Journal Article

Square Root Diffusivity Analysis of Body-Diagonal Diffusion Couples in FeNiCoCr Quaternary and FeNiCoCrMn Quinary Systems

Kulkarni, Kaustubh N., Verma, Vivek

2022

Overview

Data on interdiffusion coefficients in quaternary and higher order systems have been almost absent in the literature due to the scarcity in proper experimental techniques. In the present work, interdiffusion coefficients are reported at 1000 °C in FeNiCoCr and FeNiCoCrMn systems using square root diffusivity analysis of the diffusion couples prepared based on body diagonal diffusion couple approach. Strong diffusional interactions have been manifested in terms of the large values of the cross interdiffusion coefficients compared with the respective main interdiffusion coefficients. D ~ NiCo Cr and D ~ CoNi Cr were both found to be positive and, 54.5-66.7% and 30-50% of the respective main coefficients in the case of quaternary Fe-Ni-Co-Cr system. D ~ FeNi Cr and D ~ FeCo Cr were found to be positive and, 74.5-85.2% and 50.9-59% of the main coefficient D ~ FeFe Cr whereas D ~ NiMn Cr was found to be negative and 57.5-63.6% of the main coefficient D ~ NiNi Cr in magnitude in the case of quinary Fe-Ni-Co-Cr-Mn system. Errors associated with the interdiffusivities determined using the square root diffusivity approach are higher in comparison to the Kirkaldy’s method for quaternary system. However, the trend is reversed for the quinary system. Successful application of the square root diffusivity technique to the body-diagonal diffusion couples prepared in these systems indicate that the interdiffusion coefficients are constant over a large composition range in the two studied systems.

• Publisher: Springer US,Springer Nature B.V
• Subject: Ceramics / Chromium / Cobalt / Coefficients / Composites / Crystallography and Scattering Methods / Diffusion / Diffusivity / Engineering Thermodynamics / Glass / Heat and Mass Transfer / Interdiffusion / Iron / Manganese / Metallic Materials / Natural Materials / Nickel / Physics / Physics and Astronomy / Quaternary systems / Quinary systems / Thermodynamics