通过纯Ni和K465合金表面渗Al涂层中Al原子浓度分布曲线的分析, 考虑到K465合金复杂的化学成分和显微组织, 基于一定的假设, 推导出Wagner修正式,并分别计算了850, 950和1β050℃纯Ni和K465合金表面渗Al涂层中β--NiAl相Ni, Al互扩散系数.计算结果表明:K465合金表面渗Al层中β--NiAl相Ni, Al互扩散系数明显小于纯Ni表面渗Al涂层中β--NiAl 相Ni, Al互扩散系数；与化学计量比β--NiAl相相似, K465合金表面渗Al中β--NiAl相Ni, Al互扩散系数与Al原子浓度有很大的相关性.简要分析了合金元素和析出相对渗Al涂层中β--NiAl相Al, Ni互扩散系数的影响.
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.
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