| Popis: |
Diffusion of helium and formation of helium bubbles in stainless steel in condition of atomic displacement are studied theoretically using standard rate equations [1], Besides this bubble coalescence is assumed to result when collisions occur between bubbles as they migrate by surface diffusion through the solid [2], The dissociative mechanism via self-interstitial He replacement is assumed to control helium diffusion and bubble formation. The theoretically analysis is based on the diatomic nucleation model where two helium atoms are assumed to compose a stable nucleus. For nucleation of interstitial loops, two atoms are assumed to compose a stable nucleaus. In the present work is assumed that coalescence follows bubble collisions resulting from random migration of bubbles in Chandrasekhar’s approximation. International Atomic Energy Agency |
