Abstract
Residual stresses in the scales of water-quenched and air-cooled Pt84:Al11:Cr3:Ru2 (at.%) specimens oxidized in air at 1150°C for up to 100h were measured using luminescence piezospectroscopy. Scanning electron microscopy equipped with energy dispersive spectroscopy, optical microscopy, X-ray diffraction and Raman spectroscopy showed that well-adhering, irregular and protective external α-Al2O3 scales developed on all specimens. Room-temperature residual stresses were compressive and became independent of oxidation times above 10h exposure. Stress measurement results suggest that the air-cooled specimens possessed better adhesion than the water-quenched specimens, while both displayed lower stress values than those of the Ni- and Fe-based superalloys.
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