SYMPOSIA PAPER Published: 01 January 1970
STP26652S

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

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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.

Author Information

Younger, CL
Lewis Research Center, National Aeronautics and Space Administration, Cleveland, Ohio
Haley, FA
Lewis Research Center, National Aeronautics and Space Administration, Cleveland, Ohio
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Details
Developed by Committee: E10
Pages: 537–563
DOI: 10.1520/STP26652S
ISBN-EB: 978-0-8031-4593-1
ISBN-13: 978-0-8031-0014-5