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Cyclic oxidation of β-NiAl alloys doped with different reactive elements (REs) each of which had an optimized concentration was investigated. All of REs effectively suppressed growth of voids beneath oxide scales formed on the alloys. The La-doped alloy suffered from severe internal oxidation. The Hf or Zr-doped alloys exhibited lower oxidation rate, while the Dy-doped alloy showed less scale rumpling...
Cr/Dy doped β-NiAl coatings were produced by electron beam physical vapour deposition (EB-PVD). Cyclic oxidation and hot-corrosion behaviour of the coatings was investigated. The addition of 0.1 at.% Dy to the β-NiAl coating significantly improved the cyclic oxidation resistance, while the addition of 1.3 at.% Cr to the NiAlDy accelerated the scale spallation. Spinels containing Mg, Na and Ca and...
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