HIGH-TEMPERATURE DEFORMATION OF MODIFIED V-TI-CR-SI TYPE ALLOYS

Modified V-Ti-Cr-Si type alloys containing Al and Y were prepared in order to improve the oxidation resistance for fusion reactor applications. The fabrication procedure and the condition of heat treatment were determined for two alloys referred as V-5Ti-5Cr- and V-25Ti-15Cr-. Mechanical properties were measured using miniature-type tensile specimens at temperatures from 300 to 1273 K. The alloy V-5Ti-5Cr- showed the same level of strength and ductility as a reference alloy of V-15Cr-5Ti and the alloy V-25Ti-15Cr- was twice as strong as the reference alloy at temperatures from 300 to 873 K. Dynamic strain aging and work softening phenomena with large elongation were observed at intermediate and high temperature regions, respectively.