A Review on the Radiation Response of Nanoporous Metallic Materials

Li, Jin; Wang, H.; Zhang, Xinghang

doi:10.1007/s11837-018-3111-x

Cited by 15 publications

(15 citation statements)

References 72 publications

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“…Although radiation damage has been studied extensively in bulk, much remains to be understood in nanostructured materials [26][27][28][29]. Theoretical and applied interests in nanomaterials are growing due to the extraordinary properties arising at the nanoscale.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, irradiation of nanostructures has been shown to affect mechanical properties [30][31][32]. Among nanostructured materials, nanoporous foams display radiation-resistance properties due to their large surface-tovolume ratio which leads to surface defect sinks [29,33]. Noble-metal nanofoams, mostly Au and Ag, have been extensively studied [29,33], but nanofoams with bodycentered cubic (bcc) structure remain mostly unexplored.…”

Section: Introductionmentioning

confidence: 99%

“…Among nanostructured materials, nanoporous foams display radiation-resistance properties due to their large surface-tovolume ratio which leads to surface defect sinks [29,33]. Noble-metal nanofoams, mostly Au and Ag, have been extensively studied [29,33], but nanofoams with bodycentered cubic (bcc) structure remain mostly unexplored. W fuzz generated in fusion reactors is expected to take heat loads that would crack bulk tungsten [34,35], and its radiation damage must be studied [36].…”

Section: Introductionmentioning

confidence: 99%

“…However, experiments on individual nanowires typically deal with much larger aspect ratios. NWs are interesting per se, because they exhibit an important dependence of properties such as plasticity [45] or irradiationinduced defects [29,46] on size. For example, the in situ ion irradiation study by Sun et al [47] revealed nearly defect-free ZnO NWs for diameters of 30 nm or less.…”

Section: Introductionmentioning

confidence: 99%

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Electronic heat transport versus atomic heating in irradiated short metallic nanowires

et al. 2019

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The two-temperature model (TTM) is commonly used to represent the energy exchange between atoms and electrons in materials under irradiation. In this work we use the TTM coupled to molecular dynamics (TTM-MD) to study swift heavy ion irradiation of Au and W finite nanowires. While no permanent structural modifications are observed in bulk, nanowires behave in a different way depending on thermal conductivity and the electronphonon coupling parameter. Au is a good heat conductor and it does not transfer energy from electrons to phonons too efficiently. Therefore, energy is quickly carried away from the track so that both electronic and lattice temperatures remain quite uniform across the sample at all times. W has a lower thermal conductivity and a larger electron-phonon coupling, thus supporting an inhomogeneous lattice temperature profile with temperatures well above melting lasting several picoseconds in the irradiated region. Both W and Au nanowires display radiation-induced surface roughening. However, in the case of W there is also sputtering and the formation of a hole in the central part of the wire, purely due to the energy transferred to the atoms by the electrons. The physical mechanisms underlying these findings are rationalized in terms of a combination of sputtering, vacancy formation, and melt flow phenomena. The role of the electron-phonon coupling parameter g is analyzed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electronic heat transport versus atomic heating in irradiated short metallic nanowires

et al. 2019

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“…During ion irradiation as a means to simulate reactor conditions, the incident particles interact with the atoms of the target material creating displaced atoms which can aggregate in the form of point defect clusters that can grow to form extended defects such as dislocation loops [10,11]. As a result of neutron-induced (n,α) reactions, helium (He) is generated and is insoluble in most solids including W [12].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Radiation Tolerance of Tungsten Nanoparticles to He Ion Irradiation

et al. 2018

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Materials exposed to plasmas in magnetic confinement nuclear reactors will accumulate radiation-induced defects and energetically implanted gas atoms (from the plasma and transmutations), of which insoluble helium (He) is likely to be the most problematic. The large surface-area-to-volume ratio exhibited by nanoporous materials provides an unsaturable sink with the potential to continuously remove both point defects and He. This property enhances the possibilities for these materials to be tailored for high radiation-damage resistance. In order to explore the potential effect of this on the individual ligaments of nanoporous materials, we present results on the response of tungsten (W) nanoparticles (NPs) to 15 keV He ion irradiation. Tungsten foils and various sizes of NPs were ion irradiated concurrently and imaged in-situ via transmission electron microscopy at 750 °C. Helium bubbles were not observed in NPs with diameters less than 20 nm but did form in larger NPs and the foils. No dislocation loops or black spot damage were observed in any NPs up to 100 nm in diameter but were found to accumulate in the W foils. These results indicate that a nanoporous material, particularly one made up of ligaments with characteristic dimensions of 30 nm or less, is likely to exhibit significant resistance to He accumulation and structural damage and, therefore, be highly tolerant to radiation.

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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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A Review on the Radiation Response of Nanoporous Metallic Materials

Cited by 15 publications

References 72 publications

Electronic heat transport versus atomic heating in irradiated short metallic nanowires

Electronic heat transport versus atomic heating in irradiated short metallic nanowires

Enhanced Radiation Tolerance of Tungsten Nanoparticles to He Ion Irradiation

Review on helium behaviors in nanochannel tungsten film

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