研究了含Ｍｏ的Ｎｉ３Ａｌ－Ｆｅ基合金在９００－１１００℃空气中的等温氧化行为，利用光学显微镜、ＳＥＭ、ＥＰＭＡ、ＸＲＤ分析了氧化膜的形态和结构．研究表明，含Ｍｏ的Ｎｉ３Ａｌ－Ｆｅ基合金由γ和β相组成．对应于γ相的氧化膜由多相组成，合金元素Ｆｅ和Ｍｏ使得γ相的氧化速率增大，氧化膜的粘附性和内聚力下降，其氧化反应激活能为４２．７ｋＪ／ｍｏｌ，Ｆｅ穿过Ａｌ２Ｏ３氧化层的扩散为氧化反应的速率控制步骤．而β相中的Ｆｅ和Ｍｏ，对其抗氧化性无不利影响，氧化膜仅由Ａｌ２Ｏ３．
The isothermal oxidation behavior of molybdenum-containing Ni3Al-Fe base alloy was studied at 900-1100℃ in air. The structure and composition of the oxide scale were investigated by X-ray diffraction,scanning electron microscopy and electron microprobe analyzer etc. The reaction energy of oxidation wascalculated as 42.7kJ/mol. The microstructure of the alloy is composed of γ and β phases. The scale onγ phase was composed of several oxide layers, revealing crystallographic voids. Mo and Fe in γ phaseincreased the oxidation rate of Ni3Al and reduced the adhesion and cohesion of the oxide scale. It is shownthat the oxidation of γ phase followed a parabolic rate law, and unlike other Ni3Al alloy, its oxidationwas controlled by the diffusion of Fe in the oxide layer of Al2O3. The scale on β phase was composed of acontinuous, compact Al2O3 oxide layer, and Mo and Fe in the β phase is harmless to oxidation of β-NiAl.
参考文献
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