Calculation Of Interdiffusion Coefficients Of Ni And Alatoms In Β--Nial Phase As Aluminide Coatings

Acta Metall Sin

2004, Vol. 40

Issue (1): 51-56 DOI:

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Calculation Of Interdiffusion Coefficients Of Ni And Alatoms In Β--Nial Phase As Aluminide Coatings

WEI Hua; SUN Xiaofeng; ZHENG Qi

Institute of Metal Research; The Chinese Academy of Sciences

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WEI Hua; SUN Xiaofeng; ZHENG Qi. Calculation Of Interdiffusion Coefficients Of Ni And Alatoms In Β--Nial Phase As Aluminide Coatings. Acta Metall Sin, 2004, 40(1): 51-56 .

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Abstract The modified Wagner's equation is deduced based on some assumptions and analysis of the Al content profiles in aluminide coatings formed on K465 alloy and pure Ni at 850℃, 950 ℃ and 1050 ℃ for 5 h, respectively. The complicated composition and microstrurcture of K465 alloy are taken into account when deducing the modified Wagner's equation, by which the interdiffusion coefficients are calculated as functions of Al content in β--NiAl phase as aluminide coatings. Calculated results show that the interdiffusion coefficients in β--NiAl phase formed on K465 alloy are evidently less than those on pure Ni, and the interdiffusion coefficients in β--NiAl phase formed on K465 alloy strongly depends on Al content. Effects of alloying elements and precipitates on the interdiffusion coefficients in β--NiAl phase formed on K465 alloy are briefly discussed.

Key words: aluminide coating pack cementation

Received: 30 December 2002

ZTFLH:

TG174.451

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	WEI Hua
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	ZHENG Qi

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2004/V40/I1/51

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