Mechanisms of cascade collapse

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The spontaneous collapse of energetic displacement cascades in metals into vacancy dislocation loops has been investigated by molecular dynamics (MD) computer simulation and transmission electron microscopy (TEM). Simulations of 5 keV recoil events in Cu and Ni provide the following scenario of cascade collapse: atoms are ejected from the central region of the cascade by replacement collision sequences; the central region subsequently melts; vacancies are driven to the center of the cascade during resolidification where they may collapse into loops. Whether or not collapse occurs depends critically on the melting temperature of the metal and the energy density and total ... continued below

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Pages: 8

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Diaz de la Rubia, T.; Smalinskas, K.; Averback, R.S.; Robertson, I.M.; Hseih, H. & Benedek, R. December 1, 1988.

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The spontaneous collapse of energetic displacement cascades in metals into vacancy dislocation loops has been investigated by molecular dynamics (MD) computer simulation and transmission electron microscopy (TEM). Simulations of 5 keV recoil events in Cu and Ni provide the following scenario of cascade collapse: atoms are ejected from the central region of the cascade by replacement collision sequences; the central region subsequently melts; vacancies are driven to the center of the cascade during resolidification where they may collapse into loops. Whether or not collapse occurs depends critically on the melting temperature of the metal and the energy density and total energy in the cascade. Results of TEM are presented in support of this mechanism. 14 refs., 4 figs., 1 tab.

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Pages: 8

Notes

NTIS, PC A02/MF A01 - OSTI; 1.

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  • Fall meeting of the Materials Research Society, Boston, MA, USA, 28 Nov 1988

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  • Other: DE89009882
  • Report No.: CONF-881155-59
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 6294002
  • Archival Resource Key: ark:/67531/metadc1112455

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  • December 1, 1988

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

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  • April 19, 2018, 4:35 p.m.

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Diaz de la Rubia, T.; Smalinskas, K.; Averback, R.S.; Robertson, I.M.; Hseih, H. & Benedek, R. Mechanisms of cascade collapse, article, December 1, 1988; Illinois. (digital.library.unt.edu/ark:/67531/metadc1112455/: accessed November 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.