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Creep deformation in near-γ TiAl: Part 1. the influence of microstructure on creep deformation in Ti-49Al-1V

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Abstract

The influence of microstructure on creep deformation was examined in the near-y TiAl alloy Ti-49A1-1V. Specifically, microstructures with varying volume fractions of lamellar constituent were produced through thermomechanical processing. Creep studies were conducted on these various microstructures under constant load in air at temperatures between 760 °C and 870 °C and at stresses ranging from 50 to 200 MPa. Microstructure significantly influences the creep behavior of this alloy, with a fully lamellar microstructure yielding the highest creep resistance of the microstructures examined. Creep resistance is dependent on the volume fraction of lamellar constituent, with the lowest creep resistance observed at intermediate lamellar volume fractions. Examination of the creep deformation structure revealed planar slip of dislocations in the equiaxed y microstructure, while subboundary formation was observed in the duplex microstructure. The decrease in creep resistance of the duplex microstructure, compared with the equiaxed y microstructure, is attributed to an increase in dislocation mobility within the equiaxedy constituent, that results from partitioning of oxygen from the γ phase to the α2 phase. Dislocation motion in the fully lamellar microstructure was confined to the individual lamellae, with no evidence of shearing of γ/γ or γ/α2 interfaces. This suggests that the high creep resistance of the fully lamellar microstructure is a result of the fine spacing of the lamellar structure, which results in a decreased effective slip length for dislocation motion over that found in the duplex and equiaxed y microstructures.

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

    J. Wayne Jones (Professor)

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

    John E. Allison (Staff Scientist)

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  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: Part 1. the influence of microstructure on creep deformation in Ti-49Al-1V. Metall Mater Trans A 26, 2947–2959 (1995). https://doi.org/10.1007/BF02669651

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