ON DIFFUSION AND PRECIPITATION OF GAS IN SOLID
Experimental data on the migration and precipitation of gas in solid is not fully explained by the current models. For instance, in certain cases, precipitation of bubbles does not prevent long range migration of the gas, which is in disagreement with the results of commonly adopted calculation models. This paper examines the theories of precipitation of gas into highly pressurized bubbles showing that the elastic strain field produced increases with gas precipitation and does finally lead to a lowering of the precipitation rate. It is demonstrated that this effect is particularly strong in media where the nd diffusion of gas in solid is very rapid compared with the microscopic plastic deformation rate. A simple expression of the precipitation rate is found as a function of the gas and vacancy diffusion coefficients. A discussion follows of the effects of vacancy assisted precipitation in heterogeneous media.
Bibliographic Reference: JOURNAL OF NUCLEAR MATERIALS, VOL. 148 (1987), PP. 316-323
Record Number: 1989126029101 / Last updated on: 1989-01-01
Available languages: en