Abstract
Presented at the Workshop on Effects of Recoil Energy Spectrum and Nuclear Transmutations on the Evolution of Microstructure. March 24–29, 1988 at Lugano, Switzerland An analysis of cascade and subcascade formation in fcc metals by D-T fusion neutron irradiation is made by fitting the experimentally observed distribution of cascade zone size and number of subcascades to the calculated primary recoil energy spectrum. The analysis is made by categorizing subcascades into closely space (Ag, Au) and widely separated (Cu, Ni). The energy subdivided in subcascades is estimated. The estimated energy density in a subcascade is as high as several tens of eV/atom, which is high enough to raise the local temperature far beyond the melting temperature. A discussion is made on the reactions during cascade cooling, suggesting the inadequacy of the conventional radiation damage parameter of DPA. The existence of impact effects from other cascades to reveal the cascade collision induced invisible vacancies as visible vacancy clusters is concluded. A kinetics type of analysis is made on the microstructure evolution by the impact effect, and the sphere of influence of the impact is estimated for each material.
Original language | English |
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Pages (from-to) | 75-96 |
Number of pages | 22 |
Journal | Radiation Effects and Defects in Solids |
Volume | 113 |
Issue number | 1-3 |
DOIs | |
Publication status | Published - 1990 Mar 1 |
Externally published | Yes |
Keywords
- atomic collision
- cascade collision
- fusion reactor materials
- neutron irradiation
- radiation damage
- shock wave
ASJC Scopus subject areas
- Radiation
- Nuclear and High Energy Physics
- Materials Science(all)
- Condensed Matter Physics