Helium bubble formation on tungsten in dependence of fabrication method

Yamagiwa, M.; Kajita, Shin; Ohno, Noriyasu; Takagi, Makoto; Yoshida, N.; Yoshihara, Reiko; Sakaguchi, Wataru; Kurishita, Hiroaki

doi:10.1016/j.jnucmat.2011.02.007

Cited by 65 publications

(26 citation statements)

References 14 publications

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“…Due to severe irradiation damage like exfoliation and sputtering by implanted He at the maximum fluence, larger sunken areas appeared to some grains on the surface of metallic W. The orientation-dependent sputtering phenomenon might occur by defects such as dislocations and grain boundaries in the crystalline materials [28]. Different grains developed into different morphologies under irradiation, which was related to grain orientation [29]. He 2+ ions caused severe irradiation damage to alloy V 90.62 Cr 4.69 Ti 4.69 , and large helium bubbles were formed in the alloy for migration and release [30], thus resulting in blistering, peeling, cracking and other phenomena [31].…”

Section: Srim Calculated Simulation Resultsmentioning

confidence: 99%

Resistance to He2+ irradiation damage in metallic glass Fe80Si7.43B12.57

Hou

Mei

Wang

2015

Nuclear Instruments and Methods in Physics Research Section B:

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Section: Srim Calculated Simulation Resultsmentioning

confidence: 99%

Resistance to He2+ irradiation damage in metallic glass Fe80Si7.43B12.57

Hou

Mei

Wang

2015

Nuclear Instruments and Methods in Physics Research Section B:

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“…Surface morphology evolution of the ion beamirradiated solid material was caused by competition between ion bombardment-inducing roughness and internal material transportation-inducing smoothness [33]. The metallic glass surface was smooth because of its disordered structure, without the orientation-dependent sputtering phenomenon in crystal materials [34]. Therefore, there was no obvious sign of irradiation damage in the metallic glass Ta 38 Ni 62 surface.…”

Section: Discussionmentioning

confidence: 99%

“…Once nucleated, the helium easily adsorbed other surrounding helium atoms and vacancies or merged to form helium bubbles, which grew in combination and connection. When the bubble pressure reached a certain critical value, the stress generated by internal pressure could be released only through surface deformation, and resulted in blistering [34]. V 87.5 Cr 4.17 Ti 4.17 Nb 4.17 alloy had a low helium solubility and diffusivity and therefore experienced multi-layer peeling.…”

Section: Discussionmentioning

confidence: 99%

Resistance to He2+ irradiation damage in metallic glass Ta38Ni62

Hou

Mei

Zhang

et al. 2016

Applied Surface Science

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a b s t r a c tMetallic glass Ta 38 Ni 62 strips, metallic W, and V 87.5 Cr 4.17 Ti 4.17 Nb 4.17 alloy were irradiated using a 500 keV He 2+ ion beam at different fluence to compare the metallic glass resistance to irradiation. Metallic glass Ta 38 Ni 62 remained amorphous at different He 2+ irradiation fluence. Transmission electron microscopy analysis revealed the presence of helium bubbles at the end of the range of helium ions in the metallic glass. No significant damage resulted in the metallic glass surface, and the root mean square roughness increased nonlinearly with the increase in fluence. At 1 × 10 18 ions/cm 2 , metallic W appeared in larger sunken areas on the surface and V 87.5 Cr 4.17 Ti 4.17 Nb 4.17 alloy experienced multi-layer flaking. The metallic glass Ta 38 Ni 62 resistance to He 2+ ion beam irradiation was better than that of metallic W, and that of the V 87.5 Cr 4.17 Ti 4.17 Nb 4.17 alloy was the poorest.

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“…7) confirms the predicted morphology of this stage. Subsurface He-bubbles have been observed with transmission electron microscopy by other researchers [16,17]. In addition, it is seen from Fig.…”

Section: Discussionmentioning

confidence: 57%

Effects of temperature on surface modification of W exposed to He particles

Greuner

Yuan

et al. 2014

Journal of Nuclear Materials

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The effect of combined heating and helium particle flux on annealed tungsten samples has been studied in the neutral beam facility GLADIS. He beams with power densities of 2.4 MW/m 2 and 9.5 MW/m 2 were used to adiabatically load the samples to peak surface temperatures from ~ 950 °C (1223 K) to ~ 2700 °C (2973 K). Changes in the surface morphology resulting from combined heat and the flux exposure were studied for He fluences up to 3×10 22 /m 2 . Typical structures for the sample loaded at ~ 950 °C (1223 K) were blisters with a clear grain orientation dependence and the largest blisters formed on grains with <001> surface normal. However at higher temperatures, blistering was more easily suppressed for grains near this orientation because the growth of larger blister takes place more slowly. An evolution from a "porous structure" to a "coral-like structure" with increasing fluence was observed on the samples loaded at the highest temperature. Based on these results mechanisms for surface modification at different temperatures are discussed and a texture with <001> parallel to the normal direction of the grains is suggested to optimize the plasma facing material due to their stronger resistance to early stage blistering.

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Helium bubble formation on tungsten in dependence of fabrication method

Cited by 65 publications

References 14 publications

Resistance to He2+ irradiation damage in metallic glass Fe80Si7.43B12.57

Resistance to He2+ irradiation damage in metallic glass Fe80Si7.43B12.57

Resistance to He2+ irradiation damage in metallic glass Ta38Ni62

Effects of temperature on surface modification of W exposed to He particles

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