Role of divacancies in void swelling
The effect of divacancies on the growth kinetics of dislocation loops and voids has been investigated by incorporating into the rate equations the reactions of vacancy association, divacancy dissociation, divacancy-interstitial interaction, and divacancy loss to unsaturable sinks. Based on the available defect parameters for fcc metals, it was found that the general role of divacancies in diffusion processes is most important in Al and Ni, moderately important in Cu and Ag, and not important in Au. Since the previous analysis was based on the parameters of monovacancies and divacancies from available self-diffusion data, it is worthwhile to examine the sensitivity of the divacancy role in void swelling under irradiation by varying divacancy parameters, such as the binding energy of divacancy, and the preference factor of dislocation for divacancies. The defect generation rate, G, was taken as a constant for both monovacancies and interstitials, and zero for divacancies in the previous paper which is the case for an electron irradiation situation. During neutron or heavy-ion irradiation, displacement damage cascades may produce an appreciable population of divacancies. Therefore, the effect on void swelling of the divacancy source from depleted zones created by displacement cascades is investigated.
- Research Organization:
- Oak Ridge National Lab., TN
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6106585
- Journal Information:
- Scr. Metall.; (United States), Vol. 13:7
- Country of Publication:
- United States
- Language:
- English
Similar Records
Asymmetric dislocation/point-defect interactions and the modeling of void swelling
Dislocation loop bias and void swelling in irradiated α-iron from mesoscale and atomistic simulations
Related Subjects
ALUMINIUM
PHYSICAL RADIATION EFFECTS
VOIDS
COPPER
GOLD
NICKEL
BINDING ENERGY
DISLOCATIONS
SWELLING
VACANCIES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELEMENTS
ENERGY
LINE DEFECTS
METALS
POINT DEFECTS
RADIATION EFFECTS
TRANSITION ELEMENTS
360106* - Metals & Alloys- Radiation Effects
360103 - Metals & Alloys- Mechanical Properties