کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1685743 | 1010574 | 2008 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Characterization of defect accumulation in neutron-irradiated Mo by positron annihilation spectroscopy Characterization of defect accumulation in neutron-irradiated Mo by positron annihilation spectroscopy](/preview/png/1685743.png)
Positron annihilation lifetime spectroscopy measurements were performed on neutron-irradiated low carbon arc cast Mo. Irradiation took place in the high flux isotope reactor, Oak Ridge National Laboratory, at a temperature of 80 ± 10 °C. Neutron fluences ranged from 2 × 1021 to 8 × 1024 n/m2 (E > 0.1 MeV), corresponding to displacement damage levels in the range from 7.2 × 10−5 to 2.8 × 10−1 displacements per atom (dpa). A high density of submicroscopic cavities was observed in the neutron-irradiated Mo and their size distributions were estimated. Cavities were detected even at a very low-dose of ∼10−4 dpa. The average size of the cavities did not change significantly with dose, in contrast to neutron-irradiated bcc Fe where cavity sizes increased with increasing dose. It is suggested that the in-cascade vacancy clustering may be significant in neutron-irradiated Mo, as predicted by molecular dynamics simulations.
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 266, Issue 16, August 2008, Pages 3602–3606