Influence of nanochannel structure on helium-vacancy cluster evolution and helium retention

Qin, Wenjing; Jin, S.; Cao, Xingzhong; Wang, Yongqiang; Peres, P.; Choi, S.; Jiang, Changzhong; Ren, Feng

doi:10.1016/j.jnucmat.2019.151822

Cited by 21 publications

(5 citation statements)

References 38 publications

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“…Under the irradiation of high temperature and high beam He plasma at more than 5000 s, only tungsten in the range of 72 nm from top surface is transformed into fuzz structure in nanochannel thin films, while the surface of irradiated bulk tungsten alloy would be seriously eroded. The result indicated the effectively relieve thermal stress and maintain resistance to the He nucleation and "fuzz" formation behavior of nanochannel structure under high-temperature irradiation [115,116]. The previous work [112] has shown that {100} surface in tungsten might own better resistance to morphology change due to the larger binding energy.…”

Section: Nanochannel Tungsten Enhances Radiation Tolerancementioning

confidence: 88%

Recent progress of radiation response in nanostructured tungsten for nuclear application

Pei

et al. 2021

Tungsten

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Engineering materials for nuclear reactors exposed to high-dose irradiation breed various radiation damage, leading to performance degradation of materials, which seriously limits the application of materials in the future advanced nuclear reactors. Tungsten-based materials applied in future nuclear reactors have to withstand not only the attack of high-energy neutron and plasma, but also the repeated impact of steady-state or even transient thermal load. Researches in the past decades have proved that tailored nanostructure have advantage in annihilating radiation defects. With the rapid development of nanostructured tungsten, probing radiation application of nanostructured tungsten is of great significance in promoting the development of novel radiation-resistant materials. Herein, the development status of three kinds of nanostructured tungsten namely nanocrystalline, nanofilm and nanoporous tungsten designed for radiation tolerance and the performance enhancement mechanism of diverse nanostructure in irradiation environment is reviewed. Finally, future perspectives and technical challenges are discussed, to inspire more creative designs of novel nanostructured tungsten for radiation tolerance.

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Section: Nanochannel Tungsten Enhances Radiation Tolerancementioning

confidence: 88%

Recent progress of radiation response in nanostructured tungsten for nuclear application

Pei

et al. 2021

Tungsten

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“…The related He retention fluences obtained from the He quantified depth profiles are shown in Table 2. At such low irradiated fluence, the nanochannel structure still contributed to the release of He atoms, and He release at higher temperature (600 ºC) increased significantly while it did not change at lower temperature (300 ºC) at the same fluence [34]. The ability of the nanochannels in managing He release are verified by the doppler broadening spectroscopy (DBS) and SIMS technologies, and irradiation fluence and temperature have great effect on the He retention and vacancy-type clusters.…”

Section: Kev He + Ions Irradiation Under Low Fluencementioning

confidence: 90%

“…Due to the small size of vacancy or He-vacancy cluster, it is difficult to study directly using the traditional characterization methods such as TEM. Combining the advantages of positron annihilation doppler broadening spectroscopy (PA-DBS) and secondary ion mass spectrometry (SIMS), the evolution of vacancy-type defects in the nanochannel W film at low fluences was explored [34]. The irradiation energy of He + ions was set at 190 keV considering the detection range and surface effect of positron annihilation device.…”

Section: Kev He + Ions Irradiation Under Low Fluencementioning

confidence: 99%

Review on helium behaviors in nanochannel tungsten film

et al. 2021

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Tungsten (W) as plasma facing material (PFM) needs to face an unprecedented harsh environment in the fusion reactor, which puts forward high requirements for its radiation tolerance. Among the many challenges, the rapid accumulation of helium (He) atoms to form numerous bubbles or even "fuzzy" nanostructure leads to swelling and embrittlement of W matrix and seriously shorten its service life, which is one of the most serious problems faced by PFM-W at present. In this review, we summarize the recent works on the nanochannel W films with high surface-to-volume ratio deposited by magnetron sputtering, and the behaviors of He in the nanochannel W films at different fusion-related irradiation environment. Experimental and simulation results showed that the nanochannel W films have better radiation tolerance performance in managing He behaviors than that of commercial bulk W.

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“…However, material microstructures can be engineered to tolerate the helium irradiation environment to mitigate the effects of He bubble accumulation. Strategies for limiting helium bubble effects in metals include decreasing the grain size [11,12], intentionally controlling the columnar microstructure [13,14], alloying [15,16], and introducing second phase interfaces/interphases [17][18][19]. Trapping He bubbles at the second phase precipitates or at interfaces in layered composites can mitigate the He effects in the matrix and may be more stable at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Compositional Effects of Additively Manufactured Refractory High-Entropy Alloys under High-Energy Helium Irradiation

et al. 2022

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High-Entropy Alloys (HEAs) are proposed as materials for a variety of extreme environments, including both fission and fusion radiation applications. To withstand these harsh environments, materials processing must be tailored to their given application, now achieved through additive manufacturing processes. However, radiation application opportunities remain limited due to an incomplete understanding of the effects of irradiation on HEA performance. In this letter, we investigate the response of additively manufactured refractory high-entropy alloys (RHEAs) to helium (He) ion bombardment. Through analytical microscopy studies, we show the interplay between the alloy composition and the He bubble size and density to demonstrate how increasing the compositional complexity can limit the He bubble effects, but care must be taken in selecting the appropriate constituent elements.

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Influence of nanochannel structure on helium-vacancy cluster evolution and helium retention

Cited by 21 publications

References 38 publications

Recent progress of radiation response in nanostructured tungsten for nuclear application

Recent progress of radiation response in nanostructured tungsten for nuclear application

Review on helium behaviors in nanochannel tungsten film

Compositional Effects of Additively Manufactured Refractory High-Entropy Alloys under High-Energy Helium Irradiation

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