AN INVESTIGATION ON INITIAL OXIDATION RATE OF Ni_3Al ALLOY

J Chin Soc Corr Pro

1996, Vol. 16

Issue (3): 201-205 DOI:

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AN INVESTIGATION ON INITIAL OXIDATION RATE OF Ni_3Al ALLOY

LI Tiefan; YE Changjiang (Cormsion Science Lab.; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences)(Physics Dept. of Jinan University)

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Abstract The initial oxidation behavior of Ni3Al and Ni3Al-Cr alloys at a temperature range of 700-1100℃ was investigated using Setaram thermal anaysis instrument with sensitivity of 2 ug. At 700-900℃, the oxidation of Ni3Al in the first 5 minutes was accelerated markedly with increasing temperature. The weight gains of Ni3Al after xoidation for 0.5h at 800℃ and 900℃ was lower than that at 700℃. Addition of chromium into Ni3Al significantly reduced the oxidation rate of the alloy below 900℃, but increased its oxidation rate above 1000℃. The oxide scale was examined by EDS. The results indicated that no plain NiO phase region was observed on the oxide scale of Ni3Al-Cr alloy. Cr addition might decrease the lattice parameters of Ni3Al, increase the packing density and reject the surface diffusion of Ni.

Key words: NisAl-based alloy Oxidation Oxidation kinetics

Received: 25 June 1996

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LI Tiefan; YE Changjiang (Cormsion Science Lab.; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences)(Physics Dept. of Jinan University). AN INVESTIGATION ON INITIAL OXIDATION RATE OF Ni_3Al ALLOY. J Chin Soc Corr Pro, 1996, 16(3): 201-205.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1996/V16/I3/201

1LiuCT,WhiteCL．ActaMetall．,1987,35:6432LiuCT．HighTemperatureOrderedIntermetatlicAlloysII,MRS,Pitlsburgh,PA88;1987．p．3553PettitFS．Thans．Metall．Soc．AIME;1967,239:12964PanYC,ChuangTH,YaoYD．JMatSci．,1991,26:60975孙超,郭建亭,李辉,管恒荣．中国腐蚀与防护学报,1990,10:1716HortonJA,CathcartJV;LiuCTOxid．Met．,198829:3477ShindoD,KikuchiM．Thans．JapanInst．Metals,1988;29:9568刘国勋主编．金属学原理．北京:冶金工业出版社,1987．280

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