Collapse of defect cascades to dislocation loops during self-ion irradiations of Fe, Ni and Cu at 30, 300 and 600/sup 0/K

Conference · Sat Feb 01 04:00:00 EST 1986

OSTI ID:5503361

Kirk, M A; Robertson, I M; Vetrano, J S; Jenkins, M L; Funk, L L

The formation of dislocation loops by self-ion irradiations of Fe, Ni and Cu has been studied in situ in the ANL High-Voltage Electron Microscope as functions of ion dose and irradiation temperature. At low doses (less than or equal to 10/sup 12/ ions/cm/sup 2/) at room temperature individual cascades were observed to collapse to vacancy dislocation loops in Cu with high probability, in Ni with lower probability, and in Fe with zero probability. Cascade collapse was observed at low doses at 30/sup 0/K in Cu and Ni, but at rates less than their respective rates at room temperature. A loop formation rate for Ni at 600/sup 0/K is also reported. At higher doses (>10/sup 13/ ions/cm/sup 2/) where overlap of cascades becomes significant, loops were first observed in Fe and with a supra-linear build-up with dose. Also at higher doses a decrease in loop production rate in Cu and Ni was observed due to loop coalescence. The materials and temperature dependence of cascade collapse probabilities are suggested to be related to thermal spike mechanisms during the cascade formation lifetime.

• Research Organization: Argonne National Lab., IL (USA). Materials Science and Technology Div.; Illinois Univ., Urbana (USA); Oxford Univ. (UK)
• DOE Contract Number: AC02-76ER01198; W-31109-ENG-38
• OSTI ID: 5503361
• Report Number(s): CONF-860605-23; ON: DE86014530
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360106* -- Metals & Alloys-- Radiation Effects
BEAMS
CHARGED PARTICLES
COPPER
COPPER IONS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
ELEMENTS
ION BEAMS
IONS
IRON
IRON IONS
LINE DEFECTS
METALS
NICKEL
NICKEL IONS
PHYSICAL RADIATION EFFECTS
POINT DEFECTS
RADIATION EFFECTS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS
VACANCIES