The effect of alloying on thermal displacements in uranium and plutonium alloys and the mechanism of stabilization of high-temperature phases by alloying

The effect of light alloying elements in heavy matrices (Mo and Nb in U; Al, Ga, and Ce in Pu) on the magnitude of mean-square thermal atomic displacements has been analyzed. It is shown that light atoms decrease due to the appearance of an additional line in the phonon spectrum at a frequency abo...

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Veröffentlicht in:Physics of metals and metallography 2006-02, Vol.101 (2), p.153-158
Hauptverfasser: Blanter, M. S., Glazkov, V. P., Somenkov, V. A., Orlov, V. K., Laushkin, A. V.
Format: Artikel
Sprache:eng
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Zusammenfassung:The effect of light alloying elements in heavy matrices (Mo and Nb in U; Al, Ga, and Ce in Pu) on the magnitude of mean-square thermal atomic displacements has been analyzed. It is shown that light atoms decrease due to the appearance of an additional line in the phonon spectrum at a frequency above the Debye frequency of the matrix. This results in a stabilization of high-temperature (cubic) polymorphic modifications that have high solubility of alloying elements. The proposed model of changes allows us to explain both the stability of gamma-uranium and delta-plutonium in alloys at room temperature and an increase in the melting temperature of these metals upon alloying.[PUBLICATION ABSTRACT]
ISSN:0031-918X
1555-6190
DOI:10.1134/S0031918X06020086