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Collapse of defect cascades to dislocation loops

Conference ·
OSTI ID:5926099
; ; ; ; ;
We review a number of experiments that we have recently performed to investigate the collapse of defect cascades to dislocation loops. This important ion and neutron irradiation phenomenon has been studied with in situ ion bombardment in the Argonne National Laboratory High Voltage Electron Microscope-Ion Accelerator Facility at temperatures of 30 and 300/sup 0/K in Cu/sub 3/Au, Cu, and Fe, and 30, 300 and 600/sup 0/K in Ni. These experiments have demonstrated that individual defect cascades collapse to dislocation loops athermally at 30/sup 0/K in some materials (Ni, Cu and Cu/sub 3/Au), while in another material (Fe) only overlapped cascades produced dislocation loops. A slight sensitivity to the irradiation temperature is demonstrated in Cu/sub 3/Au and Fe, and a strong dependence on the irradiation temperature is seen in Ni. This phenomenon of cascade collapse to dislocation loops in metals at 30/sup 0/K provides an understanding for previous neutron irradiation data. The more detailed dependencies of the collapse probability on material, temperature, bombarding ion dose, ion energy and ion mass contribute much information to a thermal spike model of the collision cascade which we will describe.
Research Organization:
Argonne National Lab., Evanston, IL (USA); Illinois Univ., Urbana (USA); Oxford Univ. (UK)
DOE Contract Number:
W-31109-ENG-38
OSTI ID:
5926099
Report Number(s):
CONF-860421-39; ON: DE86010519
Country of Publication:
United States
Language:
English

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ALLOYS
BARYON REACTIONS
BEAMS
COPPER
COPPER ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DEFECTS
DISLOCATIONS
ELEMENTS
GOLD ALLOYS
HADRON REACTIONS
ION BEAMS
IRON
IRRADIATION
LINE DEFECTS
MEDIUM TEMPERATURE
METALS
NEUTRON REACTIONS
NICKEL
NUCLEAR REACTIONS
NUCLEON REACTIONS
TRANSITION ELEMENTS