Microstructure and kinetics of the plutonium $beta$ $Yields$ $alpha$ and $gamma$ $Yields$ $alpha$ transformations

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Supported-discharge cathodic etching and SEM examination techniques were developed for $alpha$-Pu and used to investigate the $alpha$ microstructures formed by the $beta$/sub $alpha$/ $Yields$ $alpha$ and $beta$/sub $gamma$/ $Yields$ $alpha$ transformations in high-purity extruded Pu at low and high $alpha$-phase temperatures ($beta$/sub $alpha$/ and $beta$/sub $gamma$/ are $beta$ formed from $alpha$ and $gamma$, respectively). Low (200$sup 0$K) $beta$/ sub $alpha$/ $Yields$ $alpha$ transformation temperatures produced $alpha$ with a grain size that was finer than that of the original extruded $alpha$ and substantially smaller than the grain size of the $alpha$ formed from $beta$/sub $gamma$/. At high $alpha$-phase temperatures (343 to ... continued below

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12 p.

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Allen, R.P. & Arrow Smith, H.W. January 1, 1975.

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  • Pacific Northwest Laboratory
    Publisher Info: Battelle Pacific Northwest Labs., Richland, Wash. (USA)
    Place of Publication: Richland, Washington

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Supported-discharge cathodic etching and SEM examination techniques were developed for $alpha$-Pu and used to investigate the $alpha$ microstructures formed by the $beta$/sub $alpha$/ $Yields$ $alpha$ and $beta$/sub $gamma$/ $Yields$ $alpha$ transformations in high-purity extruded Pu at low and high $alpha$-phase temperatures ($beta$/sub $alpha$/ and $beta$/sub $gamma$/ are $beta$ formed from $alpha$ and $gamma$, respectively). Low (200$sup 0$K) $beta$/ sub $alpha$/ $Yields$ $alpha$ transformation temperatures produced $alpha$ with a grain size that was finer than that of the original extruded $alpha$ and substantially smaller than the grain size of the $alpha$ formed from $beta$/sub $gamma$/. At high $alpha$-phase temperatures (343 to 370$sup 0$K), $beta$/sub $alpha$/ transformed to $alpha$ by the surface nucleation and inward growth of colonies of columnar $alpha$ grains oriented radially with respect to the original nucleation site. The transformation kinetics could be correlated with the microstructural observations based on a correspondence between the long axes of the grains and the (010) direction of the monoclinic $alpha$-Pu structure. Significant changes in the size, shape, and orientation of the $alpha$ grains were noted with increasing transformation temperature. Conversely, the grain size of the $alpha$ formed from $beta$/sub $gamma$/ was essentially constant at all transformation temperatures. Metallographic evidence of the $gamma$ $Yields$ $alpha$ skip transformation or a significant change in the mode of the $gamma$ $Yields$ $alpha$ transformation was obtained by a comparison of the $alpha$ microstructures produced by quenching $gamma$ to high (362 to 368$sup 0$K) and low (200$sup 0$K) $alpha$-phase temperatures. (auth)

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12 p.

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Dep. NTIS

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  • 5. international conference on plutonium and other actinides, Baden-Baden, F.R. Germany, 10 Sep 1975

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  • Report No.: BNWL-SA--5328
  • Report No.: CONF-750915--16
  • Grant Number: AT(45-1)-1830
  • Office of Scientific & Technical Information Report Number: 4142084
  • Archival Resource Key: ark:/67531/metadc865328

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • January 1, 1975

Added to The UNT Digital Library

  • Sept. 16, 2016, 12:32 a.m.

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  • Oct. 11, 2017, 3:27 p.m.

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Allen, R.P. & Arrow Smith, H.W. Microstructure and kinetics of the plutonium $beta$ $Yields$ $alpha$ and $gamma$ $Yields$ $alpha$ transformations, article, January 1, 1975; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc865328/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.