HYDROGEN SORPTION PECULIARITIES IN FETI-TYPE TI-FE-V-MN ALLOYS

The interaction of hydrogen with FeTi-based alloys of the Ti-Fe-V-Mn s ystem was investigated using P-C isotherms, energy dispersive X-ray an alysis (EDXA) and Auger electron spectroscopy (AES). In narrow concent ration ranges of both vanadium and manganese, the beta- and gamma-hydr ide decomposition pressure values approach each other and the correspo nding plateaux transform into one sloping plateau on the desorption is otherm. We call this phenomenon the ''pressure smoothing effect''. The alloying of FeTi with vanadium and manganese does not lead to conside rable changes in the resistance of the alloys to contamination. The pr esence of vanadium and especially manganese changes the surface proper ties and influences the activation mechanism of hydrogen absorption.