Internal friction of neptunium

Selle, J.E.; Rechtien, James J.

doi:10.1016/0022-3115(69)90193-7

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…The molar volume increases by ~2.8% at the α-β transition, and by ~4.5% at the β-γ transition. These values differ from those presented by Wittenberg and colleagues (3.3 and 3.6% increases in volume at the α-β and β-γ transformations, respectively) [414,415] and by Selle and Rechtien (increases of 2.85 and 3.25%) [194]. The reasons for these differences are not clear.…”

Section: Density and Volumecontrasting

confidence: 66%

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FCRD Advanced Reactor (Transmutation) Fuels Handbook

Janney

Papesch

2016

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Transmutation of minor actinides such as Np, Am, and Cm in spent nuclear fuel is of international interest because of its potential for reducing the long-term health and safety hazards caused by the radioactivity of the spent fuel. One important approach to transmutation (currently being pursued by the DOE Fuel Cycle Research & Development Advanced Fuels Campaign) involves incorporating the minor actinides into U-Pu-Zr alloys, which can be used as fuel in fast reactors. U-Pu-Zr alloys are well suited for electrolytic refining, which leads to incorporation rare-earth fission products such as La, Ce, Pr, and Nd. It is, therefore, important to understand not only the properties of U-Pu-Zr alloys but also those of U-Pu-Zr alloys with concentrations of minor actinides (Np, Am) and rare-earth elements (La, Ce, Pr, and Nd) similar to those in reprocessed fuel.

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Section: Density and Volumecontrasting

confidence: 66%

“…Measurements of phase-transformation and melting temperatures of Np are in good agreement. Phase-transformation mechanisms are less well known, but were investigated by Selle and Rechtien [194].…”

Section: Phase Transformationsmentioning

confidence: 99%

FCRD Advanced Reactor (Transmutation) Fuels Handbook

Janney

Papesch

2016

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“…Thus, E 0 and σ p are temperature dependent. To reflect this, the quantities at temperature T were calculated by E 0 (T) = E 0 (0K)•G(T)/G(0K) and σ p (T) = σ p (0K)•G(T)/G(0K) using dG/dT = −26 MPa/K [27] and G(293 K) = 77.3 GPa, obtained from E = 204 GPa as Young's modulus at room temperature [21] and Poisson s ratio ν = 0.32 [28]. As a result, E 0 = 3.29 eV, σ p = 1141 MPa and E 0 = 3.14 eV, σ p = 1089 MPa were obtained at 800 • C and 900 • C, respectively.…”

Section: Compression Tests At Ambient and Elevated Temperatures Parti...mentioning

confidence: 99%

Investigation of TaC and TiC for Particle Strengthening of Co-Re-Based Alloys

Seif,

Rösler,

Werner

et al. 2023

Materials

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Cobalt-Rhenium (Co-Re)-based alloys are currently investigated as potential high-temperature materials with melting temperatures beyond those of nickel-based superalloys. Their attraction stems from the binary Co-Re phase diagram, exhibiting complete miscibility between Co and Re, whereby the melting temperature steadily increases with the Re-content. Thus, depending on the Re-content, one can tune the melting temperature between that of pure Co (1495 °C) and that of pure Re (3186 °C). Current investigations focus on Re-contents of about 15 at.%, which makes melting with standard equipment still feasible. In addition to solid solution strengthening due to the mixture of Co- and Re-atoms, particle strengthening by tantalum carbide (TaC) and titanium carbide (TiC) precipitates turned out to be promising in recent studies. Yet, it is currently unclear which of the two particle types is the best choice for high temperature applications nor has the strengthening mechanism associated with the monocarbide (MC)-precipitates been elucidated. To address these issues, we perform compression tests at ambient and elevated temperatures on the particle-free base material containing 15 at.% of rhenium (Re), 5 at.% of chromium (Cr) and cobalt (Co) as balance (Co-15Re-5Cr), as well as on TaC- and TiC-containing variants. Additionally, transmission electron microscopy is used to analyze the shape of the precipitates and their orientation relationship to the matrix. Based on these investigations, we show that TiC and TaC are equally suited for precipitation strengthening of Co-Re-based alloys and identify climb over the elongated particles as a rate controlling particle strengthening mechanism at elevated temperatures. Furthermore, we show that the Re-atoms are remarkably strong obstacles to dislocation motion, which are overcome by thermal activation at elevated temperatures.

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Phase transformations in uranium, plutonium, and neptunium

Rechtien

Nelson²

1973

Metall Trans

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Internal friction of neptunium

Cited by 6 publications

References 3 publications

FCRD Advanced Reactor (Transmutation) Fuels Handbook

FCRD Advanced Reactor (Transmutation) Fuels Handbook

Investigation of TaC and TiC for Particle Strengthening of Co-Re-Based Alloys

Phase transformations in uranium, plutonium, and neptunium

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