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Influence of Powder Metallurgical Processing Routes on Phase Formations in a Multicomponent NbSi-Alloy

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Abstract

Refractory metal silicide composites on the basis of Nbss-Nb5Si3 have been investigated as potential alternatives for nickel-base superalloys for years because of their low densities and good high-temperature strengths. NbSi-based composites are typically produced by arc-melting or casting. Samples in this study, however, were produced by powder metallurgy because of the potential for near net-shape component fabrication with very homogeneous microstructures. Either gas atomized powder or high-energy mechanically alloyed elemental powders were compacted by powder injection molding or hot isostatic pressing. Heat treatments were applied for phase stability evaluation. Slight compositional changes (oxygen, nitrogen, or iron) introduced by the processing route, i.e., powder production and consolidation, can affect phase formations and phase transitions during the process. Special focus is put on the distinction between different silicides (Nb5Si3 and Nb3Si) and silicide modifications (α-, β-, and γ-Nb5Si3), respectively. These were evaluated by x-ray diffraction and energy-dispersive spectroscopy measurements with the additional inclusion of thermodynamic calculations using the calculated phase diagram method.

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Acknowledgements

The work described in this article and the research leading to these results has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under Grant Agreement No. 266214 within the HYSOP project.

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Authors and Affiliations

  1. Physical Metallurgy, Institute of Applied Materials, Karlsruhe Institute of Technology, Karlsruhe, Germany

    C. Seemüller & M. Heilmaier

  2. Powder Technology, Fraunhofer Institute for Manufacturing Technology and Advanced Materials, Bremen, Germany

    T. Hartwig & M. Mulser

  3. IRC in Materials Processing, University of Birmingham, Birmingham, UK

    N. Adkins & M. Wickins

Authors
  1. C. Seemüller
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  2. T. Hartwig
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  3. M. Mulser
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  4. N. Adkins
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  5. M. Wickins
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  6. M. Heilmaier
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Correspondence to C. Seemüller.

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Seemüller, C., Hartwig, T., Mulser, M. et al. Influence of Powder Metallurgical Processing Routes on Phase Formations in a Multicomponent NbSi-Alloy. JOM 66, 1900–1907 (2014). https://doi.org/10.1007/s11837-014-1096-7

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  • DOI: https://doi.org/10.1007/s11837-014-1096-7

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