SYMPOSIA PAPER Published: 01 January 1975

Effect of Irradiation at 130, 650, and 775°F on Tensile Properties of Zircaloy-4 at 70, 650, and 775°F


Six capsules, each containing 240 subsized tension specimens, were irradiated to fluences up to 9 × 1020 neutrons (n)/cm2 (E > 1 MeV) to determine the effect of irradiation at 130, 650, and 775°F on the tensile properties of Zircaloy-4. Other specimens were tested to determine the effects of thermal aging at 650 and 750°F on the properties of Zircaloy-4.

Irradiation at 775°F had no effect on the properties of the cold-worked Zircaloy-4 but did reduce the ductility of the annealed material. The uniform elongation of the annealed material was reduced to 2 percent by irradiation; but, no further decrease in ductility occurred at fluences above 5 × 1020 n/cm2.

Irradiation at 130 and 650°F resulted in an increase in strength and a decrease in ductility of all materials. The uniform elongation was generally less than 0.5 percent at all test temperatures for the specimens receiving an exposure of 5 × 1020 n/cm2 or greater. The change in yield strength after irradiation at 650°F can be approximated by the equation Δσys=A(1eBΦt)1/2

Author Information

Baroch, CJ
Materials and Chemical Technology Laboratory, Babcock and Wilcox Company, Lynchburg, Va.
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Developed by Committee: E10
Pages: 129–142
DOI: 10.1520/STP33683S
ISBN-EB: 978-0-8031-4653-2
ISBN-13: 978-0-8031-0539-3