Characterization of helium-vacancy complexes in He-ions implanted Fe9Cr by using positron annihilation spectroscopy

Zhu, Te; Jin, Shuoxue; Zhang, Peng; Song, Lili; Lian, Xiangyu; Fan, Ping; Zhang, Chenglong; Yuan, Daqing; Wu, Haitao; Yu, Ruan; Cao, Xingzhong; Xu, Qiu; Wang, Boyu

doi:10.1016/j.jnucmat.2018.03.048

Cited by 28 publications

(11 citation statements)

References 20 publications

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“…In order to compare the degree of radiation damage in pure Fe with FeeAu and FeeCu alloys, the S parameters normalized by the unirradiated pure Fe as a function of the positron energy are grouped per fluence level. Although the normalized S parameters cannot quantify the radiation swelling, a reduction in the S parameter is positively correlated in a non-linear manner with the void swelling [48]. As shown in Fig.…”

Section: Variable Energy Positron Annihilation Spectroscopymentioning

confidence: 93%

Self healing of radiation-induced damage in Fe–Au and Fe–Cu alloys: Combining positron annihilation spectroscopy with TEM and ab initio calculations

Zhang

Čı́žek

Yao

et al. 2020

Journal of Alloys and Compounds

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Self healing of early stage radiation damage by site selective solute segregation is a promising approach to extend the lifetime of nuclear reactor components. In the present study, the creation and autonomous healing of irradiation-induced damage is investigated in pure Fe and high purity FeeAu and FeeCu model alloys. To create radiation damage samples are irradiated at 550 C by 120 keV He þ ions with fluences of 5.0 Â 10 15 , 1.0 Â 10 16 and 5.0 Â 10 16 ions/cm 2 . The observed increase in the S and W parameters determined in the variable energy positron annihilation spectroscopy measurements indicates the formation of vacancy-like defects, precipitates and vacancy-solute complexes. The presence of substitutionally dissolved Au is found to reduce the formation of radiation defects more efficiently than solute Cu. Site-specific Au precipitation at defect sites is indicated, which results in damage healing with a reduced swelling, whereas Cu precipitates and radiation damage only show weak interaction. Ab initio calculations show that the binding energies of Au solutes to vacancy clusters (Au-V n ) are significantly larger than those of Cu solutes (Cu-V n ) whereas the binding energies of helium filled vacancy clusters Au-He n V n and Cu-He n V n are comparable.

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Section: Variable Energy Positron Annihilation Spectroscopymentioning

confidence: 93%

Self healing of radiation-induced damage in Fe–Au and Fe–Cu alloys: Combining positron annihilation spectroscopy with TEM and ab initio calculations

Zhang

Čı́žek

Yao

et al. 2020

Journal of Alloys and Compounds

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“…Somewhat higher momentum values (8–14 × 10 −3 m 0 c) were attributed to the helium peak in the CDBS spectra of the Fe–9Cr alloy irradiated by He ions at 550 °C, in the work of Zhu et al [ 73 ]. In this work, the authors investigated the effect of irradiation temperature on the formation of helium–vacancy clusters.…”

Section: Application Of Pas Techniques In Accelerator-based Irradiation Experimentsmentioning

confidence: 99%

Application of Positron Annihilation Spectroscopy in Accelerator-Based Irradiation Experiments

et al. 2021

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Positron annihilation spectroscopy (PAS) is widely recognized as a powerful characterization technique in all types of radiation damage studies in nuclear materials. In the past, fission reactor irradiation of reactor pressure vessel (RPV) steels was a primary aim in most studies, while today’s applications of PAS in this field are centered around ion implantation experiments in advanced structural materials. These experiments use hydrogen, helium, heavy ions, and their combination to simulate various radiation environments of future nuclear reactors or nuclear research facilities. The spectrum of ion energies used ranges from a few tens of keV to tens or even hundreds of MeV in proton irradiation or spallation neutron source irradiation experiments. The variety of ion energies, irradiation temperatures, and other experimental conditions poses a major challenge to researchers, who often fail to successfully incorporate the lessons learned from their research. In this paper, we review and supplement recent PAS studies in which structural materials irradiated under a variety of irradiation conditions were investigated using positron annihilation spectroscopy. It summarizes the most important conclusions and lessons learned from the application of PAS in accelerator-based irradiation experiments.

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“…Positrons were generated by a 50 mCi 22 Na radiation source, and then moderated by tungsten. Monoenergetic positron within the energy range of 0.18-20 keV were implanted into the specimens [8]. Two parameters, namely the S and W parameters, were introduced to characterize the information about the specimens.…”

Section: Positron Annihilation Spectroscopy Measurementsmentioning

confidence: 99%

Positron Annihilation Spectroscopy Characterization of Formation of Helium/Hydrogen-Vacancy Nano-Clusters in FeCr Alloy

et al. 2020

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In the present work, Fe9Cr model alloy was implanted with 100 keV He and 60 keV H ions at room temperature. Positron annihilation Doppler broadening spectroscopy was employed to detect (H, He)-V complexes with open volume in the irradiated specimens. The results show that the positron is sensitive to the relative position of the gas atoms decorating the open volume; i.e., to the configuration of the (H, He)-V complexes. The formation of H-vacancy clusters after H implantation and a large number of vacancies can be retained after H-V decomposes at room temperature. For the pre-implanted He situation (He + H), He-vacancy clusters are formed in advance and the post-implanted H introduces a large number of vacancies and decomposable H-vacancy clusters. The He-vacancy clusters forming in advance may recombine with vacancies and H atoms to form stable He-vacancy clusters and a small amount of He-H-V complex.

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Characterization of helium-vacancy complexes in He-ions implanted Fe9Cr by using positron annihilation spectroscopy

Cited by 28 publications

References 20 publications

Self healing of radiation-induced damage in Fe–Au and Fe–Cu alloys: Combining positron annihilation spectroscopy with TEM and ab initio calculations

Self healing of radiation-induced damage in Fe–Au and Fe–Cu alloys: Combining positron annihilation spectroscopy with TEM and ab initio calculations

Application of Positron Annihilation Spectroscopy in Accelerator-Based Irradiation Experiments

Positron Annihilation Spectroscopy Characterization of Formation of Helium/Hydrogen-Vacancy Nano-Clusters in FeCr Alloy

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