Title

Interdiffusion Analysis For Nial Versus Superalloys Diffusion Couples

Keywords

Coatings; Diffusion coefficients; Interdiffusion; Multi-component; Multiphase; Superalloys

Abstract

Solid-to-solid diffusion couples, β-NiAl (B2) versus various commercial superalloys (i.e., CM247, GTD-111, IN-939, IN-718, and Waspalloy) were examined to quantify the rate of Al interdiffusion as a function of initial superalloy composition. The diffusion couples were assembled with Invar steel jig encapsulated in Ar by sealing in quartz capsules and annealed at 1050°C for 96 h. Concentration profiles measured by electron probe microanalysis in the single-phase β-NiAl region were used to determine interdiffusion fluxes and effective interdiffusion coefficients of individual components in the single-phase β-NiAl side of the couple. The values determined using experimental concentration profiles of the single-phase β-NiAl side of the couple were used to predict effective interdiffusion coefficients in multiphase superalloy side of the couple based on mass balance and local continuity of interdiffusion fluxes. Microstructural and compositional stability of protective coatings (e.g., NiCoCrAlY and NiAl) as a function of superalloys composition are discussed based on effective interdiffusion coefficients predicted from diffusion couple studies. © ASM International.

Publication Date

12-1-2006

Publication Title

Journal of Phase Equilibria and Diffusion

Volume

27

Issue

6

Number of Pages

659-664

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1361/154770306X153701

Socpus ID

33845790545 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/33845790545

This document is currently not available here.

Share

COinS