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Creep deformation in near-γ TiAl: II. influence of carbon on creep deformation in Ti-48Al-1V-0.3C

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Abstract

The influence of interstitial strengthening and microstructure on creep deformation has been examined in the near-γ TiAl alloy Ti-48Al-lV-0.3C. Creep studies were conducted under constant load in air at 815 °C in the stress range of 50 to 200 MPa. Significant improvement in creep resistance was observed in this alloy compared with a similar alloy (Ti-49Al-lV) containing low levels of carbon (0.07 at. pct). The degree of strengthening resulting from the addition of carbon was found to be dependent on microstructure. At 815 °C and 150 MPa, the addition of carbon reduced the minimum creep rate by a factor of approximately 20 in the equiaxedy and duplex microstructures and by a factor of 3 in the fully lamellar microstructures. Carbide precipitation occurred in this alloy when aged in the temperature range of 700 °C to 950 °C. The addition of carbon leads to a decrease in the stress exponent from 4 to 3 in the duplex and equiaxedy microstructures and the inhibition of sub-boundary formation in the duplex microstructure. This suggests that solute/dislocation interaction mechanisms, rather than a direct effect of carbide precipitates, are responsible for the significant increase in creep resistance observed in this alloy.

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Authors and Affiliations

  1. Wright-Patterson Air Force Base, 45433-7817, OH

    Brian D. Worth (Visiting Scientist, the Materials Directorate)

  2. The Department of Materials Science and Engineering, The University of Michigan, 48109, Ann Arbor, MI

    J. Wayne Jones (Professor)

  3. The Materials Science Department, Ford Research Laboratory, Ford Motor Company, 48124, Dearborn, MI

    John E. Allison (Staff Scientist)

Authors
  1. Brian D. Worth
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  2. J. Wayne Jones
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  3. John E. Allison
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Brian D. Worth, formerly with the Department of Materials Science and Engineering, The University of Michigan.

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Worth, B.D., Jones, J.W. & Allison, J.E. Creep deformation in near-γ TiAl: II. influence of carbon on creep deformation in Ti-48Al-1V-0.3C. Metall Mater Trans A 26, 2961–2972 (1995). https://doi.org/10.1007/BF02669652

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  • DOI: https://doi.org/10.1007/BF02669652

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