Mechanisms of cascade collapse

Conference · Thu Dec 01 04:00:00 EST 1988

OSTI ID:6294002

Smalinskas, K; Averback, R S; Robertson, I M; Hseih, H; Benedek, R

The spontaneous collapse of energetic displacement cascades in metals into vacancy dislocation loops has been investigated by molecular dynamics (MD) computer simulation and transmission electron microscopy (TEM). Simulations of 5 keV recoil events in Cu and Ni provide the following scenario of cascade collapse: atoms are ejected from the central region of the cascade by replacement collision sequences; the central region subsequently melts; vacancies are driven to the center of the cascade during resolidification where they may collapse into loops. Whether or not collapse occurs depends critically on the melting temperature of the metal and the energy density and total energy in the cascade. Results of TEM are presented in support of this mechanism. 14 refs., 4 figs., 1 tab.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6294002
• Report Number(s): CONF-881155-59; ON: DE89009882
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CASCADE THEORY
COMPUTER CODES
COMPUTERIZED SIMULATION
COPPER
COPPER ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
ELECTRON MICROSCOPY
ELEMENTS
IRRADIATION
LINE DEFECTS
M CODES
METALS
MICROSCOPY
NICKEL
NICKEL ALLOYS
POINT DEFECTS
SIMULATION
TRANSITION ELEMENTS
TRANSMISSION ELECTRON MICROSCOPY
VACANCIES