Effect of crystal orientation on low flux helium and hydrogen ion irradiation in polycrystalline tungsten

Liu, Fangshu; Ren, Haitao; Peng, Shixiang; Zhu, Kaigui

doi:10.1016/j.nimb.2014.04.004

Cited by 32 publications

(6 citation statements)

References 17 publications

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“…For each sample, lateral grain size determination was done for at least 40 grains. As the sputtering process/channeling depends on the crystallographic grain orientations because of different surface BEs of surface atoms and different open channels, 39 XRD analysis was performed to investigate the texture of the Au films. In Figure 4, the result obtained for the virgin Au/Cr sample is plotted as a map of ω − 2θ scans in dependence of the tilt angle ψ (sample Au/Ti shows similar results).…”

Section: Resultsmentioning

confidence: 99%

Morphological and Functional Modifications of Optical Thin Films for Space Applications Irradiated with Low-Energy Helium Ions

Pelizzo

Corso

Tessarolo

et al. 2018

ACS Appl. Mater. Interfaces

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Future space missions will operate in increasingly hostile environments, such as those in low-perihelion solar orbits and Jovian magnetosphere. This exploration involves the selection of optical materials and components resistant to the environmental agents. The conditions in space are reproduced on ground through the use of ion accelerators. The effects of He particles coming from the solar wind impinging on a gold thin film have been systematically investigated, considering absorbed doses compatible with the duration of the European Space Agency Solar Orbiter mission. Structural and morphological changes have been proved to be dependent not only on the dose but also on the irradiation flux. A predictive model of the variation of thin film reflectance has been developed for the case of lower flux irradiation. The results are discussed regarding reliability and limitations of laboratory testing. The outcomes are important to address the procedures for the space qualification tests of optical coatings.

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Section: Resultsmentioning

confidence: 99%

Morphological and Functional Modifications of Optical Thin Films for Space Applications Irradiated with Low-Energy Helium Ions

Pelizzo

Corso

Tessarolo

et al. 2018

ACS Appl. Mater. Interfaces

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“…These differences can be attributed to the crystal orientation. Previous studies show that radiation resistance of (100) crystal plane was strongest, (110) crystal plane took the second place, and (111) plane was the weakest [11,25]. Therefore, the He blisters which lids flaked off should occur on the (111) plane, and the partially cracked He blisters may take place on (110) crystal plane, and the no cracked He blisters occurred on (100) crystal plane.…”

Section: Inhibition Of Surface Blistering On W Followed By D Plasma E...mentioning

confidence: 95%

“…One is burst He blisters (as indicated by the red arrow), the second is high dome blisters with a large ratio of height and diameter (as indicated by the blue arrow), the third is small He blisters (as indicated by the yellow arrow). These may be caused by the difference of grain orientation, since the irradiation resistance of grains dependent on the grain orientation, resulting in the differences of surface blistering [11,25]. Figure 4(c) shows the microstructure under a blister lid.…”

Section: Surface Topography Of W Pre-implantation By Mass-separated H...mentioning

confidence: 99%

Evolution of surface morphology and helium bubble in tungsten under 40 keV helium ions implantation followed by deuterium plasma exposure

Xia¹,

Wang²,

Jiang³

et al. 2022

Phys. Scr.

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Surface morphology and internal microstructure of tungsten (W) pre-implanted by 40 keV mass-separated helium (He) ions with different fluences at room temperature were investigated in this work. The morphology Changes of the samples were analyzed almost in situ, by repetitively examined the specified irradiation area which is marked by focused ion beam technology. As the samples were implanted by He ion with a fluence of 6 × 1020 He/m2, no He blisters or other microstructures could be found on the surface. When the fluence reaches 6 × 1021 He/m2, a large number of He blisters with the size of ~1 µm were observed on the W specimens. For the results of the subsequent deuterium plasma exposure, instead of deuterium-induced blistering, no changes on the W surface which pre-irradiated by He ion irradiation at low fluence (6 × 1020 He/m2). Surprisingly, for He ions pre-implanted W with high fluence (6 × 1021 He/m2), almost all the He blisters were cracked and their lids even peeled off. It could be attributed to the lateral stress caused by subsequent D exposure. Moreover, the size of He bubbles was also increased under subsequent deuterium exposure, suggesting that He atoms can attract D atoms. No deuterium blisters were found on these samples which were pre-implanted with high and low fluences, suggesting that He ion pre implantation can effectively inhibit the surface blistering caused by deuterium exposure.

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“…It has been indicated that the functional properties and structure performance of W in terms of particle irradiation resistance [8][9][10][11][12][13][14][15][16][17], surface morphology after irradiation [18][19][20][21], thermal conductivity [22] and fracture toughness [23] were related to its crystal orientation. Specifically, W grains with low crystallographic index displayed better irradiation resistance under deuterium plasma [8], helium neutral beam [9], helium/ hydrogen ions [10] and Ga + ion [11]. Surface morphology after irradiation was correlated with the normal direction of grain [19].…”

Section: Introductionmentioning

confidence: 99%

Texture evolution of tungsten materials during recrystallization

Zhang¹,

Zheng²,

Huang³

et al. 2020

Mater. Res. Express

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Some functional and structural performance of tungsten (W) are related to its texture characteristics. Usually, W serves in high temperature and may undergo recrystallization. Thus it's necessary to evaluate the recrystallization texture of W. In our previous studies, pure W (PW) and W-1.0wt%La 2 O 3 (WL10) were deformed via unidirectional rolling (UNR), cross rolling (CRR) and clock rolling (CLR) with 80% reduction. In the present paper, PW-UNR, PW-CRR, PW-CLR and WL10-UNR were subjected to annealing at 2073 K for 2 h to achieve recrystallization and figure out the evolution mechanism of recrystallization texture in W materials. Besides, the effect of La 2 O 3 on recrystallization texture of W was discussed. The results indicated that the fiber textures in rolling state were transformed into isolated textures after recrystallization. {001}〈uvw〉 isolated texture formed in the recrystallized W may be mainly resulted from the texture inheritance. {113}〈361〉 isolated texture formed in the recrystallized WL10-UNR may be attributed to the orientated growth of {113}〈361〉 grains with high grain boundary mobility facilitated by La 2 O 3 . Generally, isolated textures near θ-fiber were strengthened while γ-fiber was weakened for W during recrystallization, which is an effective method to achieve W with more {001} and less {111} textures.

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Effect of crystal orientation on low flux helium and hydrogen ion irradiation in polycrystalline tungsten

Cited by 32 publications

References 17 publications

Morphological and Functional Modifications of Optical Thin Films for Space Applications Irradiated with Low-Energy Helium Ions

Morphological and Functional Modifications of Optical Thin Films for Space Applications Irradiated with Low-Energy Helium Ions

Evolution of surface morphology and helium bubble in tungsten under 40 keV helium ions implantation followed by deuterium plasma exposure

Texture evolution of tungsten materials during recrystallization

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