The isothermal oxidation behaviour of Ti–44Al–4Nb–4Mn–1B, Ti–44Al–4Nb–4Zr–1B and Ti–44Al–8Nb–1B alloys has been studied in Air-H₂O environment under atmospheric pressure. The presence of H₂O leaded to a significant increase in the oxidation kinetics of TiAl-based alloys and changed the crystal morphology and structure of the oxide scales. Moreover, Air-H₂O environment strengthened the anisotropy of defects in the oxides, resulting in the directional growth of TiO₂. In addition, the difference of the added elements (Mn, Zr, Nb) leaded to different oxidation behaviors of TiAl-based alloys in the Air-H₂O environment, which was obviously different from the influence of these elements in the air or oxygen environment. In particular, the high Nb content not only did not improve the oxidation resistance of the TiAl alloy, but also caused serious internal oxidation at the oxide scale-substrate interface in Air-H₂O environment.

在大气压力下，在空气-H ₂ O环境中研究了Ti–44Al–4Nb–4Mn–1B，Ti–44Al–4Nb–4Zr–1B和Ti–44Al–8Nb–1B合金的等温氧化行为。H ₂ O的存在导致TiAl基合金的氧化动力学显着增加，并改变了氧化皮的晶体形态和结构。此外，空气-H ₂ O环境增强了氧化物中缺陷的各向异性，从而导致TiO ₂的定向生长。另外，添加元素（Mn，Zr，Nb）的差异导致Ti-Al基合金在空气-H ₂中的氧化行为不同。O环境，这明显不同于这些元素在空气或氧气环境中的影响。尤其是，高的Nb含量不仅不能提高TiAl合金的抗氧化性，而且还会在Air-H ₂ O环境中在氧化皮-基底界面处引起严重的内部氧化。