Metal nuclear hardening is one of the most pressing problems in modern materials science. In this paper molecular dynamics simulation was used to study formation and propagation features of shock waves generated by atomic displacement cascades in metal crystallites exposed to radiation with iron crystallite used as an example. The shock wave characteristics dependence on the energy of primary knocked-on atom and the interaction of the shock waves with point defects and their clusters were studied. Shock waves are generated during the first picosecond of the atomic displacement cascades formation and propagate appreciably beyond the area of initial radiation damages. Originally the velocity of their propagation exceeds the speed of sound, but it lessens to the acoustic speed rapidly. Since every subcascade generates its own shock wave and due to material properties anisotropy, wave front has complicated configuration. It stretches along the directions and . The waves propagating along the close-packed direction have maximum velocity and peak amplitude. The shock waves may lead to mobility increase and rearrangement of point defects and their clusters and give rise to local temperature. The shock wave characteristics weakly depend on temperature within the temperature interval 0-300 K. Because of large quantity of shock waves generated, their influence on the defect material structure may be essential.
|Журнал||Problems of Atomic Science and Technology, Series Thermonuclear Fusion|
|Состояние||Опубликовано - 2015|
ASJC Scopus subject areas
- Condensed Matter Physics
- Nuclear and High Energy Physics
- Nuclear Energy and Engineering