Cooperative Radiation Effects Simulation Program.
Abstract
The Cooperative Radiation Effects Simulation Program (CORES) is a collaborative effort of the Engineering Materials and Radiation Technology Divisions of the NRL Materials and General Sciences Area. The goal of the research is to provide the theoretical and experimental bases for understanding the mechanisms of void nucleation, as well as a theoretical insight into energy deposition processes. In this the Van de Graaff and Cyclotron are used to simulate rapidly the radiation damage produced over long operating periods in reactor neutron environments. Progress for the period 1 April - 31 August 1976 includes the continuation of studies on the stability of Ni3A1 precipitates in nickel under Ni58(+) ion bombardment. Specimens examined by transmission electron microscopy after irradiation at different dose levels and dose rates showed a modification of the precipitate structure. The precipitate size distribution in the high level, high dose rate specimens decreased in size but increased in density. In the low level, low dose rate specimens, the precipitates developed contrast features but retained their size distribution. In another study a computer program was developed to convert the size of an arbitrary projection of a polyhedral void to a characteristic edge length for the void. These edge lengths can be used to calculate void volumes from the correct formula for each void shape. The microstructure of cold worked, high purity nickel has been investigated following ion-simulated irradiation-induced creep with 22-Me-V alpha particles.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1977
- Accession Number
- ADA039192
Entities
People
- L. A. Beach
- Lendell E. Steele
Organizations
- United States Naval Research Laboratory