Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Interdiffusion in the Ni-Re System: Evaluation of Uncertainties



William J. Boettinger, Maureen E. Williams, Kil-Won Moon


Diffusion couple experiments between Ni and Re at 1200°C and 1350°C were performed. These experiments established the limits of the two-phase FCC + HCP region. No intermediate phase was observed at these temperatures. Composition dependent interdiffusion coefficients and associated uncertainties were estimated by three methods. The first employed fitting of the penetration curves in conjunction with the Sauer- Freise (SF) method. The second method employed a numerical solution of the Boltzmann-Matano equation for composition-dependent interdiffusion coefficient functions whose parameters were optimized by a least squares fitting to the data. Considered independently, discrepancies between these methods indicate typical uncertainties in experimental determination of diffusion coefficients. To further assess the reasonableness of such discrepancies, uncertainties in the diffusion coefficients were estimated via a statistical analysis based on the SF method.
Journal of Phase Equilibria and Diffusion


interdiffusion, nickel-rhenium, uncertainty quantification, alloy, Sauer-Freise


Boettinger, W. , Williams, M. and Moon, K. (2017), Interdiffusion in the Ni-Re System: Evaluation of Uncertainties, Journal of Phase Equilibria and Diffusion, [online], (Accessed April 23, 2024)
Created June 23, 2017, Updated February 7, 2020