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Modeling and processing of liquid-phase-sintered γ-TiAl during high-density infrared processing

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Abstract

A new method for the rapid processing of thin gage sheet of traditionally difficult-to-process materials, such as γ-TiAl, has been modeled and experimentally developed. The method uses high density infrared (HDI) rapid heating of a plasma arc lamp to liquid-phase sinter powder metal compact precursors to structures of varying densities. Material properties for precursor γ-TiAl compacts were effectively chosen or determined and then used with a finite-volume heat-transfer modeling code to model the process. With the aid of the model, processing parameters were determined that allowed for a temperature gradient across the sheet that would produce a liquid-phase cast structure on the surface, residual powder on the backside, and a middle layer solid + liquid zone. Temperature and phase fields were predicted through the thickness of the sheet using the model. Fine grain, lamellar structured materials were produced in the liquid-phase-sintered zone.

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Authors and Affiliations

  1. Strategic Analysis, 22201, Arlington, VA

    John D. K. Rivard (SETA Contractor DARPA/DSO)

  2. Oak Ridge National Laboratory, 37831, Oak Ridge, TN

    Adrian S. Sabau (Research Engineer), Graig A. Blue (Group Leader, Materials Processing Group), David C. Harper (Research Technician) & James O. Kiggans (Research Engineer)

Authors
  1. John D. K. Rivard
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  2. Adrian S. Sabau
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  3. Graig A. Blue
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  4. David C. Harper
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  5. James O. Kiggans
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Rivard, J.D.K., Sabau, A.S., Blue, G.A. et al. Modeling and processing of liquid-phase-sintered γ-TiAl during high-density infrared processing. Metall Mater Trans A 37, 1289–1299 (2006). https://doi.org/10.1007/s11661-006-1081-z

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  • DOI: https://doi.org/10.1007/s11661-006-1081-z

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