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Plastic-flow behavior and microstructural development in a cast alpha-two titanium aluminide

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Abstract

Plastic-flow behavior and microstructural development were investigated for a cast α2 titanium aluminide, Ti-24Al-11Nb (atomic percent), using the isothermal hot-compression test. Regimes of warm- and hot-working behavior were inferred from flow curves adjusted for deformation heating effects. Plots of flow stress as a function of inverse temperature and estimates of the strain-rate-sensitivity index confirmed the transition from warm to hot-working conditions over a rather narrow temperature range. Hot working in theα 2 +β phase field was also marked by a rather high activation energy (viz., ∼1080 kJ/mole) for the controlling deformation process, which appeared to consist of dynamic globularization of the ordered-α 2 phase. A sharp decrease in the activation energy was noticed when the deformation temperature was increased above the β-transus. Microstructural observations also indicated development of an unrecrystallized structure during warm working, with cavities and wedge cracks being found near the bulged free surfaces of the upset specimens. The plastic-flow phenomenology exhibited a number of similarities to that found in the wrought version of the Ti-24Al-11Nb alloy.

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Authors and Affiliations

  1. Materials Directorate, Wright Laboratory, WL/MLLN, 45433, Wright-Patterson Air Force Base, OH

    S. L. Semiatin (Senior Scientist)

  2. Materials Directorate, Wright Laboratory, Wright-Patterson Air Force Base

    K. A. Lark (Materials Engineer)

  3. Processing Science Division, Universal Energy Systems, 45432, Dayton, OH

    D. R. Barker (Senior Scientist) & V. Seetharaman (Senior Scientist)

  4. Advanced Materials Development, GE Aircraft Engines, General Electric Company, 45215, Cincinnati, OH

    B. Marquardt (Lead Engineer)

Authors
  1. S. L. Semiatin
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  2. K. A. Lark
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  3. D. R. Barker
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  4. V. Seetharaman
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  5. B. Marquardt
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Additional information

Formerly Senior Research Scientist, Metalworking Group, Battelle Memorial Institute, Columbus, OH 43201

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Semiatin, S.L., Lark, K.A., Barker, D.R. et al. Plastic-flow behavior and microstructural development in a cast alpha-two titanium aluminide. Metall Trans A 23, 295–305 (1992). https://doi.org/10.1007/BF02660872

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  • DOI: https://doi.org/10.1007/BF02660872

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