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用高温原位Ｘ射线衍射技术分析研究了Ｔｉ３Ａｌ基合金在７００℃和８００℃的氧化行为，测定了其１００ｈ的氧化增重曲线，并用电子探针分析了氧化层截面的元素分布。实验结果表明，Ｔｉ３Ａｌ氧化过程中先形成ＴｉＯ２，氧化层组成为ＴｉＯ２与Ａｌ２Ｏ３的混合物。Ｎｂ、Ｓｉ元素可提高Ｔｉ３Ａｌ合金的抗氧化性能，促使合金表面形成ＴｉＮ与ＴｉＡｌ层，但对Ａｌ２Ｏ３的生成没有促进作用。形成ＴｉＮ层是Ｔｉ３Ａｌ合金抗氧化性能提高的主要原因。
The oxidation behavior of Ti3Al-based alloy at 700 ℃ and 800 ℃ was analyzed by in-situ X-ray diffraction. The oxidation-weight gain curve of Ti3Al-based alloy was measured and the elemental distribution of the oxide layer was analyzed by electron probe. The experimental results show that during the oxidation of Ti3Al, TiO2 is first formed and the oxide layer is composed of a mixture of TiO2 and Al2O3. Nb and Si can improve the oxidation resistance of Ti3Al alloy, and promote the formation of TiN and TiAl layers on the alloy surface, but did not promote the formation of Al2O3. The formation of TiN layer Ti3Al alloy is the main reason for improving the oxidation resistance.