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Optimization of composition and heat treatment of age-hardened Pt-Al-Cr-Ni alloys

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Abstract

The objective of this work was to produce an alloy showing a microstructure similar to Ni-base superalloys, but with Pt as base metal. The Pt-base alloys with various contents of Al, Cr, and Ni were arc melted. Solution heat treatments at 1450 °C followed by water quenching lead to single-phase alloys. Ageing at 1000 °C resulted in the precipitation of Ll2 ordered particles. An alloy with 11 at. pct Al, 3 at. pct Cr, 6 at. pct Ni, and Pt balance shows cuboidal precipitates with edge lengths of 200 to 500 nm along with a volume fraction of 23 pct and a lattice misfit of −0.1 pct. Aging at 1100 °C leads to coarsening of precipitates. Volume fraction and morphology of the precipitates were investigated by scanning electron microscopy and optical microscopy. X-ray diffraction as well as transmission electron microscopy (TEM) were applied to verify the crystal structure.

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Author notes

  1. M. Hüller (Metallic Materials, Doctoral Student)

    Present address: University Bayreuth, D-95440, Bayreuth, Germany

Authors and Affiliations

  1. Corporate Research Centre Germany, EADS Deutschland GmbH, D-81663, Munich, Germany

    M. Hüller (Metallic Materials, Doctoral Student)

  2. Metallic Materials, University Bayreuth, Germany

    M. Wenderoth (Doctoral Student), U. Glatzel (Professor) & R. Völkl (Senior Researcher)

  3. the University of Applied Sciences Jena, FB WT, D-07745, Jena, Germany

    S. Vorberg (Doctoral Student) & B. Fischer (Professor)

Authors
  1. M. Hüller
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  2. M. Wenderoth
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  3. U. Glatzel
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  5. S. Vorberg
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  6. B. Fischer
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Hüller, M., Wenderoth, M., Glatzel, U. et al. Optimization of composition and heat treatment of age-hardened Pt-Al-Cr-Ni alloys. Metall Mater Trans A 36, 681–689 (2005). https://doi.org/10.1007/s11661-005-0184-2

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  • DOI: https://doi.org/10.1007/s11661-005-0184-2

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