Mechanisms of Radiation-Induced Viscous Flow: Role of Point Defects

S. G. Mayr, Y. Ashkenazy, K. Albe, and R. S. Averback

Phys. Rev. Lett. 90, 055505 – Published 6 February 2003

Abstract

Mechanisms of radiation-induced flow in amorphous solids have been investigated using molecular dynamics computer simulations. It is shown for a model glass system, CuTi, that the radiation-induced flow is independent of recoil energy between 100 eV and 10 keV when compared on the basis of defect production and that there is a threshold energy for flow of $\approx 10 e V$ . Injection of interstitial- and vacancylike defects induces the same amount of flow as the recoil events, indicating that point-defect-like entities mediate the flow process, even at 10 K. Comparisons of these results with experiments and thermal spike models are made.

Received 10 July 2002

DOI:https://doi.org/10.1103/PhysRevLett.90.055505

Authors & Affiliations

S. G. Mayr^*, Y. Ashkenazy^†, K. Albe^‡, and R. S. Averback^§

Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 405 West Green Street, Urbana, Illinois 61801

^*Electronic address: smayr@uiuc.edu
^†Electronic address: yinona@uiuc.edu
^‡Permanent address: Institut fur̈ Materialwissenschaft, TU Darmstadt, 64287 Darmstadt, Germany.
^§Electronic address: averback@uiuc.edu

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Vol. 90, Iss. 5 — 7 February 2003

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