Vacancy type defect formation in irradiated α-iron investigated by positron beam Doppler broadening technique

He, C W; Dawi, K.; Platteau, Cyril; Barthe, M.F.; Desgardin, P.; Akhmadaliev, Shavkat

doi:10.1088/1742-6596/505/1/012018

Cited by 9 publications

(4 citation statements)

References 11 publications

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“…They did not fi t them but the difference between approximated values of S parameter for surface and saturation are comparable. Similar agreement occurs in the case of investigations provided by He et al [9]. In this case, authors fi tted obtained profi le using VEPFIT [10] getting L + = 160 ± 2 nm.…”

Section: Example Of Pas Resultssupporting

confidence: 88%

Slow positron beam at the JINR, Dubna

et al. 2015

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Na isotope is used. In distinction to popular tungsten foil, here the solid neon is used as moderator. It allows to obtain the beam intensity of about 10 5 e + /s width energy spectrum characterized by full width at half maximum (FWHM) of 3.4 eV and a tail to lower energies of about 30 eV. The paper covers the characteristic of variable energy positron beam at the LEPTA facility: parameters, the rule of moderation, scheme of injector, and transportation of positrons into the sample chamber. Recent status of the project and its development in the fi eld of PAS is discussed. As an example, the measurement of the positron diffusion length in pure iron is demonstrated.

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Section: Example Of Pas Resultssupporting

confidence: 88%

Slow positron beam at the JINR, Dubna

et al. 2015

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“…In the fitting, next to the mentioned A and n, Makhov's parameter m = 1.766 has been used. Positron diffusion length L + , obtained for the reference sample, equals 158 ± 2 nm and it is in a perfect agreement with the one obtained for the defect-free Fe structure [25]. Shortening of L + to only 1 nm proves the existence of open-volume defects with high concentration.…”

Section: Vep Experimentssupporting

confidence: 85%

Application of Positron Annihilation Spectroscopy Techniques for the Long Range Effect Detection

Horodek

2019

Acta Phys. Pol. A

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This paper shows results of conventional positron lifetime and slow positron beam studies of the long range effect. These techniques are not commonly used for this topic. The experimental investigations of pure metals exposed to ion irradiation are reported and discussed on the basis of the literature data. The positron lifetimes measured in the etching experiment give information about kind of defects, their distribution, and existence of the long range effect. The above can be achieved using the positron beam for the case of low energy ion implantation.

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“…He ions may form complexes 32 by combining with the irradiation induced vacancies that are mostly formed in 400–800 nm region. In addition, C, Mn, Ni and Mo present in the alloy may also form complexes with irradiation generated vacancies, as these elements have favorable energetics for the formation of ion-vacancy complexes 33 , 34 . The S-parameter for such ion-vacancy complex is lower than that for an isolated vacancy defect 32 , 34 .…”

Section: Resultsmentioning

confidence: 99%

“…In addition, C, Mn, Ni and Mo present in the alloy may also form complexes with irradiation generated vacancies, as these elements have favorable energetics for the formation of ion-vacancy complexes 33 , 34 . The S-parameter for such ion-vacancy complex is lower than that for an isolated vacancy defect 32 , 34 . At 77 K temperature, since irradiation induced vacancies are nearly immobile, they got arrested within the region of formation i.e.…”

Section: Resultsmentioning

confidence: 99%

Understanding the effect of irradiation temperature on microstructural evolution of 20MnMoNi55 steel

Srivastava

Sharma

Saini

et al. 2022

Sci Rep

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In this study, the effect of irradiation temperature on microstructural evolution of Indian RPV steel is reported. This study, by virtue of helium ion irradiation at 77, 300 and 573 K, could bring out the effect of the irradiation induced defects on microstructural and mechanical property changes at different stages of their existence starting from the state of cascade damage till the point of their free migration. Irradiation experiments were performed with varying ion energies to achieve nearly uniform irradiation damage of 0.05, 0.2 and 3 dpa in a ~ 300 nm wide region. Irradiated samples were characterized using GIXRD, PAS, TEM and nanoindentation. Unirradiated samples showed predominant presence of a combination of di- and tri-vacancy type of defects. Most of the dislocations present in unirradiated samples were screw dislocations, while mixed type was noticed upon irradiation irrespective of the irradiation temperature. PAS study showed formation of distinct defect types at different irradiation temperatures. TEM study confirmed formation of dislocation loops and defect clusters on irradiation. Higher irradiation temperatures resulted in the extension of the width of the damage region owing to increased migration of defects.

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Vacancy type defect formation in irradiated α-iron investigated by positron beam Doppler broadening technique

Cited by 9 publications

References 11 publications

Slow positron beam at the JINR, Dubna

Slow positron beam at the JINR, Dubna

Application of Positron Annihilation Spectroscopy Techniques for the Long Range Effect Detection

Understanding the effect of irradiation temperature on microstructural evolution of 20MnMoNi55 steel

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