根据铝化物涂层形成过程中Al原子浓度分布，采用有限差分法反求铝化物外层Ni/Al互扩散系数。结果表明：相同温度下，铝化物外层Ni/Al互扩散系数随Al原子浓度增加而增大，表现出与Al浓度相关性；合金表面渗铝外层Ni/Al互扩散系数明显小于纯Ni表面渗铝外层Ni/Al互扩散系数。
A numerical method has been developed to extract the composition-dependent interdiffusivity of Ni and Al from the concentration profiles in the aluminide coatings prepared by pack cementation. The procedure is based on the classic finite difference method(FDM). In order to simplify the model, the effect of some alloying elements and carbides on interdiffusivity was negligible. Calculated results indicated that interdiffusivities of Ni and Al in aluminide coating on K465 superalloy strongly depended on the composition and were evidently less than those on pure nickel substrate. The reasons for decreasing of interdiffusivities in aluminide coatings on K465 superalloy were briefly discussed.
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