Diffusivities and Atomic Mobilities in bcc Ti-Mo-Zr Alloys

Area of Science:

• Materials Science
• Metallurgy
• Biomaterials Engineering

Background:

• Beta-type (bcc structure) titanium alloys are vital for medical implants.
• Ti-Mo alloys are of significant interest as metallic biomaterials.
• Kinetic characteristics are essential for controlling phase transformation and microstructure in Ti alloys.

Purpose of the Study:

• To investigate diffusion behaviors in bcc Ti-Mo-Zr alloys.
• To develop a self-consistent atomic mobility database for the bcc phase in the Ti-Mo-Zr system.
• To validate the database using experimental diffusion data and simulations.

Main Methods:

• Diffusion couple technique was employed.
• Annealing at 1373 K for 72 h and 1473 K for 48 h.
• Composition-distance profiles analyzed using electron probe micro-analysis (EPMA).
• Whittle-Green and Hall methods used to extract diffusion coefficients.

Main Results:

• Chemical and impurity diffusion coefficients were determined.
• An atomic mobility database for the bcc Ti-Mo-Zr system was established.
• Simulations using Thermo-Calc software showed good agreement with experimental data.

Conclusions:

• The developed atomic mobility database accurately reflects diffusion behaviors in bcc Ti-Mo-Zr alloys.
• The database is suitable for predicting phase transformations and microstructure evolution.
• This work provides a reliable foundation for designing advanced titanium-based biomaterials.