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Two-phase PtAl2+β-(Ni,Pt)Al and single-phase β-(Ni,Pt)Al coatings were fabricated on DD5 Ni-based
superalloy and pure Ni substrates. A coating/pure Ni substrate system was studied
to determine the diffusion behaviour of Pt in the Ni–Al–Pt ternary system. The evolutions
of morphology, phases and component concentration during thermal cycles were analysed.
It was found that there is a phase shift from PtAl2 to β* in the two-phase coating, and Kirkendall porosity was observed in the single-phase
coating. Our results further indicated that there are two different diffusion paths
of Pt in the Ni–Al–Pt system.