Effect of purity on the vacancy defects induced in self–irradiated tungsten: A combination of PAS and TEM

Hu, Zhiwei; Desgardin, P.; Genevois, Cécile; Joseph, Joby; Décamps, B.; Schäublin, R.; Barthe, M.F.

doi:10.1016/j.jnucmat.2021.153175

Cited by 17 publications

(5 citation statements)

References 51 publications

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“…It was indicated that a part of I n can potentially evolve into the dislocation loop [19,53], which can act as important trap site for HI, and affect the HI retention [14]. This means that the experimental total trap may be interstitial-type dislocation.…”

Section: The Clustering Properties During Dynamic Annealingmentioning

confidence: 99%

“…In earlier experiment by Keys et al [16], the recovery of radiation-induced defects in n-damaged W at elevated temperature was observed. In the defect recovery experiment, the behaviour of dislocation loop and vacacny-type defects evolution was characterized by transmission electron microscopy (TEM) [11,13,15] or positron annihilation spectroscopy (PAS) [17][18][19], e.g. Hu et al [19] showed the formation of vacancy-type defect in self-damaged W at low damage level by PAS measurement.…”

Section: Introductionmentioning

confidence: 99%

“…In the defect recovery experiment, the behaviour of dislocation loop and vacacny-type defects evolution was characterized by transmission electron microscopy (TEM) [11,13,15] or positron annihilation spectroscopy (PAS) [17][18][19], e.g. Hu et al [19] showed the formation of vacancy-type defect in self-damaged W at low damage level by PAS measurement. The behavior of dislocation-type defect in damaged region was clarified by TEM [13].…”

Section: Introductionmentioning

confidence: 99%

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Simulation of defect evolution in tungsten during annealing by developing a vacancy and interstitial-type defect evolution model

Wang,

Sang,

Wang

2024

Phys. Scr.

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In this work, a Vacancy and Interstitial-Type Defect Evolution (VITDE) model is developed to study the annealing and clustering behaviors of the irradiation-induced defect in tungsten (W). The post annealing of W-ion damaging at 300K (called post-damaging annealing) and simultaneous annealing of W-ion damaging (called dynamic annealing) are simulated. In the post-damaging annealing case, the W is damaged by 20MeV W-ion irradiation for 1h at 300 K, then the damaged W is annealed for 1h via increasing the temperature to 1000K. In the dynamic annealing case, the defect evolution under simultaneous damaging and annealing is simulated using the same parameters as Case 1. The simulation results indicate the dynamic annealing case has lower induced defects concentration than the post-irradiation annealing case, which is in qualitative agreement with the experiment. The diffusion of interstitial, vacancy, di-interstitial and di-vacancy, and the cluster properties in the defect annealing are investigated and larger size Vn clusters are observed in dynamic annealing case than in post-damaging annealing case. The dependences of the defect evolution on material temperature (T) and grain size are revealed. By increasing the T, the defect concentration is decreased, which reproduces and explains the experimental result. The Vn trap amount with the reduction of grain size for two cases show a larger difference at T = 400K, observing the Vn trap amount is unchanged for post-damaging annealing, whereas it is significantly increased by dynamic annealing.

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Section: The Clustering Properties During Dynamic Annealingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulation of defect evolution in tungsten during annealing by developing a vacancy and interstitial-type defect evolution model

Wang,

Sang,

Wang

2024

Phys. Scr.

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“…The nanocavity total density and their mean size as a function of temperature are plotted in Figure 1a. The large scattering is mainly due to the small number of samples (and micrographs per temperature), local composition variations, variation of the transparency (variation of the sample thickness) and differences in the counting methods (human or automatic) [11,12]. On the same figure, lines represent a likelihood function introduced by Equation ( 4) and adjusted on experimental points.…”

Section: Experimental Datamentioning

confidence: 99%

Multi-Objective Optimization of the Nanocavities Diffusion in Irradiated Metals

et al. 2023

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“…( 10)], which is unfeasible experimentally. The more physical and general method based on the formation volumes of defects, especially voids, should be preferred 1,[47][48][49][50][51] (note that in some sources, formation volumes are used but they are named relaxation volumes 47,48 ).…”

Section: Journal Of Applied Physicsmentioning

confidence: 99%

On the relative contributions of point defect clusters to macroscopic swelling of metals

Jourdan

Nastar

2022

Journal of Applied Physics

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Swelling of metals under irradiation is commonly assessed by calculating the volume fraction of voids, which appear at temperatures where vacancies are mobile. However, other clusters are formed, which may also have an impact on swelling. In particular, interstitial loops have recently been considered to give a significant contribution to swelling owing to their large relaxation volume. In this work, we perform calculations in nickel, based on interatomic potentials, to estimate the contributions of the various point defect clusters. We show that voids produce much more swelling than loops and stacking fault tetrahedra, whose contribution is essentially due to the dislocation core field, inducing a dilatation per unit length of around [Formula: see text], where [Formula: see text] is the Burgers vector. Evaluation of swelling should indeed be done by summing formation volumes, not relaxation volumes, the latter being related to lattice parameter change as measured by x-ray diffraction. We also discuss the case of “lattice swelling” occurring when vacancies are immobile. When self-interstitial atoms cluster as dislocation loops, this swelling mode turns out to be nothing but “void” swelling in a regime where vacancy mobility is so low that vacancies do not cluster appreciably, leaving only interstitial loops visible in transmission electron microscopy.

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Effect of purity on the vacancy defects induced in self–irradiated tungsten: A combination of PAS and TEM

Cited by 17 publications

References 51 publications

Simulation of defect evolution in tungsten during annealing by developing a vacancy and interstitial-type defect evolution model

Simulation of defect evolution in tungsten during annealing by developing a vacancy and interstitial-type defect evolution model

Multi-Objective Optimization of the Nanocavities Diffusion in Irradiated Metals

On the relative contributions of point defect clusters to macroscopic swelling of metals

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