Individual collision cascades in static bcc polycrystals

Journal Article · Mon Apr 01 04:00:00 EST 1985 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.31.4178· OSTI ID:5895848

Hou, M

Collision cascades induced by self-irradiation of polycrystalline tungsten are calculated with the simulation program marlowe. Component analysis is used to describe their spatial configuration. The method is explained and the concepts derived from it enable one to characterize the individual cascades. The influence of the primary energy on their configuration as well as on the point defect and energy densities is shown. Cascades generated by channeled primaries are markedly different from those which undergo no dominant aligned scattering. Subcascade formation in polycrystals results from the channeling of secondary recoils and the probability of its occurrence is found to be greater as the primary energy increases. This contrasts with cascades simulated in random targets where no subcascade formation is observed. In addition, the analysis method reveals strong fluctuations in local point-defect-density distributions. It is suggested that these fluctuations are associated with nonuniformities in the deposited energy-density distributions. Finally, isotropic recombination is shown to affect individual cascade configurations as well as vacancy and interstitial densities in the core of the cascades. The aspects of the individual cascade development studied concur to show that the component analysis brings out specific characteristics that do not appear when the usual statistical approaches are used.

• Research Organization: Universite Libre de Bruxelles, CP 234, Bd du Triomphe, B-1050 Brussels, Belgium
• OSTI ID: 5895848
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 31:7; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360106* -- Metals & Alloys-- Radiation Effects
BCC LATTICES
CHANNELING
COMPUTER CODES
COMPUTERIZED SIMULATION
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
CUBIC LATTICES
DENSITY
DISTRIBUTION FUNCTIONS
ELEMENTS
FLUCTUATIONS
FUNCTIONS
ION CHANNELING
M CODES
METALS
PHYSICAL PROPERTIES
POINT DEFECTS
POLYCRYSTALS
SIMULATION
TRANSITION ELEMENTS
TUNGSTEN
VACANCIES
VARIATIONS