Suppressing/enhancing effect of rhenium on helium clusters evolution in tungsten: Dependence on rhenium distribution

Yue, Fang-Ya; Li, Yu‐Hao; Ren, Qing-Yuan; Ma, Fang-Fei; Li, Zhong-Zhu; Zhou, Hongbo; Deng, Hui; Zhang, Ying; Lü, Guang-Hong

doi:10.1016/j.jnucmat.2020.152545

Cited by 10 publications

(10 citation statements)

References 80 publications

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“…5(a), the interstitial He atoms have the lowest formation energy and are thus most stable in the interstitial sites in the W-Ta system. Also, it has been reported that the activation energy of He diffusion is higher in W-Ta solid-solutions than in W or W-Re systems [76,77]. Based on these results, it is reasonable to conclude that implanted He atoms are rather uniformly distributed with smaller cluster sizes in the W-Ta system (Fig.…”

Section: Discussionmentioning

confidence: 61%

“…Recent studies have shown that the irradiated particles in W-Re alloys enhance the diffusivity of Re atoms, leading to the formation of Re-clusters [78][79][80]. The Re clusters have high binding energy with He, which enhances the nucleation and growth of He bubbles [76]. Besides, Ta solutes in W-Re-Ta alloys can suppress the formation of the Re-clusters [81,82].…”

Section: Discussionmentioning

confidence: 99%

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Combinatorial Discovery of Irradiation Damage Tolerant Nano-structured W-based alloys

Jo¹,

Park²,

You³

et al. 2022

Preprint

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One of the challenges in fusion reactors is the discovery of plasma facing materials capable of withstanding extreme conditions, such as radiation damage and high heat flux. Development of fusion materials can be a daunting task since vast combinations of microstructures and compositions need to be explored, each of which requires trial-and-error based irradiation experiments and materials characterizations. Here, we utilize combinatorial experiments that allow rapid and systematic characterizations of composition-microstructure dependent irradiation damage behaviors of nanostructured tungsten alloys. The combinatorial materials library of W-Re-Ta alloys was synthesized, followed by the high-throughput experiments for probing irradiation damages to the mechanical, thermal, and structural properties of the alloys. This highly efficient technique allows rapid identification of composition ranges with excellent damage tolerance. We find that the distribution of implanted He clusters can be significantly altered by the addition of Ta and Re, which play a critical role in determining property changes upon irradiation.

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Section: Discussionmentioning

confidence: 61%

Section: Discussionmentioning

confidence: 99%

Combinatorial Discovery of Irradiation Damage Tolerant Nano-structured W-based alloys

Jo¹,

Park²,

You³

et al. 2022

Preprint

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“…The fast Fourier transform (FFT) grid of 160 for the VASP parameters NGXF, NGYF, and NGZF was used to calculate the Bader of the system. The diffusion of He in W was obtained using CI-NEB method calculations [ 19 ]. It should be noted that the energy convergence criteria used to calculate the diffusion of He in W were less than 10 −5 eV.…”

Section: Methodsmentioning

confidence: 99%

“…In addition, in fusion devices, PFMs will be bombarded by intense fluxes of high-energy neutrons, H isotopes, and He particles [ 17 , 18 ], leading to retention of H and He atoms inside the PFMs and production of He bubbles and nanostructure, which will seriously reduce the mechanical stability of PFMs, affecting the service life of W-based PFMs [ 19 ]. The aggregation of He atoms can form bubbles and substantially deteriorate mechanical material properties [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

“…Yue et al showed the strong attraction of Re with He clusters in W, the Re addition effectively reducing the diffusion of He clusters. As for the aggregated Re distribution, the He-trapping capability of vacancy is weakened by Re clusters [ 19 ]. Based on the above fact, there is a lack of systematic research on the effect of alloying element Y on the solution and diffusion behavior of He in W PFMs.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Yttrium on the Solution and Diffusion Behaviors of Helium in Tungsten: First-Principles Simulations

Zhang

Qiu

et al. 2022

Materials

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We systematically investigated the influence of yttrium (Y) on the evolution behavior of helium (He) in tungsten (W) by first-principles calculations. It is found that the addition of Y reduces the solution energy of He atoms in W. Interestingly, the solution energy of He decreases with decreasing distance between Y and He. The binding energies between Y and He are inversely correlated with the effective charge of He atoms, which can be attributed to the closed shell structure of He. In addition, compared with pure W, the diffusion barrier (0.033 eV) of He with Y is lower, calculated by the climbing-image nudged elastic band (CI-NEB) simulations, reflecting that the existence of Y contributes to the diffusion of He in W. The obtained results provide a theoretical direction for understanding the diffusion of He.

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Combinatorial discovery of irradiation damage tolerant nano-structured W-based alloys

Park

You

et al. 2022

Journal of Nuclear Materials

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Suppressing/enhancing effect of rhenium on helium clusters evolution in tungsten: Dependence on rhenium distribution

Cited by 10 publications

References 80 publications

Combinatorial Discovery of Irradiation Damage Tolerant Nano-structured W-based alloys

Combinatorial Discovery of Irradiation Damage Tolerant Nano-structured W-based alloys

The Effect of Yttrium on the Solution and Diffusion Behaviors of Helium in Tungsten: First-Principles Simulations

Combinatorial discovery of irradiation damage tolerant nano-structured W-based alloys

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