STP484: Irradiation Effects at Cryogenic Temperature on Tensile Properties of Titanium and Titanium-Base Alloys

    Younger, CL
    Nuclear engineers, Lewis Research Center, National Aeronautics and Space Administration, Cleveland, Ohio

    Haley, FA
    Nuclear engineers, Lewis Research Center, National Aeronautics and Space Administration, Cleveland, Ohio

    Pages: 27    Published: Jan 1970


    Abstract

    Significant increases in tensile strength and slight decreases in ductility occur when titanium and titanium-base alloys are irradiated at 17 K to 1 to 10×1017 fast neutrons per square centimeter. The magnitude of the irradiation effect appears to depend on total alloy content and, over the fluence range investigated, does not reveal a significant dependence on impurity content or initial heat treat condition. These results were obtained using commercially pure titanium, Ti-5Al-2.5Sn (normal impurity and extralow impurity contents), Ti-6Al-4V (annealed and age hardened conditions), and Ti-8Al-1Mo-1V alloys. Test specimens were exposed to irradiations at 17 K and then tension tested at 17 K without interevning warmup using test loops specially designed and fabricated for cryogenic irradiation testing. Additional results, using commercially pure titanium, show recovery of about 50 percent of the irradiation induced increase in yield strength following heat treatment at 178 K. For the ultimate strength, 50 percent recovery occurred following heat treatment at 78 K.

    Keywords:

    irradiation, neutron irradiation, radiation damage, radiation effects, cryogenics, titanium, titanium alloys, tensile properties, yield strength, brittleness, nuclear propelled rockets


    Paper ID: STP26652S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP26652S


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