Diffusion and other kinetic data in support of JPED publications https://hdl.handle.net/11256/925 2026-04-18T10:09:35Z 2026-04-18T10:09:35Z Boettinger, William J Williams, Maureen E Moon, Kil-Won McFadden, Geoffrey B Patrone, Paul N Perepezko, John H https://hdl.handle.net/11256/944 2017-06-22T18:38:19Z 2017-06-22T00:00:00Z

Interdiffusion in the Ni-Re System: Evaluation of Uncertainties Boettinger, William J; Williams, Maureen E; Moon, Kil-Won; McFadden, Geoffrey B; Patrone, Paul N; Perepezko, John H Diffusion couple experiments between Ni and Re at 1200 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 ordinary differential equation for composition-dependent interdiffusion coefficient functions whose parameters were optimized by a least squares fitting to the data. Discrepancies between the results of these methods indicate typical uncertainties in experimental determination of diffusion coefficients. To further assess such discrepancies, a third method was employed to pe form an uncertainty quantification of the diffusion coefficients via a statistical analysis based on the SF method.

2017-06-22T00:00:00Z Moon, Kil-Won Campbell, Carelyn Williams, Maureen Boettinger, William https://hdl.handle.net/11256/700 2023-01-31T18:52:42Z 2016-04-01T00:00:00Z

Co-Al-W Diffusion Mobilities Moon, Kil-Won; Campbell, Carelyn; Williams, Maureen; Boettinger, William Diffusion couple experiments between various Co-rich face centered cubic (FCC) alloys in the Co-W-Al ternary system have been conducted at 900 °C and 1000 °C. Diffusion coefficients have been extracted for the Co-W binary and for ternary alloys at compositions where the diffusion paths cross. In addition, a least squares method has been utilized to optimize diffusion mobility parameters using DICTRA simulations to best fit the experimental concentration vs. distance curves. Predictions of the diffusion matrix using the refined mobility database are in good agreement with the values obtained at the diffusion path crossing points.

2016-04-01T00:00:00Z Campbell, Carelyn E. Zhao, J-C. Henry, M. F. https://hdl.handle.net/11115/118 2015-09-23T04:08:07Z 2013-05-05T00:00:00Z

Al-Co, Co-Fe Diffusion Mobilities, Ni/Rene88, IN718/Rene88 Campbell, Carelyn E.; Zhao, J-C.; Henry, M. F. A multicomponent diffusion mobility database for the Ni-rich fcc phase [2002Cam] is evaluated by comparing diffusion simulations to two experimental multicomponent Ni-base superalloy diffusion couples: Ni/Rene´-88 and IN718/Rene´-88. The diffusion simulations use composition dependent thermodynamic and diffusion quantities within a finite difference code to simulate single-phase and multiphase planar layers. The multiphase layers consist of a matrix phase and a disperse phase. The calculated composition profiles, interdiffusion coefficients, phase fraction profiles, and location of Kirkendall porosity are compared with experimental results. To treat diffusion in the IN718 alloy, iron and carbon are added to the existing diffusion mobility database using previous assessment work and new assessments of Fe-Al and Fe-Co.

2013-05-05T00:00:00Z