OXIDATION KINETICS OF MOLYBDENUM-CONTAINING Ni_3Al-Fe BASE ALLOY IN AIR AT 900-1100℃

J Chin Soc Corr Pro

1995, Vol. 15

Issue (2): 100-104 DOI:

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OXIDATION KINETICS OF MOLYBDENUM-CONTAINING Ni_3Al-Fe BASE ALLOY IN AIR AT 900-1100℃

Ye Changjiang; Li Tiefan; Guo Jianting; Shen Jianian(Corrosion Science Laboratory; Institute of Corrosion and Protection of Metals;Chinese Academy of Sciences)

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Abstract 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.

Key words: Ni_3Al-Fe base alloy γ phase βphase oxidation resistance

Received: 25 April 1995

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Ye Changjiang; Li Tiefan; Guo Jianting; Shen Jianian(Corrosion Science Laboratory; Institute of Corrosion and Protection of Metals;Chinese Academy of Sciences). OXIDATION KINETICS OF MOLYBDENUM-CONTAINING Ni_3Al-Fe BASE ALLOY IN AIR AT 900-1100℃. J Chin Soc Corr Pro, 1995, 15(2): 100-104.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1995/V15/I2/100

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