Blistering behavior and deuterium retention in tungsten vanadium alloys exposed to deuterium plasma in the linear plasma device STEP

Wang, Jun; Cheng, Long; Yuan, Yue; Qin, Shaoyang; Arshad, Kameel; Guo, Wangguo; Wang, Zheng; Zhou, Zhangjian; Lü, Guang-Hong

doi:10.1016/j.jnucmat.2018.01.006

Cited by 17 publications

(9 citation statements)

References 33 publications

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“…The degradation of the surface quality of several types of material is often due to the formation of blisters [1][2][3][4][5][6]. Blistering is caused by voids inside the material which have reached a sufficient size to touch and deform the surface because of the increased pressure of some gas inside the voids [1][2][3][4][5][6][7][8]. In the worst cases blisters burst leaving craters [1,6,[8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Vegard's-law-like dependence of the activation energy of blistering on the x composition in hydrogenated a-SixGe1-x

Serényi

Frigeri²,

Schiller

2018

Journal of Alloys and Compounds

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Surface quality is a key issue in semiconductor structures for device applications. Typical surface defects are blisters. Here we investigate on the relationship between the activation energy of blistering and the composition x in hydrogenated amorphous a-Si x Ge 1-x by employing layers deposited by Radio Frequency sputtering. To this aim the blistering activation energy was determined by means of Arrhenius plots in several samples with different compositions, including x=0 and x=1. Each sample was submitted to heat treatment up to the temperature where the onset of blistering was observed by change of the surface reflectivity. It is found that a linear dependence of the activation energy on x similar to the Vegard's law holds. The experimental result is supported by reaction kinetics modeling. It is suggested that the key step for the formation of blisters is the scission of the SiH and GeH bonds. The related energetic reaction leading to the formation of H 2 molecules in a-Si x Ge 1-x follows a linear law as a function of the x composition similarly to the activation energy.

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Section: Introductionmentioning

confidence: 99%

Vegard's-law-like dependence of the activation energy of blistering on the x composition in hydrogenated a-SixGe1-x

Serényi

Frigeri²,

Schiller

2018

Journal of Alloys and Compounds

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“…All samples were cut from the sintered bulk into samples of 10 × 5 × 1 mm in proportion and mechanical polished to mirror finishing. The relative density and the average grain size of the W-V alloys are summarized in table 1 [30]. Commercial rolled pure W from AT&M company was also employed and the information is reported in table 1.…”

Section: Methodsmentioning

confidence: 99%

Fuzz nanostructure and erosion on tungsten–vanadium alloys exposed to helium plasma in the STEP linear plasma device

et al. 2019

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Tungsten–vanadium (W–V) alloys with 5 and 10 wt.% V made using hot-pressing sintering have been subjected to helium plasma at 1050 K with ion energy of 100 eV for one hour in a linear plasma generator STEP. The W–V alloys consist of three typical phase regions, i.e. the W-enriched region, the W–V solid solute region and the V-enriched region. Slight surface erosion on the W–V solid solute region and severe surface erosion on the V-enriched region are observed on the exposed surface. Sputtering during the He plasma loading contributed to the surface erosion in the W–V solid solute region and the V-enriched region. Slight sputtering on W–V solid solute region is expected given that the lighter alloying element increases the sputtering yield of the W-based material. Moreover, fuzz nanostructure formed on the surface of the W–V alloys under the applied irradiation conditions. The W–V solid solute region exhibits severe fuzz growth in comparison with the W-enriched region when exposed to He plasma, especially in the low flux area. The intense attraction interaction between He and substitutional V atoms aggravates the fuzz growth on the W–V solid solute region. Furthermore, the aggravation effect of V on fuzz nanostructure evolution is mitigated in the high flux area due to the enhanced preferential V sputtering.

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“…Wang et al [23] developed W-V alloys with V concentrations of 5 wt.% and 10 wt.% (denoted as W-5V and W-10V) by powder metallurgy and hot pressing (HP) sintering. Mixed W-V powders with complete W-V solid solution were obtained by high-energy ball milling, and then sintered by HP sintering under a high purity argon atmosphere at 20 MPa and 2100 K for 2 h. The porosity of W-5V and W-10V was 3.51% and 2.28%, respectively, slightly higher than that of the commercial rolled W (1.90%).…”

Section: W-v Alloysmentioning

confidence: 99%

“…Recent research in STEP involves plasma testing of new W-based materials [22][23][24][25], characterizations of H plasmainduced defects [26,27], synergetic effects of high-energy ion implantation and plasma irradiation [28,29], and He behaviours in steels [30,31]. This contribution will first devote one session to the investigation of H plasma-induced defects in pure W to shed light on the fundamental evolution of defects during plasma irradiation.…”

Section: Introductionmentioning

confidence: 99%

Recent studies of tungsten-based plasma-facing materials in the linear plasma device STEP

et al. 2019

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This contribution summarized the recent studies of tungsten-based plasma-facing materials in the linear plasma device like the simulator for tokamak edge plasma (STEP), focusing on the examination of newly developed tungsten (W)-based materials and plasma-induced defects in pure W. Pure W, W-V, W-Y 2 O 3 and W-ZrC samples were exposed to a high-flux plasma of ~ 10 21 -10 22 m −2 s −1 with a fluence up to 10 26 m −2 at a surface temperature below 500 K. The investigation of fundamental evolution of plasma-induced defects in pure W indicated a critical role of hydrogen-dislocation interactions. Suppressed surface blistering was observed in all W-based materials, but deuterium desorption behavior and retention were distinct with respect to different materials. The studies showed that the linear plasma device like the STEP was indispensable in the understanding of plasma-material interactions and the qualification of new materials for future fusion reactors.

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Blistering behavior and deuterium retention in tungsten vanadium alloys exposed to deuterium plasma in the linear plasma device STEP

Cited by 17 publications

References 33 publications

Vegard's-law-like dependence of the activation energy of blistering on the x composition in hydrogenated a-SixGe1-x

Vegard's-law-like dependence of the activation energy of blistering on the x composition in hydrogenated a-SixGe1-x

Fuzz nanostructure and erosion on tungsten–vanadium alloys exposed to helium plasma in the STEP linear plasma device

Recent studies of tungsten-based plasma-facing materials in the linear plasma device STEP

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