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Diffusion in the Ti-Al-V system is studied and a CALculation of Phase Diagrams (CALPHAD) diffusion mobility description is developed. Diffusion couple experiments are performed to obtain diffusion paths in the hcp phase at 923 K, 1023 K and 1123 K. The diffusion coefficient of V in the hcp-Ti phase is found to decrease with increasing Al alloying. A forward-simulation analysis is used to evaluate the impurity diffusion coefficient for Al and V diffusion in the hcp Ti-V and the Ti-Al systems which are used as input in the mobility modeling. The composition dependency for the diffusion in the hcp phase in the ternary system is accounted for and a CALPHAD diffusion mobility description is obtained by directly optimizing the mobility parameters as a function of the experimental composition profiles from the diffusion couples. Both experimental data and previous diffusion mobility descriptions in the literature for the bcc Ti-Al-V phase are adopted. A complete description of diffusion in both the hcp and bcc phases for the Ti-Al-V system is presented with the aim to be used for design of Ti alloys and processes. Keywords CALPHAD Á diffusion couples Á diffusion modeling Á interdiffusion Á Ti-Al-V This invited article is part of a special issue of the Journal of Phase Equilibria and Diffusion in honor of Prof. Zhanpeng Jin's 80th birthday. The special issue was organized by Prof. Ji-Cheng (JC) Zhao,

pydiffusion is a free and open-source Python library designed to solve diffusion problems for both singlephase and multi-phase binary systems. The key features of pydiffusion include fast simulation of multiphase diffusion and extraction of diffusion coefficients from experimental concentration profiles using forward simulation analysis. pydiffusion also provides various mathematical models for diffusion profile smoothing, diffusion coefficient evaluation, and data optimization. In pydiffusion, diffusion profiles and various phases are easy to define or read from the experimental datasets. Visualization tools based on Matplotlib are also provided to help users present or refine their simulations and analysis.

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