Hydrogen Diffusion Influence on the Stabilizing Phases Behavior in the Ti-6Al-4V Alloy

Abstract:

For obtaining a unique microstructure in Ti-6Al-4V, hydrogen is utilized as a temporary alloying element; therefore, the mechanism of hydrogen diffusion in α and β phases should be understood. In this study, the electrochemical hydrogenation was applied to the half-length of thin titanium rods, and the diffusion annealing heat treatment was implemented at different temperatures. The hydrogen diffusion coefficient of α phase (D_α) and the hydrogen diffusion coefficient of β phase (D_β) was determined by employing Abaqus software and C^# program for three different homogeneous microstructures. The obtained results showed that D_β increases, and D_α decreases when the hydrogen concentration in β phase increases. Furthermore, it was observed that each microstructure has a specific temperature in which the maximum hydrogen amount is absorbed. The hydrogen uptake depends more on the volume fraction of β phase than the volume fraction of α phase, which is considered an obstacle to hydrogen diffusion in this alloy.

• Periodical: Key Engineering Materials (Volume 904)
• Pages: 103-110
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.904.103
• Online since: November 2021
• Authors: Mohammed Kasim Mohsun*
• Keywords: Diffusion Coefficient Determination, Hydrogen Diffusion Behavior, Ti-6Al-4V

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