Swelling with inhomogeneous point defect production: a cascade diffusion theory

Conference · Mon Jan 01 04:00:00 EST 1979

OSTI ID:6298081

Mansur, L K; Coghlan, W A; Brailsford, A D

A theoretical method is described for evaluating the effects of spatially and temporally discrete production in collision cascades on point defect concentrations and swelling in materials during irradiation. The concentrations of vacancies and interstitials at a point which result from their diffusion from all cascades in the material are calculated. Large fluctuations occur with time in the vacancy concentration. The interstitial concentration is nearly always zero except for extremely large spikes of very short duration, corresponding to the occurrence of a cascade anywhere within the sphere beyond which all generated defects are absorbed by sinks before reaching the reference point. The growth rate of a void in this cascade diffusion theory is compared to that given by the more approximate rate theory. The difference is small but increases rapidly at high temperature. Implications of this work for void nucleation, irradiation creep, and analysis of pulsed irradiations are mentioned.

• Research Organization: Oak Ridge National Lab., TN (USA); Ford Motor Co., Dearborn, MI (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6298081
• Report Number(s): CONF-790125-51
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360106* -- Metals & Alloys-- Radiation Effects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700209 -- Fusion Power Plant Technology-- Component Development & Materials Testing
ANALYTICAL SOLUTION
CREEP
DEFECTS
DIFFUSION
MECHANICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
SWELLING
THERMONUCLEAR REACTOR MATERIALS
VOIDS