|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Materials Processing Fundamentals
||Time Variation of Concentration-dependent Interdiffusion Coefficient
||Osamudiamen Olaye, Olanrewaju Akanbi Ojo
|On-Site Speaker (Planned)
The long-held assumption that the concentration dependence of interdiffusion coefficient (D(C)) is an isothermal constant that does not change with time is investigated theoretically and experimentally. Theoretically, D(C) is evaluated from concentration profiles obtained numerically at different times under the influence of diffusion-induced stress. Experimentally, a new numerical model and the forward simulation technique are used to extract D(C) from several experimental profiles at several diffusion times. Although not commonly acknowledged, the results of the theoretical and experimental investigations show that even in binary systems, under isothermal conditions, D(C) can significantly change with time. Furthermore, trivializing this concept can lead to a notable misinterpretation of experimental data, including a consequential misidentification of the mechanism of microstructural changes by phase transformation reactions.
||Phase Transformations, Copper / Nickel / Cobalt, Modeling and Simulation