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Oxidation Behavior of a Spark Plasma Sintered Ti–48Al–2W–0.1B Alloy at 800 °C

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Abstract

Spark plasma sintering (SPS) enables the manufacturing of TiAl alloys with an exceptional combination of low density and mechanical properties such as acceptable ductility at room temperature and high strength at high temperature. However, TiAl alloys are known to exhibit low oxidation resistance above 700 °C. The oxidation of a Ti–48Al–2W–0.1B (at. %) processed by SPS was investigated at 800 °C. Coupons were oxidized in air and in Ar-21O2 (vol%), in isothermal and cyclic tests. In air, the alloy formed a mixture of Ti and Al oxides, but oxidation was slower than typically observed for W-free alloys. The oxide scale and underlying alloy were characterized by X-ray diffraction and electron microscopy in order to examine the beneficial role of W in the oxidation resistance. The main constituents of the reaction product after reaction in air may be described as follows (from gas to alloy): TiO2/porous Al2O3/TiO2 + Al2O3/TiN + Al2O3 + W/TiAl2 + W/TiAl. Close examination suggests that the relatively good oxidation resistance of the alloy is related to W doping of TiO2 in the mixed Al2O3 + TiO2 layer. The alloy formed an Al-rich oxide scale with much slower kinetics in Ar-21O2, confirming the detrimental role of N in the oxidation process.

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Acknowledgements

The authors would like to thank Claire Sanchez and Odile Lavigne (ONERA) for performing the XRD analysis and proofreading the manuscript, respectively.

Funding

This work was supported by the Direction Générale de l’Armement (DGA/Ministry of the Armed Forces).

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Authors and Affiliations

  1. DMAS, ONERA, Université Paris Saclay, 92322, Châtillon, France

    Marie-Pierre Bacos, Sylvain Ceccacci, Cécile Davoine, Thomas Gheno, Catherine Rio, Ariel Morel & Marc Thomas

  2. CEMES, CNRS UPR 8011, 29 rue Jeanne Marvig, 31055, Toulouse, France

    Jean-Philippe Monchoux

  3. LEM, UMR 104 CNRS-ONERA, Université Paris Saclay, 92322, Châtillon, France

    Jean-Sébastien Merot & Frédéric Fossard

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  1. Marie-Pierre Bacos
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  2. Sylvain Ceccacci
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Correspondence to Thomas Gheno.

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S1: Sequence of STEM-HAADF images of the TiO2 grains in the TiO2-Al2O3 layer formed on the IRIS alloy after 1000 cycles in air at 800 °C, showing intergranular W-rich particles. Supplementary file1 (AVI 6950 kb)

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Bacos, MP., Ceccacci, S., Monchoux, JP. et al. Oxidation Behavior of a Spark Plasma Sintered Ti–48Al–2W–0.1B Alloy at 800 °C. Oxid Met 93, 587–600 (2020). https://doi.org/10.1007/s11085-020-09973-8

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  • DOI: https://doi.org/10.1007/s11085-020-09973-8

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