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After coating system was heat treated, the elements Ni and Al had a mutual diffusion between the coating and the substrate, while Co and Cr elements transited matrix diffusion into the coating. With the increase of heat treatment time, element concentration diffusion between the substrate and the coating is reduced.

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After coating system was heat treated, interdiffusion of elements Ni and Al between coating and substrate, as well as unidirectional diffusion of Co and Cr from matrix to coating occurred. With the increase of heat treatment time, the difference in element concentration between substrate and coating was decreased due to the unidirectional and/or bidirectional diffusion.

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