Title

Interdiffusion In Γ (Face-Centered Cubic) Ni-Cr-X (X = Al, Si, Ge, Or Pd) Alloys At 900 °C

Keywords

Boltzmann/Matano analysis; Diffusion couples; Diffusivity coefficient; Experimental study; Interdiffusion; Multicomponent diffusion; Ternary system

Abstract

Interdiffusion in nickel (Ni)-chromium (Cr) (face-centered cubic γ 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 °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 Cr 2O 3 scale. © ASM International.

Publication Date

12-1-2006

Publication Title

Journal of Phase Equilibria and Diffusion

Volume

27

Issue

6

Number of Pages

665-670

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1361/154770306X153710

Socpus ID

33845726076 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/33845726076

This document is currently not available here.

Share

COinS