Transmission electron microscopy study in-situ of radiation-induced defects in copper at elevated temperatures

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Description

Neutrons and high-energy ions incident upon a solid can initiate a displacement collision cascade of lattice atoms resulting in localized regions within the solid containing a high concentration of interstitial and vacancy point defects. These point defects can collapse into various types of dislocation loops and stacking fault tetrahedra (SFT) large enough that their lattice strain fields are visible under diffraction-contrast imaging using a Transmission Electron Microscope (TEM). The basic mechanisms driving the collapse of point defects produced in collision cascades is investigated in situ with TEM for fcc-Cu irradiated with heavy (100 keV Kr) ions at elevated temperature. The ... continued below

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8 p.

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Daulton, T.L.; Kirk, M.A. & Rehn, L.E. December 1, 1996.

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Description

Neutrons and high-energy ions incident upon a solid can initiate a displacement collision cascade of lattice atoms resulting in localized regions within the solid containing a high concentration of interstitial and vacancy point defects. These point defects can collapse into various types of dislocation loops and stacking fault tetrahedra (SFT) large enough that their lattice strain fields are visible under diffraction-contrast imaging using a Transmission Electron Microscope (TEM). The basic mechanisms driving the collapse of point defects produced in collision cascades is investigated in situ with TEM for fcc-Cu irradiated with heavy (100 keV Kr) ions at elevated temperature. The isothermal stability of these clusters is also examined in situ. Areal defect yields were observed to decrease abruptly for temperatures greater than 300 C. This decrease in defect yield is attributed to a proportional decrease in the probability of collapse of point defects into clusters. The evolution of the defect density under isothermal conditions appears to be influenced by three different rate processes active in the decline of the total defect density. These rate constants can be attributed to differences in the stability of various types of defect clusters and to different loss mechanisms. Based upon observed stabilities, estimations for the average binding enthalpies of vacancies to SFT are calculated for copper.

Physical Description

8 p.

Notes

INIS; OSTI as DE97001983

Source

  • 1996 Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 2-6 Dec 1996

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  • Other: DE97001983
  • Report No.: ANL/MSD/CP--90423
  • Report No.: CONF-961202--54
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/432996 | External Link
  • Office of Scientific & Technical Information Report Number: 432996
  • Archival Resource Key: ark:/67531/metadc676942

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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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  • December 1, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Dec. 14, 2015, 6:26 p.m.

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Daulton, T.L.; Kirk, M.A. & Rehn, L.E. Transmission electron microscopy study in-situ of radiation-induced defects in copper at elevated temperatures, report, December 1, 1996; Illinois. (digital.library.unt.edu/ark:/67531/metadc676942/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.