Cascade collapse in copper and nickel

Conference · Sun Apr 01 04:00:00 EDT 1990

OSTI ID:7144610

Vetrano, J S; Robertson, I M; Averback, R S ^[1]; Kirk, M A ^[2]

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1. Illinois Univ., Urbana, IL (USA). Dept. of Materials Science and Engineering
2. Argonne National Lab., IL (USA)

In-situ TEM studies of the development of the damage structure produced by heavy ion irradiations have been performed in copper and nickel to investigate the possibility that melting occurs in local regions within displacement cascades. These experiments reveal that as the ion dose increases additional loops form from isolated displacement cascades, but more surprisingly some fo the pre-existing loops are annihilated, change position, size and/or Burgers vector. It was also found that the probability for loop formation and the defect image size are greater in copper than in nickel even at temperatures well below stage 3. It will be demonstrated that these observations provide supporting evidence, albeit indirect, that local melting occurs within the cascade core. These results will be compared to the molecular dynamic computer simulations of the damage created by low energy self-ions in copper and nickel. 15 refs., 4 figs.

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-31109-ENG-38; AC02-76ER01198
• OSTI ID: 7144610
• Report Number(s): CONF-900623-9; ON: DE90011115
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360106* -- Metals & Alloys-- Radiation Effects
CASCADE THEORY
CHARGED PARTICLES
COMPUTERIZED SIMULATION
COPPER
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
ELECTRON MICROSCOPY
ELEMENTS
IONS
IRRADIATION
KRYPTON IONS
LINE DEFECTS
MELTING
METALS
MICROSCOPY
NICKEL
PHASE TRANSFORMATIONS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
SIMULATION
TRANSITION ELEMENTS