Tensile properties of a series of V-4Ti-4Cr alloys containing small amounts of Si, Al and Y, and the influence of helium implantation

V-Ti-Cr type alloys containing Si, Al and Y have been developed to improve proof-oxidation properties and high temperature strength. In order to optimize the composition of Si, Al and Y, seven V-Ti-Cr type alloys containing Si, Al and Y up to 0.5 wt% were prepared. Tensile tests were carried out at temperatures from 300 to 1123 K. From the results of the tests, the dependence of yield stress and ultimate tensile strength on Si, Al and Y concentration is low at these temperatures. Total elongation of the alloys tested at 923 and 1123 K increase with increasing concentration of Si, Al and Y. Helium implantation up to about 50 appm by an accelerator was also carried out. The loss of total elongation at 923 and 1123 K depends on the concentration of Si, Al and Y. From the results of helium implantation, it is suggested that the appropriate concentration of Si, Al and Y for V-4Ti-4Cr alloys is between 0.1 and 0.5 wt%, respectively.