Saturation and exposure dependence of the yield stress of irradiated iron

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Abstract
The yield stress data of irradiated Ferrovac iron are shown to be closely approximated by the expression Δ[sgrave]=A[1—exp (—Bφt)]1/2 with a saturation exposure of 2 × 1019 nvt (E > 1·45 MeV). The maximum increment in the yield stress is 25 000 p.s.i. and the volume of the defect calculated from B is 4·4 × 10−19 cm3. If the defect is considered a spherical depleted zone this corresponds to a diameter of 95 Å and the actual defect is probably near 50 Å in diameter at saturation. Deviations at low exposures are explained on the basis of enhanced carbide precipitation. The mode of zone production and growth is believed dependent on the amount of available (mobile) carbon.