstract = "The effect of small molybdenum additions, 0.66 and 2.3 at. pct, on the microstructure, tensile, and creep behavior of a nominally Ti-24Al-17Nb (at. pct) alloy was investigated. The alloy containing 2.3 at. pct Mo contained higher body-centered-cubic (bcc) phase volume fractions, which was expected as Mo stabilizes the bcc phase. Constant load, tensile-creep experiments were performed in the stress range of 29 to 275 MPa and the temperature range of 650 °C to 710 °C, in both air and vacuum environments. In-situ creep experiments were performed inside a scanning electron microscope chamber in order to identify the deformation evolution from surface observations. From these experiments, it was evident that α2 intergranular cracking was prevalent and initiated the fracture process where the crack path followed the α2 grain boundaries. The Ti-24Al-17Nb-2.3Mo (at. pct) alloy exhibited signi.cantly lower creep rates than the Ti-24Al-17Nb-0.66Mo (at. pct) alloy, and this was associated with less contiguity of the α2 phase.",
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AB - The effect of small molybdenum additions, 0.66 and 2.3 at. pct, on the microstructure, tensile, and creep behavior of a nominally Ti-24Al-17Nb (at. pct) alloy was investigated. The alloy containing 2.3 at. pct Mo contained higher body-centered-cubic (bcc) phase volume fractions, which was expected as Mo stabilizes the bcc phase. Constant load, tensile-creep experiments were performed in the stress range of 29 to 275 MPa and the temperature range of 650 °C to 710 °C, in both air and vacuum environments. In-situ creep experiments were performed inside a scanning electron microscope chamber in order to identify the deformation evolution from surface observations. From these experiments, it was evident that α2 intergranular cracking was prevalent and initiated the fracture process where the crack path followed the α2 grain boundaries. The Ti-24Al-17Nb-2.3Mo (at. pct) alloy exhibited signi.cantly lower creep rates than the Ti-24Al-17Nb-0.66Mo (at. pct) alloy, and this was associated with less contiguity of the α2 phase.

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