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Assessing the Effects of Radiation Damage on Ni-base Alloys for the Prometheus Space Reactor System

Description: Ni-base alloys were considered for the Prometheus space reactor pressure vessel with operational parameters of {approx}900 K for 15 years and fluences up to 160 x 10{sup 20} n/cm{sup 2} (E > 0.1 MeV). This paper reviews the effects of irradiation on the behavior of Ni-base alloys and shows that radiation-induced swelling and creep are minor considerations compared to significant embrittlement with neutron ,exposure. While the mechanism responsible for radiation-induced embrittlement is not f… more
Date: January 19, 2006
Creator: Angeliu, T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigation of Moisture-Induced Embrittlement of Iron Aluminides. Interim Report

Description: Alloy FA-129 undergoes an increase in crack propagation rate and a loss of fracture toughness in moisture-bearing and hydrogen gas environments. A similar effect is seen on ductility of FA-129 in tensile tests. The embrittling effect in air is attributed to oxidation of aluminum in the alloy by water vapor to produce Al{sub 2}O{sub 3} and hydrogen gas. Alloy FAP-Y, which is disordered and contains only 16 a%Al is embrittled by hydrogen gas in a manner similar to that of FA-129. However, laborat… more
Date: April 19, 1994
Creator: Castagna, A. & Stoloff, N. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Plutonium-238 dioxide/T-111 compatibility studies

Description: The tantalum-base alloy, T-111, is an ideal radioisotope encapsulant from the aspect of mechanical properties, but unfortunately undergoes severe oxygen embrittlement during long-term, high-temperature exposure to PuO$sub 2$. A study was undertaken in an effort to improve T-111/PuO$sub 2$ compatibility by testing the hypothesis that reduction of fuel stoichiometry to the range PuO$sub 1$.$sub 75$ to PuO$sub 1$.$sub 8$ would suspend the embrittlement process by producing a state of thermodynamic… more
Date: September 19, 1975
Creator: Jones, G. J.; Selle, J. E. & Teaney, P. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Rapid heating tensile tests of hydrogen-charged high-energy-rate-forged 316L stainless steel

Description: 316L stainless steel is a candidate material for construction of equipment that will be exposed to tritium. Proper design of the equipment will require an understanding of how tritium and its decay product helium affect mechanical properties. This memorandum describes results of rapid heating tensile testing of hydrogen-charged specimens of high-energy-rate-forged (HERF) 316L stainless steel. These results provide a data base for comparison with uncharged and tritium-charged-and-aged specimens … more
Date: May 19, 1989
Creator: Mosley, W. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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On the embrittlement of Zircaloy-4 under RIA-relevant conditions.

Description: The extended use of Zircaloy cladding in light water reactors degrades its mechanical properties by a combination of irradiation embrittlement, coolant-side oxidation, hydrogen pickup, and hydride formation. The hydrides are usually concentrated in the form of a dense layer or rim near the cooler outer surface of the cladding. Utilizing plane-strain ring-stretch tests to approximate the loading path in a reactivity-initiated accident (RIA) transient, we examined the influence of a hydride rim o… more
Date: December 19, 2001
Creator: Daum, R.S.; Majumdar, S.; Billone, M.C.; Bates, D.W.; Koss, D.A. & Motta, A.T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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An atomistic study of the effects of stress and hydrogen on a dislocation lock in nickel

Description: Even though austenitic alloys are commonly used in a hydrogen environment, hydrogen-induced fracture of these alloys has been reported. Most recently it has been shown that the failure of these alloys in hydrogen is initiated by void formation at slip band intersections. It is the object of this work to investigate the atomistic mechanisms that occur at these slip band intersections in the presence of hydrogen. Specifically it has been suggested that dislocation-dislocation interactions may pla… more
Date: March 19, 1998
Creator: Hoagland, R. G. & Baskes, M. I.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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