Metallurgical and Materials Transactions A

, Volume 43, Issue 12, pp 4819–4834 | Cite as

Microstructure Evolution and Composition Control During the Processing of Thin-Gage Metallic Foil

  • S. L. Semiatin
  • M. E. Gross
  • D. W. Matson
  • W. D. Bennett
  • C. C. Bonham
  • A. I. Ustinov
  • D. L. Ballard
Article
First Online:

Abstract

The manufacture of thin-gage superalloy and gamma-titanium-aluminide foil products via near-conventional thermomechanical processing and two different vapor-deposition methods was investigated. Thermomechanical processing was based on hot-pack rolling of plate and sheet. Foils of the superalloy LSHR and the near-gamma titanium aluminide Ti-45.5Al-2Cr-2Nb made by this approach exhibited excellent gage control and fine two-phase microstructures. The vapor-phase techniques used magnetron sputtering (MS) of a target of the desired product composition or electron-beam physical vapor deposition (EBPVD) of separate targets of the specific alloying elements. Thin deposits of LSHR and Ti-48Al-2Cr-2Nb made by MS showed uniform thickness/composition and an ultrafine microstructure. However, systematic deviations from the specific target composition were found. During subsequent heat treatment, the microstructure of the MS samples showed various degrees of grain growth and coarsening. Foils of Ti-43Al and Ti-51Al-1V fabricated by EBPVD were fully dense. The microstructures developed during EBPVD were interpreted in terms of measured phase equilibria and the dependence of evaporant flux on temperature.

Keywords

Magnetron Sputtering Wavelength Dispersive Spectroscopy Titanium Aluminide Alloy Parting Agent Evaporant Flux 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Notes

Acknowledgments

This work was conducted as part of the in-house research of the Metals Branch of the Air Force Research Laboratory’s Materials and Manufacturing Directorate. The support and encouragement of the Laboratory management and, in particular, the Air Force Office of Scientific Research (Drs. Joan Fuller and A. Sayir, program managers) are gratefully acknowledged. The assistance of M.A. Guisfredi, T.T. Gorman, and W.M. Saurber in sample characterization is appreciated. Portions of this work were conducted under the auspices of a MIPR with Pacific Northwest National Laboratory (PNNL), which is operated by the Battelle Memorial Institute for the United States Department of Energy, under Contract No. DE-AC06-76RLO1830, and AFOSR/EOARD Partner Project P-339 with Paton Institute, which was awarded through the Science and Technology Center of Ukraine (STCU).

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2012

Authors and Affiliations

  • S. L. Semiatin
    • 1
  • M. E. Gross
    • 2
  • D. W. Matson
    • 2
  • W. D. Bennett
    • 2
  • C. C. Bonham
    • 2
  • A. I. Ustinov
    • 3
  • D. L. Ballard
    • 1
  1. 1.AFRL/RXLMAir Force Research Laboratory, Materials and Manufacturing DirectorateWright-Patterson Air Force BaseUSA
  2. 2.Pacific Northwest National Laboratory, Energy and Environment DirectorateRichlandUSA
  3. 3.E.O. Paton Electric Welding Institute of the National Academy of Science of UkraineKievUkraine

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