Vacancy defects study in Fe based alloys induced by irradiation under various conditions

13th International Workshop on Slow Positron Beam Techniques and Applications

Dawi, K.^1 ; He, C.-W.^1 ; Barthe, M.-F.^1 ; Desgardin, P.^1 ; Volgin, A.^1,2,3,4

CNRS, CEMHTI UPR3079, University Orléans, F-45071 Orléans, France^1

GPM UMR-CNRS 6634, Saint-Etienne du Rouvray, France^2

CSNSM UMR-CNRS 8609, Orsay, France^3

EDF, RandD, France^4

关键词: Fe-based alloys;    High temperature;    Irradiation conditions;    Positron annihilation spectroscopy (PAS);    Single vacancies;    Slow positron beam;    TEM (transmission electron microscopy);    Vacancy cluster;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/505/1/012007/pdf
DOI  :  10.1088/1742-6596/505/1/012007

来源: IOP

【 摘 要 】

In this study, a pure FeNiCr (D302) model alloy has been investigated in parallel with an industrial 316L alloy. Both alloys have been irradiated in different conditions with 5 MeV Ni2+at high temperature (HT) 450°C, and to damage doses: 0.5 or 1 dpa (displacement per atom), or with 1.5 MeV4He2+at room temperature (RT) and to damage dose between 1×10-4and 1×10-2dpa. The positron annihilation spectroscopy (PAS) implemented on a slow positron beam has been used to characterize vacancy defects. The results are compared to other analysis methods such as: TEM (Transmission Electron Microscopy) and APT (Atomic Probe Tomography) reported in [1]. Main results show that only single vacancies have been observed in the case of 316L alloy regardless the irradiation conditions, while vacancy clusters seem to be formed in the case of D302 alloy under HT irradiation conditions and from 1×10-3dpa at RT. The difference observed between 316L and D302 alloys could be linked to a role played by the alloying elements such as silicon.