Abstract
Ion implantation was applied to a gamma TiAl alloy, and the oxidation behavior of the alloy implanted with B, P, Fe, or W was investigated through a cyclic oxidation test at 1200 K in a flow of purified oxygen under atmospheric pressure. Metallographic examinations were performed for the implanted specimens and the oxidized specimens using X-ray diffractometry (XRD), Auger electron spectroscopy (AES), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA). The β phase was detected along with γ-TiAl in the Fe- or W-implanted specimens, while γ-TiAl was the predominant phase for the B- or P-implanted specimens. The implantation of P, Fe, or W significantly improved the oxidation resistance, provided the ion dose was sufficient, whereas the implantation of B enhanced scale spallation, resulting in deteriorated oxidation resistance. The AES profiles for the specimens oxidized for a very short period strongly suggested the incorporation of P or W in TiO2. The possible mechanisms for the improvement are discussed on the basis of the results obtained for the implanted alloys.
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