离子注入Y对Fe_3Al高温氧化行为的影响

Influence of Y+Implantation on High Temperature Oxidation of Fe-3Al

通过金属蒸汽真空弧离子源（简称ＭＥＶＶＡ）方法在Ｆｅ３Ａｌ表面离子注入Ｙ。在１０００℃空气中的氧化实验表明，Ｆｅ３Ａｌ经离子注入Ｙ后，初期氧化速率略有升高，但稳态氧化速率大大降低，氧化膜的塑性和粘附性大大提高，抗氧化性能明显改善。其原因在于注入的Ｙ＋在氧化过程中优先氧化，阻碍金属离子向外扩散，促进氧向内传输，改变了氧化膜的形成和生长机制。

Fe-3Al samples were implanted with doses of 5×1017 Y+/cm2 to modify the surface region. The high temperature oxidation behavior at 1000 ℃ in air was tested. The experimental results show that the implanted Fe3Al alloy has lower oxidation rate for the stationary state and better oxidation resistance than the unimplanted one, although the initial oxidation rate was increased slightly. The reason is that ion implantation improves the oxidation resistance and the scale adhesion. The change might result from that the implanted Y+ is oxidized in advance and the Y_2O_3 promotes oxygen diffusion inward scale and blocks aluminum diffusion outward.