Effect of He on the hardness and incipient plasticity of W films during nanoindentation

Wang, Zizhao; Xia, Tongjun; Shi, Yongzhi; Jiang, Zhi‐Qiang; Zhu, Kaigui

doi:10.1016/j.jnucmat.2021.153478

Cited by 10 publications

(4 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The curve tends to be stable and the fluctuation is relatively small. In order to reduce the influence of size effect [17], the depth of the indenter ranged from 400 to 1000 μm, which is similar to our previous work [40]. The average hardness value of LGW is 5.44 GPa, which is smaller than that of SGW (6.52 GPa).…”

Section: Nano-indentation Resultssupporting

confidence: 59%

“…The accumulation and growth of He bubbles lead to the formation of holes [9], blisters [10] nano-structures [11] and fuzz [12,13] etc. These microstructure changes will increase the hydrogen isotope (such as deuterium and tritium) retention in W [14], and accelerate the W surface erosion, which is very detrimental to the safety and stability of plasma facing components [15][16][17].…”

Section: Introductionsmentioning

confidence: 99%

See 1 more Smart Citation

Surface modification and helium release of tungsten irradiated by 40 keV helium ions

Xia,

Jiang,

Shi

et al. 2023

Phys. Scr.

Self Cite

View full text Add to dashboard Cite

The effects of grain boundaries and surface roughness on tungsten irradiated by 40 keV He ions with a flux of 1.6 × 1017 He+/(m2s) to a fluence of 6.6 × 1021 He/m2 at room temperature were investigated. It was found that rough surfaces can suppress the surface blistering on tungsten. This may be due to the grooves appeared on rough tungsten limiting crack growth, resulting in the release of helium. However, the influence of grain boundaries on denseness of blistering was not obvious except the difference in blistering cap. The number of blister with detached cap on large grain tungsten samples (LGW, with the grain size of ~50 µm) is more than that on small grain tungsten samples (SGW, with the grain size of ~5 µm). In addition, the effect of grain boundaries on helium retention in tungsten cannot be ignored. The total He release from SGW was 2.56 × 1021 He/m2, which was smaller than the value (4.10 × 1021 He/m2) of LGW.

show abstract

Section: Nano-indentation Resultssupporting

confidence: 59%

Section: Introductionsmentioning

confidence: 99%

Surface modification and helium release of tungsten irradiated by 40 keV helium ions

Xia,

Jiang,

Shi

et al. 2023

Phys. Scr.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The hardness value reaches a plateau and becomes stable as the indentation depth was greater than 400 nm. In order to reduce the influence of size effect [26], we plotted the dependence of hardness on depth varied from 400 nm to 1000 nm. The selection of this depth is similar to that of our previous work [27].…”

Section: Discussionmentioning

confidence: 99%

Effect of anisotropic grain boundaries on the surface blistering of tungsten induced by deuterium plasma exposure

Xia¹,

Jiang²,

Shi³

et al. 2022

Phys. Scr.

Self Cite

View full text Add to dashboard Cite

The effect of anisotropic grain boundaries on the surface microstructure changes and deuterium retention behavior in tungsten under deuterium plasma irradiation were studied. The samples named as NDW and RDW were cut from RD × TD plane and TD × ND plane of a rolled W plate (ND: normal direction, RD: rolling direction, TD: transverse direction), respectively. The results suggest that both surface morphology and deuterium retention in the RDW samples are suppressed compared to that of NDW samples for 1 h and 25 h deuterium irradiation. For 1 h exposure, the total deuterium retention in the NDW samples is about 1.6 times as much as that of RDW. However, as the exposure time increased to 25 h, the total deuterium retention in the NDW sample is two times the height of RDW sample. The experimental results show that the special grain structure of RDW can alleviate the surface morphology changes and decrease the deuterium retention in tungsten, which is interpreted by the lateral stress model of blistering.

show abstract

“…15 Therefore, the search for more advanced mechanical testing methods had become the focus of scholars when the traditional mechanical tests cannot be satisfied. [16][17][18] Many instruments for nanoscale mechanical testing have been invented, such as atomic mechanics microscope, [19][20][21][22] nanoindentation instrument [23][24][25][26] and scanning probe acoustic microscope. [27][28][29][30] Among them, nanoindentation instrument is widely adopted because of its high resolution and convenient operation.…”

Section: Introductionmentioning

confidence: 99%

Compatibility of high strength silica‐modified microcapsules modified with polydopamine in elastomer substrates

Li,

Wang,

et al. 2023

Polymer Composites

View full text Add to dashboard Cite

Microcapsules with polydopamine composite shell layer were successfully synthesized by functionalizing silica‐modified microcapsules containing isophorone diisocyanate. The components and micromorphology of silica‐modified microcapsules at different reaction periods were studied by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy. The structure of different microcapsules was characterized by FTIR, 1H nuclear magnetic resonance and x‐ray photoelectron spectroscopy. The mechanical performances of different microcapsules were analyzed by nanoindentation technique. The compatibility and self‐healing efficiency of different microcapsules with the substrate were also investigated by the tensile tests. The results showed that the density of the silica‐modified microcapsule shell gradually increased and the mechanical performances were enhanced with the silica source. The hardness and elastic modulus of silica‐modified microcapsules in suitable core fraction (76.5 wt%) were 139.9 MPa and 2.2 GPa, which are 2.3 times and 4.8 times higher than those of untreated microcapsules, respectively. The functionalized modified microcapsules had excellent compatibility with the elastomeric substrate (PU‐PPG2000). At the same time, the self‐healing efficiency of the functionalized modified microcapsules in PU‐PPG2000 was 69.8%, which was 48.9% higher than that of the untreated microcapsules prepared under the same conditions. Silicon modification improved the density of microcapsules, enhancing their mechanical strength. At the same time, functionalization modification improved the interfacial bonding strength of microcapsules, further improving the compatibility with the polymer matrix.Highlights Microcapsules with different silicon sources are characterized. Microcapsules are functionalized with polydopamine. Individual microcapsules are tested for mechanical strength by nanoindentation. The compatibility of the functionalized microcapsules is excellent. The self‐healing efficiency of modified microcapsules is greater than 70%.

show abstract

Effect of He on the hardness and incipient plasticity of W films during nanoindentation

Cited by 10 publications

References 51 publications

Surface modification and helium release of tungsten irradiated by 40 keV helium ions

Surface modification and helium release of tungsten irradiated by 40 keV helium ions

Effect of anisotropic grain boundaries on the surface blistering of tungsten induced by deuterium plasma exposure

Compatibility of high strength silica‐modified microcapsules modified with polydopamine in elastomer substrates

Contact Info

Product

Resources

About