EFFECTS INDUCED BY HIGH ELECTRONIC EXCITATIONS IN PURE METALS - A DETAILED STUDY IN IRON

被引:164
作者
DUNLOP, A [1 ]
LESUEUR, D [1 ]
LEGRAND, P [1 ]
DAMMAK, H [1 ]
机构
[1] CTR INTERDISCIPLINAIRE RECH IONS LOURDS,F-14040 CAEN,FRANCE
关键词
D O I
10.1016/0168-583X(94)95566-2
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
Although high electronic excitations were neglected for a long time in radiation effect studies of metallic targets, it is now well established that they can play a dominant role in the damaging processes of some metals. Iron is especially interesting in so far as, according to the rate of energy deposition in electronic excitations (dE/dx)e, various behaviours are observed. Below (dE/dx)e almost-equal-to 40 keV/nm, due to electronic excitations, the amount of damage introduced in the sample is smaller than that expected from the sole elastic collisions. On the contrary, at very high (dE/dx)e levels, a strong enhancement of the damage occurs. After describing the experimental results obtained during low temperature irradiations with a few 10 MeV/nucleon heavy (oxygen to uranium) ions, a phenomenological model which accounts for this intricate behaviour will be presented. Finally, a microscopic mechanism will be proposed to explain how the energy given to the electronic system can play a role in damage processes involving atomic motion. Molecular dynamics simulations validate this approach.
引用
收藏
页码:330 / 338
页数:9
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