Mechanical properties of alpha-neptunium: hardness and elastic moduli

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A study of hardness and elastic moduli of $alpha$-neptunium was conducted. The hardnesses at 203, 240 and 298$sup 0$K were 418, 395, and 346 dph, respectively. The high hardnesses were attributed to the low symmetry of $alpha$-neptunium and the large number of twins in the microstructure. Unusual deformation twinning and slip were observed near the hardness indentations. A second twinning mode, in addition to the reported (110) mode, was suggested by the observations. This twinning was characterized by very narrow, straight twins in contrast to the wide, highly curved twins observed previously in polycrystalline $alpha$-neptunium. An ultrasonic method was used ... continued below

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6 p.

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Merz, M.D. & Kjarmo, H.E. January 1, 1974.

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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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A study of hardness and elastic moduli of $alpha$-neptunium was conducted. The hardnesses at 203, 240 and 298$sup 0$K were 418, 395, and 346 dph, respectively. The high hardnesses were attributed to the low symmetry of $alpha$-neptunium and the large number of twins in the microstructure. Unusual deformation twinning and slip were observed near the hardness indentations. A second twinning mode, in addition to the reported (110) mode, was suggested by the observations. This twinning was characterized by very narrow, straight twins in contrast to the wide, highly curved twins observed previously in polycrystalline $alpha$-neptunium. An ultrasonic method was used to measure sound velocities at 77 to 373$sup 0$K. Elastic moduli and Poisson's ratio were calculated from the sound velocities. The room temperature values for the moduli were: B = 11.7 x 10$sup 11$ dyne/cm$sup 2$; G = 8.28 x 10$sup 11$ dyne/cm$sup 2$; and sigma = 0.22. The values were very nearly the same as the reported moduli of $alpha$-uranium. (auth)

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6 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--5324
  • Report No.: CONF-750915--17
  • Grant Number: AT(45-1)-1830
  • Office of Scientific & Technical Information Report Number: 4142113
  • Archival Resource Key: ark:/67531/metadc869065

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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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  • January 1, 1974

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  • Sept. 16, 2016, 12:32 a.m.

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  • Oct. 11, 2017, 1:44 p.m.

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Merz, M.D. & Kjarmo, H.E. Mechanical properties of alpha-neptunium: hardness and elastic moduli, article, January 1, 1974; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc869065/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.