%0 Journal Article
%A Galiullin, T.
%A Chyrkin, A.
%A Pillai, R.
%A Vassen, R.
%A Quadakkers, W. J.
%T Effect of alloying elements in Ni-base substrate material on interdiffusion processes in MCrAlY-coated systems
%J Surface and coatings technology
%V 350
%@ 0257-8972
%C Amsterdam [u.a.]
%I Elsevier Science
%M FZJ-2018-04902
%P 359 - 368
%D 2018
%X The effect of alloying elements in the substrate on the interdiffusion processes between a NiCoCrAlY-coating and model Ni-base superalloys was studied. Four single-crystal substrates Ni-10Cr-8Al-X (wt%, X = 10Co, 9Ta, 6 W) were coated with a conventional NiCoCrAlY-coating and exposed to air for up to 1000 h at 1050 °C. The microstructural analyses (LOM/SEM/EDX) revealed a strong dependence of the coating degradation rate on the substrate composition. The coating applied to the ternary base Ni-10Cr-8Al alloy and to the quaternary Co-containing substrate degraded most rapidly while the Ta addition to the substrate effectively suppressed interdiffusion. The degradation phenomena such as β-NiAl depletion and propagation of the secondary reaction zone (SRZ) were interpreted in terms of a thermodynamical analysis in Thermo-Calc and by using a CALPHAD-based thermodynamic-kinetic diffusion model.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000444660500034
%R 10.1016/j.surfcoat.2018.07.020
%U https://juser.fz-juelich.de/record/851202