The influence of surface morphology and oxide microstructure on the nucleation and growth of uranium hydride on alpha uranium

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Description

While the bulk kinetics of the uranium-hydrogen reaction are well understood, the mechanisms underlying the initial nucleation of uranium hydride on uranium remain controversial. In this study, the authors have employed environmental cell optical microscopy, Scanning Electron Microscopy (SEM) and Atomic Force Microscopy, (AFM) in an attempt to relate the structure of the surface and the microstructure of the substrate with the susceptibility and site of hydride nucleation. Samples have been investigated with varying grain size, inclusion (carbide) concentration, and thermal history. There is a clear correlation to heat treatment immediately prior to hydrogen exposure. Susceptibility to hydride formation also ... continued below

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7 p.

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Hanrahan, R.J. Jr.; Hawley, M.E. & Brown, G.W. December 31, 1998.

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  • Los Alamos National Laboratory
    Publisher Info: Los Alamos National Lab., Materials Science and Technology Div., NM (United States)
    Place of Publication: New Mexico

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Description

While the bulk kinetics of the uranium-hydrogen reaction are well understood, the mechanisms underlying the initial nucleation of uranium hydride on uranium remain controversial. In this study, the authors have employed environmental cell optical microscopy, Scanning Electron Microscopy (SEM) and Atomic Force Microscopy, (AFM) in an attempt to relate the structure of the surface and the microstructure of the substrate with the susceptibility and site of hydride nucleation. Samples have been investigated with varying grain size, inclusion (carbide) concentration, and thermal history. There is a clear correlation to heat treatment immediately prior to hydrogen exposure. Susceptibility to hydride formation also appears to be related to impurities in the uranium. The oxidized surface is very complex, exhibiting wide variations in thickness and topography between samples, between grains in the same sample, and within individual grains. It is, however, very difficult to relate this fine scale variability to the relatively sparse hydride initiation sites. Therefore, the surface oxide layer itself does not appear to control the sites where hydride attack is initiated, although it must play a role in the induction period prior to hydride initiation.

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7 p.

Notes

INIS; OSTI as DE99000772

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  • Materials Research Society, San Francisco, CA (United States), Nov 1998

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  • Other: DE99000772
  • Report No.: LA-UR--98-2193
  • Report No.: CONF-981124--
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/296785 | External Link
  • Office of Scientific & Technical Information Report Number: 296785
  • Archival Resource Key: ark:/67531/metadc676697

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  • December 31, 1998

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 3, 2016, 1:35 p.m.

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Hanrahan, R.J. Jr.; Hawley, M.E. & Brown, G.W. The influence of surface morphology and oxide microstructure on the nucleation and growth of uranium hydride on alpha uranium, report, December 31, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc676697/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.