Interaction of Ті–Al–V–Fe, Al–V–Fe, and Ті–Al–Mo–Fe Powder Master Alloys with Hydrogen

Abstract

We perform the experimental investigation of the interaction of hydrogen with Ті–Al–V–Fe, Al–V–Fe, and Ті–Al–Mo–Fe master alloys used for the production of titanium alloys from powder mixtures based on hydrogenated titanium. It is shown that hydrogen released from hydrogenated titanium in the course of heating of these mixtures may temporarily saturate powder master alloys depending on their chemical composition and pressure and temperature conditions. This phenomenon leads to the appearance of bulk effects and affects the defectiveness of the crystal structure and diffusion processes responsible for the synthesis of alloys from powder mixtures. In the case of heating of the master alloys in hydrogen, we establish the temperature ranges of hydrogen sorption depending on the chemical compositions of alloys and, in the course of subsequent heating in a vacuum chamber, the temperature ranges of its desorption. The presence of titanium in the compositions of master alloys activates their interaction with hydrogen. At the same time, in the presence of significant total amount of aluminum and iron, these alloys become inert in hydrogen.