An internal friction study of the allotropic transformations of plutonium, uranium and cobalt

Selle, J.E.; Focke, A.E.

doi:10.1016/0022-3115(69)90055-5

Cited by 10 publications

(3 citation statements)

References 8 publications

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“…64 The relative shear modulus as well as ultrasonic attenuation were measured using an inverted torsion pendulum for the six phases. 65 All pure Pu measurements were performed with polycrystalline samples because monocrystalline pure Pu was not available, however monocrystalline elastic moduli were measured in gallium-stabilized δ-Pu (δ-Pu 3.3 at. % Ga) at ambient temperature using a pulse-echo method by Ledbetter and Moment.…”

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confidence: 99%

Temperature dependence of elastic moduli of polycrystalline β plutonium

et al. 2011

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The elastic moduli of pure polycrystalline beta plutonium were measured over its full range of existence (417 K to 491 K) using resonant ultrasound spectroscopy. The Debye temperature (138 K), Poisson's ratio (0.28), Grüneisen parameter (2.3), and the zerotemperature atomic volume (21.2 Å 3 ) were computed from the measurements. Both bulk and shear moduli decrease smoothly on warming with expected discontinuities at the phase boundaries. The shear modulus is surprisingly nearly the same for beta and gamma Pu. The temperature dependence of bulk moduli for beta Pu is, like gamma Pu, unusually small. Poisson's ratio shows very strong differences among alpha, beta, and gamma Pu indicating they are entirely different metals. The zero-temperature elastic moduli were computed for the three phases as well as for gallium-stabilized delta Pu (also measured by us) and compared to calculations.PACS numbers: 62.20. de, 63.70.+h, 65.40.G-, 62.20.dj

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confidence: 99%

Temperature dependence of elastic moduli of polycrystalline β plutonium

et al. 2011

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“…Above approximately 25°C the amount of retained fi increased progressively with increasing temperature. ITS a later report Nelson^2 5 ' observed that for a grade of Pu less im pure than that used in the previous work the transformation was apparently completed in 10 days even at 75.5°C. On the other hand, for a poorer grade of Pu his results showed that about *0% of ]8 phase was still retained after 12S days at 73.5°C and indicated that the transformation at this temperature would take years to complete.…”

Section: Effect Of Minormentioning

confidence: 72%

“…The use of the internal friction measurement's and the relative shear modulus as a method for distinguishing between martensitic and diffusional transformations has been proposed only recently 5 ' and is far from having been sufficiently tested. It appears that with certain transformations the internal friction above and below the transformation temperature changes very little avid the shear modulus changes over a broad range, while with other transformations inter nal friction suffers a marked change and the relative shear modulus changes over a narrow ran$e of temperature.…”

Section: B Internal Friction and Relative Shear Modulusmentioning

confidence: 99%