Abstract
A chromized layer was prepared on the alloy surface of TiAl intermetallics through using double-glow plasma alloying. The surface morphology, microstructure, and phase composition of the chromized layer before and after oxidation were observed by scanning electron microscopy, energy-dispersive spectroscopy, and x-ray diffraction. The cyclic oxidation behavior of the chromized layer at 850 °C was analyzed. Results demonstrated that the chromized layer had uniform and dense tissues and formed gradient metallurgical bonding with the substrate. The chromized layer further showed strong resistance to high-temperature oxidation in early-stage oxidation. However, the mixed oxides Cr2O3, Al2O3, and TiO2 were produced on the oxidation film–chromized layer interface during the long-term oxidation process. Given the poor adhesive strength of mixed oxides, the oxidation film underwent local peeling, which was attributed to the high Cr content of the chromized layer. However, the oxidation film in the peeled-off region healed automatically. Therefore, the chromized layer presented strong long-term resistance to high-temperature oxidation.
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