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2025 ANS Winter Conference & Expo
November 9–12, 2025
Washington, DC|Washington Hilton
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Fusion Science and Technology
Latest News
Russia withdraws from 25-year-old weapons-grade plutonium agreement
Russia’s lower house of Parliament, the State Duma, approved a measure to withdraw from a 25-year-old agreement with the United States to cut back on the leftover plutonium from Cold War–era nuclear weapons.
S. L. Robinson, N. Y. C. Yang
Fusion Science and Technology | Volume 21 | Number 2 | March 1992 | Pages 856-860
Material; Storage and Processing | doi.org/10.13182/FST92-A29856
Articles are hosted by Taylor and Francis Online.
The effects of internal tritium and helium on the tensile properties of two austenitic stainless steels and an iron-based superalloy have been studied. The materials tested were, forged 21Cr-6Ni-9Mn and 304L (tested in the annealed condition and two forged conditions), and a modified A-286 alloy. The accumulation of 3He from the radioactive decay of tritium caused an increase in the yield strength and a continuous decrease in the ductility in almost all materials tested. Increased 3He concentrations also caused a change in fracture mode from ductile rupture to predominantly intergranular fracture. The property changes resulted from 3He bubble-induced strengthening, which produced a change in deformation mode from long-range dislocation activity to deformation twinning. In the deformation-twinning mode, the 3He-accelerated fracture initiated at the intersections of deformation twins with grain boundaries. High-strength forged 304L was most resistant to 3He effects, owing to the redistribution of 3He on dislocations.
