|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||High Entropy Alloys V
||Experimental Demonstration of Isotope-free Simultaneous Measurement of Self- and Inter-diffusion Coefficients
||Esin Schulz, Irina V. Belova, Graeme E. Murch, Yongho Sohn
|On-Site Speaker (Planned)
Experimental determination of a tracer or self-diffusion coefﬁcient in alloys can be burdensome due to the use of isotopes and the number of experiments required to assess composition- and temperature-dependence. A new formalism recently developed by Belova et al., based on linear response theory combined with the Boltzmann–Matano method allows determination of tracer and interdiffusion coefﬁcients simultaneously from a single, isotope-free sandwich-type diffusion experiment. In this study, experimental demonstration of this new formalism is carried out in the Cu-Ni system. Thin film of pure Cu was deposited on a selected alloy (e.g., Cu-50Ni), sandwiched between two other alloys (e.g., Cu-75Ni), and annealed isothermally at 900 and 1000°C. SEM/XEDS was employed to examine the interdiffusion zone and determine concentration profiles. The self- and inter-diffusion coefficients simultaneously determined using the experimental methodology based on the new formalism produced results consistent with previously reported values determined independently by radiotracer and interdiffusion experiments.
||Planned: Supplemental Proceedings volume