Molecular dynamics studies of displacement cascades

Conference · Thu Feb 01 00:00:00 EST 1990

DOI:https://doi.org/10.1016/0022-3115(91)90020-8· OSTI ID:6992189

Averback, R S; Benedek, R ^[1]

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1. Argonne National Lab., IL (USA)

Molecular-dynamics simulations of cascades in Cu and Ni with primary-knock-on energies up to 5 keV and lattice temperatures in the range 0 K--700 K are described. Interatomic forces were represented by either the Gibson II (Cu) or Johnson-Erginsoy (Ni) potentials in most of this work, although some simulations using Embedded Atom Method'' potentials, e.g., for threshold events in Ni{sub 3}Al, are also presented. The results indicate that the primary state of damage produced by displacement cascades is controlled by two phenomena, replacement collision sequences during the collisional phase of the cascade and local melting during the thermal spike. As expected, the collisional phase is rather similar in Cu and Ni, however, the thermal spike is of longer duration and has a more pronounced influence in Cu than Ni. When the ambient temperature of the lattice is increased, the melt zones are observed to both increase in size and cool more slowly. This has the effect of reducing defect production and enhancing atomic mixing and disordering. The implications of these results for defect production, cascade collapse, atomic disordering will be discussed. 34 refs., 7 figs., 2 tabs.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6992189
• Report Number(s): CONF-891204-32; ON: DE90009716; TRN: 90-014518
• Resource Relation: Journal Volume: 179-181; Conference: 4. international conference on fusion reactor materials, Kyoto (Japan), 4-8 Dec 1989
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
36 MATERIALS SCIENCE
THERMONUCLEAR REACTOR MATERIALS
PHYSICAL RADIATION EFFECTS
COPPER
CRYSTAL DEFECTS
DISPLACEMENT RATES
DYNAMICS
INTERATOMIC FORCES
MELTING
MOLECULES
NICKEL
NICKEL COMPOUNDS
NUCLEAR CASCADES
CRYSTAL STRUCTURE
ELEMENTS
MATERIALS
MECHANICS
METALS
PHASE TRANSFORMATIONS
RADIATION EFFECTS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
700209* - Fusion Power Plant Technology- Component Development & Materials Testing
360106 - Metals & Alloys- Radiation Effects