Optimization of composition and heat treatment of age-hardened Pt−Al−Cr−Ni alloys |
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| Authors: | M Hüller M Wenderoth S Vorberg B Fischer U Glatzel R Völkl |
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| Affiliation: | (1) Corporate Research Centre Germany, EADS Deutschland GmbH, D-81663 Munich, Germany;(2) Metallic Materials, University Bayreuth, Bayreuth, Germany;(3) University of Applied Sciences Jena, FB WT, D-07745 Jena, Germany |
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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 are 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 L12 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 verity the crystal
structure.
M. Huller, formerly with Metallic Materials, University Bayreuth, D-95440 Bayreuth, Germany |
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