Title

Interdiffusion in gamma (face-centered cubic) Ni-Cr-X (X = Al, Si, Ge, or Pd) alloys at 900 degrees C

Authors

Authors

N. Garimella; M. P. Brady;Y. Sohn

Comments

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Abbreviated Journal Title

J. Phase Equilib. Diffus.

Keywords

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

Abstract

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 Title

Journal of Phase Equilibria and Diffusion

Volume

27

Issue/Number

6

Publication Date

1-1-2006

Document Type

Article; Proceedings Paper

Language

English

First Page

665

Last Page

670

WOS Identifier

WOS:000242471200016

ISSN

1547-7037

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