Point Defect Cluster Formation in Iron Displacement Cascades Up to 50 keV
The results of molecular dynamics displacement cascade simulations in iron at energies up to 50 keV and temperatures of 100, 600, and 900K are summarized, with a focus on the characterization of interstitial and vacancy clusters that are formed directly within the cascade. The fraction of the surviving point defects contained in clusters, and the size distributions of these in-cascade clusters have been determined. Although the formation of true vacancy clusters appears to be inhibited in iron, a significant degree of vacancy site correlation was observed. These well correlated arrangements of vacancies can be considered nascent clusters, and they have been observed to coalesce during longer term Monte Carlo simulations which permit short range vacancy diffusion. Extensive interstitial clustering was observed. The temperature and cascade energy dependence of the cluster size distributions are discussed in terms of their relevance to microstructural evolution and mechanical property changes in irradiated iron-based alloys.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 3662
- Report Number(s):
- ORNL/CP-101223; KC 02 01 04 0; 41 W6 95 3W 1; KC 02 01 04 0; 41 W6 95 3W 1; TRN: AH200112%%502
- Resource Relation:
- Conference: Fall Meeting of the Materials Research Society, Boston, MA (US), 11/30/1998--12/04/1998; Other Information: PBD: 30 Nov 1998
- Country of Publication:
- United States
- Language:
- English
Similar Records
Molecular dynamics studies of defect production and clustering in energetic displacement cascades in copper
Atomic Scale Simulation of 50 keV Si Displacement Cascades in Beta-SiC