Abstract
Isothermal oxidation behavior of NiAl, NiAl-34Cr, NiAl-28Cr-6Mo and NiAl-10Mo for up to 1000 h at 900 °C was studied. Post-mortem inspection was performed and the oxidation mechanism was analyzed. Surface coverage of the formed voids was quantitatively analyzed for the first time using image processing technique. Replacing 6 at.% Mo with Cr further enhanced the Cr effect, i.e. accelerating θ-α Al2O3 transformation, and led to a slower oxide growth rate that is comparable to NiAl. Cr(+Mo) addition resulted in a much flatter interface and less voids. The present results suggest NiAl-28Cr-6Mo exhibits the best overall oxidation resistance.
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