Plastic flow produced by single ion impacts on metals.

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Single ion impacts have been observed using in situ transmission electron microscopy and video recording with a time resolution of 33 milliseconds. Gold was irradiated at 50 K and room temperature. Single ion impacts produce holes, modify existing holes, and extrude material into the initial specimen hole and holes formed by other ion impacts. The same behavior is observed at both temperatures. At both temperatures, ion impacts result in craters and ejected material. Ion impacts produce more small craters than large ones for all ion masses, while heavier mass ions produce more and larger craters than lighter mass ions. This ... continued below

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19 p.

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Birtcher, R. C. October 30, 1998.

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Description

Single ion impacts have been observed using in situ transmission electron microscopy and video recording with a time resolution of 33 milliseconds. Gold was irradiated at 50 K and room temperature. Single ion impacts produce holes, modify existing holes, and extrude material into the initial specimen hole and holes formed by other ion impacts. The same behavior is observed at both temperatures. At both temperatures, ion impacts result in craters and ejected material. Ion impacts produce more small craters than large ones for all ion masses, while heavier mass ions produce more and larger craters than lighter mass ions. This comparison is affected by the ion energy. As the energy of an ion is increased, the probability for deposition near the surface decreases and fewer craters are formed. For a given ion mass, crater production depends on the probability for displacement cascade production in the near surface region. Crater and holes are stable at room temperature, however, ion impacts near an existing crater may cause flow of material into the crater either reshaping or annihilating it. Holes and craters result from the explosive outflow of material from the molten zone of near-surface cascades. The outflow may take the form of molten material, a solid lid or an ejected particle. The surface is a major perturbation on displacement cascades resulting from ion impacts.

Physical Description

19 p.

Notes

INIS; OSTI as DE00010758

Medium: P; Size: 19 pages

Source

  • 11th International Conference on Ion Beam Modification of Materials, Amsterdam (NL), 08/31/1998--09/04/1998

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  • Report No.: ANL/MSD/CP-96336
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 10758
  • Archival Resource Key: ark:/67531/metadc618523

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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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  • October 30, 1998

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  • June 16, 2015, 7:43 a.m.

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  • April 7, 2017, 6:53 p.m.

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Birtcher, R. C. Plastic flow produced by single ion impacts on metals., article, October 30, 1998; Illinois. (digital.library.unt.edu/ark:/67531/metadc618523/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.