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- W1671014585 abstract "Irradiation of metals with high‐energy particles produces nano‐scale defects that act as obstacles to dislocation glide. This paper presents the effects of low‐level neutron radiation on the stress rupture and microstructural properties of two tantalum alloys, Ta‐10%W and Ta‐8%W‐2%Hf (T‐111), which have been used to encapsulate radioactive fuel for space Radioisotope Power Systems (RPS). Ta‐10%W and T‐111 test specimens were exposed to a neutron fluence level (1.2×1015 nvt) at temperatures less than <0.2 Tm, which is equivalent to the cumulative fluence associated with the 30‐year mission life of a RPS. This fluence level results in an atomic displacement damage of approximately 3.0×10−7 dpa in both alloys. The atomic displacement damage produces an approximate two‐order of magnitude increase in the stress rupture time, and a two‐order of magnitude reduction in steady state creep rate. These observations are statistically significant at the 0.05 significance level. Transmission electron microscopy of rupture specimens reveals that the interaction of the irradiation produced defects with ao/2<111> screw dislocations results in a five‐fold increase in dislocation density and a pronouncement of the ordering of dislocations into mosaic patterns of cellular or subgranular arrangements. The results of this research are significant because they provide a basic understanding of the strength mechanisms in two tantalum alloys (Ta‐10%W and T‐111) resulting from neutron irradiation at temperatures <0.2 Tm." @default.
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- W1671014585 date "2008-01-01" @default.
- W1671014585 modified "2023-09-24" @default.
- W1671014585 title "Investigation of Stress Rupture Tested Neutron Irradiated Tantalum Alloys" @default.
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- W1671014585 doi "https://doi.org/10.1063/1.2844999" @default.
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