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Influence of microstructure and processing on mechanical properties of advanced Nb-silicide alloys

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Abstract

In this study different powder metallurgical processing routes, commonly used for refractory metal based materials, were evaluated on their impact on mechanical properties of a multi-component Nb-20Si-23Ti-6Al-3Cr-4Hf (at.%) alloy. Powder was produced by gas-atomization or high energy mechanical alloying of elemental powders and then consolidated either by HIPing or powder injection molding (PIM). The PIM process requires fine particles. In this investigation powder batches of gas-atomized powder (< 25 μm) and mechanically alloyed powder (< 25 μm) were compacted via PIM. Fine (< 25 μm) and coarser (106-225 μm) particle fractions of gas-atomized powder were compacted via HIPing for comparison. Quantitative analysis of the resulting microstructures regarding porosity, phase formation, phase distribution, and grain size was carried out in order to correlate them with the ensuing mechanical properties such as compressive strength at various temperatures.

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Authors and Affiliations

  1. Physical Metallurgy, IAM-WK, Karlsruhe Institute of Technology, Engelbert-Arnold-Str. 4, 76131, Karlsruhe, Germany

    C. Seemüller & M. Heilmaier

  2. Powder Technology, Fraunhofer Institute for Manufacturing Technology and Advanced Materials, Wiener Straße 12, 28359, Bremen, Germany

    T. Hartwig & M. Mulser

  3. IRC in Materials Processing, The University of Birmingham, Elms Road, Edgbaston, Birmingham, B15 2TT, UK

    N. Adkins & M. Wickins

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

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Seemüller, C., Heilmaier, M., Hartwig, T. et al. Influence of microstructure and processing on mechanical properties of advanced Nb-silicide alloys. MRS Online Proceedings Library 1516, 317–322 (2013). https://doi.org/10.1557/opl.2012.1655

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  • DOI: https://doi.org/10.1557/opl.2012.1655

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