Diffusivities and Atomic Mobilities in BCC Ti-Fe-Cr Alloys.

Area of Science:

• Materials Science
• Physical Metallurgy
• Thermodynamics

Background:

• Understanding diffusion in ternary alloys is crucial for materials development.
• The Ti-Fe-Cr system is relevant for various high-temperature applications.
• Accurate diffusion data is essential for thermodynamic modeling.

Purpose of the Study:

• To investigate diffusion behavior in the Ti-Fe-Cr ternary system.
• To determine ternary inter-diffusion and impurity diffusion coefficients.
• To establish a self-consistent database for atomic mobility.

Main Methods:

• Diffusion couple technique at 1273 K and 1373 K.
• Whittle-Green and Hall methods for coefficient determination.
• CALPHAD (Calculation of Phase Diagrams) method for database development.

Main Results:

• Diffusion coefficients (D˜FeFeTi, D˜CrCrTi) were quantified at both temperatures.
• A self-consistent atomic mobility database for the body-centered cubic (bcc) phase was established.
• Simulations showed good agreement with experimental data (error < 15%).

Conclusions:

• The developed database accurately reflects experimental diffusion characteristics.
• The established database is reliable for diffusion simulations in the Ti-Fe-Cr system.
• This research provides valuable data for thermodynamic and kinetic modeling.