High-throughput measurements of interdiffusivities in fcc Co-Ni-Ta alloys at 1373K and 1473K

The composition-dependent interdiffusivities in the fcc Co-Ni-Ta alloys at 1373 K and 1473 K were deduced by using our newly developed numerical inverse scheme that combines two-dimensional (2D) simulations with diffusion triple experiments. This approach largely reduced the experimental efforts by analyzing only one single-phase diffusion triple at each temperature yet covering a much wider composition range than diffusion couples. The reliability of the high-throughput results was firstly verified by reproducing the experimental 2D composition profiles in each triple. In order to further validate the deduced interdiffusivities, several traditional one-dimensional (1D) diffusion couples were also devised, and the widely recognized Sauer-Freise method and Whittle-Green method were then employed to calculate the interdiffusivities for the binaries and at the inter-section points within the ternary composition range, respectively. The interdiffusivities extracted from the in-verse scheme agree well with those from the traditional approaches, which strongly proves the applicability of the present new scheme. Besides, the constructed main interdiffusivity planes at 1373 K and 1473 K provide an overview of the diffusion behavior in the fcc Co-Ni-Ta system and promote further kinetic studies.

Automated summary

The composition-dependent interdiffusivities in the fcc Co-Ni-Ta alloys at 1373 K and 1473 K were determined using a new numerical inverse scheme combining 2D simulations with diffusion triple experiments. This approach reduced the experimental efforts by analyzing only one diffusion triple at each temperature and covering a wider composition range than diffusion couples. The deduced interdiffusivities were validated by reproducing experimental composition profiles and comparing them with traditional methods.