Interdiffusion in gamma (face-centered cubic) Ni-Cr-X (X = Al, Si, Ge, or Pd) alloys at 900 degrees C
Abbreviated Journal Title
J. Phase Equilib. Diffus.
Boltzmann/Matano analysis; diffusion couples; diffusivity coefficient; experimental study; interdiffusion; multicomponent diffusion; ternary; system; TEMPERATURE CORROSION PROCESSES; OXIDATION BEHAVIOR; DIFFUSION COUPLES; STAINLESS-STEEL; BASE ALLOYS; COEFFICIENTS; MECHANISMS; ELEMENTS; SILICON; SCALES; Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy &; Metallurgical Engineering
Interdiffusion in nickel (Ni)-chromium (Cr) (face-centered cubic gamma phase) alloys with small additions of aluminum (Al), silicon (Si), germanium (Ge), or palladium (Pd) was investigated using solid-to-solid diffusion couples. Ni-Cr-X alloys having compositions of Ni-22at.%Cr, Ni-21at.%Cr-6.2at.%Al, Ni-22at.%Cr-4.0at.%Si, Ni-22at.%Cr-1.6at.%Ge, and Ni-22at.%Cr-1.6at. % Pd were manufactured by arc casting. The diffusion couples were assembled in an Invar steel jig, encapsulated in Ar after several hydrogen purges, and annealed at 900 degrees C in a three-zone tube furnace for 168 h. Experimental concentration profiles were determined from polished cross sections of these couples by using electron probe microanalysis with pure element standards. Interdiffusion fluxes of individual components were calculated directly from the experimental concentration profiles, and the moments of interdiffusion fluxes were examined to determine the average ternary interdiffusion coefficients. The effects of ternary alloying additions on the diffusional behavior of Ni-Cr-X alloys are presented in the light of the diffusional interactions and the formation of a protective Cr2O3 scale.
Journal of Phase Equilibria and Diffusion
Article; Proceedings Paper
"Interdiffusion in gamma (face-centered cubic) Ni-Cr-X (X = Al, Si, Ge, or Pd) alloys at 900 degrees C" (2006). Faculty Bibliography 2000s. 6152.