Effect of platinum addition on oxidation behaviour of γ/γ′ nickel aluminide

Y. Chen, X. Zhao, Mingwen Bai, A. Chandio, R. Wu, P. Xiao

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43 Citations (Scopus)


Bulk γ/γ′ nickel aluminide alloys of composition (in at.%) Ni–20Al with the addition of 0, 5, 10 and 15Pt were fabricated using arc melting, and the microstructure of the alloys was characterized. The oxidation behaviours of the alloys at 1150 °C were studied and compared in terms of oxide spallation, oxide microstructure and growth, residual stress in the α-Al2O3 scale and oxide/alloy interface morphology. Progressively increased platinum addition into the alloys results in (1) improvement in the resistance to oxide spallation, (2) reduction in oxidation of nickel, (3) lower stresses in the α-Al2O3 scale and (4) more planar oxide/alloy interfaces. In addition, for short-time oxidation (⩽1 h), the stresses in the α-Al2O3 scale on the γ′ phase region of the alloy are lower than those on the γ/γ′ mixed phase region. Discussion on the platinum effect has been focused on selective oxidation of the alloy and stress development in the oxide scale. It is concluded that the selective oxidation of aluminium promoted by platinum plays a crucial role in the evolution of the oxidation behaviour with the platinum addition.
Original languageEnglish
Pages (from-to)319-330
Number of pages12
JournalActa Materialia
Early online date13 Jan 2015
Publication statusPublished - 2015
Externally publishedYes


  • Platinum
  • Nickel aluminide
  • Oxidation
  • Stress
  • Interface


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