Tunable helium bubble superlattice ordered by screw dislocation network

Di, Zengfeng; Bai, Xian-Ming; Wei, Qiangmin; Won, Jonghan; Hoagland, R. G.; Wang, Yongqiang; Misra, Amit; Uberuaga, Blas P.; Nastasi, M.

doi:10.1103/physrevb.84.052101

Cited by 59 publications

(40 citation statements)

References 18 publications

(13 reference statements)

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“…If so, then the present observations would be the first time such an ordered He distribution pattern has been directly imaged at a fcc/bcc interface. He bubble networks on misfit dislocation intersections have been observed previously at low-angle twist GBs in Au [32]. At present, we cannot exclude the possibility that the pattern in Figure 6 may have formed along a different kind of defect structure, e.g.…”

Section: Resultsmentioning

confidence: 72%

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Imaging the in-plane distribution of helium precipitates at a Cu/V interface

Chen

Yuryev

et al. 2017

Materials Research Letters

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We describe a transmission electron microscopy investigation of the distribution of helium precipitates within the plane of an interface between Cu and V. Statistical analysis of precipitate locations reveals a weak tendency for interfacial precipitates to align along 110 -type crystallographic directions within the Cu layer. Comparison of these findings with helium-free Cu/V interfaces suggests that the precipitates may be aggregating preferentially along atomic-size steps in the interface created by threading dislocations in the Cu layer. Our observations also suggest that some precipitates may be aggregating along intersections between interfacial misfit dislocations. IMPACT STATEMENTThe innovation of this paper is providing the first plane-view experimental images of in-plane helium precipitate distributions at an interface between physical vapor deposited face-centered cubic (fcc) and body-centered cubic (bcc) metals. ARTICLE HISTORY

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Section: Resultsmentioning

confidence: 72%

“…its orientation relation and interface plane orientation [29][30][31]. For example, previous experiments have found that He bubbles preferentially occupy misfit dislocations intersections (MDIs) [32] on low-angle twist grain boundaries (GBs) in gold (Au).…”

Section: Introductionmentioning

confidence: 99%

Imaging the in-plane distribution of helium precipitates at a Cu/V interface

Chen

Yuryev

et al. 2017

Materials Research Letters

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“…These results demonstrate good stability of crystalline Fe/amorphous SiOC interface and room temperature radiation stability in the Fe/SiOC composite system. Besides grain boundaries in the Fe layers, the crystalline/amorphous interfaces in the Fe/SiOC composite films are anticipated to be regions of high free volume and are able to adopt numerous atomic-level configurations [9,20,21]. Therefore, these crystalline/amorphous interfaces can act as highly efficient defect sinks to enhance point-defect recombination, as observed in the present study.…”

Section: Resultsmentioning

confidence: 74%

Irradiation tolerance of amorphous SiOC/crystalline Fe composite

Price

Santana

et al. 2015

Materials Letters

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a b s t r a c tWe examined the radiation tolerance of amorphous silicon oxycarbide (SiOC) and crystalline Fe composite by using ion irradiation and transmission electron microscopy (TEM). The Fe/SiOC multilayer thin films were grown via magnetron sputtering with controlled length scale on a surface oxidized Si (100) substrate. These alloys were irradiated by 120 keV He þ ions to a damage level of $ 1.3 displacements per atom (dpa) at room temperature. TEM characterization shows neither sign of point defect clusters in Fe layer, nor an indication of crystallization or new phase formation in SiOC layer. Our findings suggest that the crystalline/amorphous interface and Fe grain boundary can help to annihilate point defects generated during irradiation, and therefore enhance radiation tolerance properties.

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“…It was shown that a 1/2 h1 1 1i dislocation loop is formed as a sequential collection of h1 1 1i crowdions, the latter being the most stable self-interstitial atom configuration in the presence of an over-pressurised He cluster. Di et al [13] found that helium bubbles in Au preferentially nucleate at screw dislocation nodal points and result in helium bubble superlattice formation, which is completely isomorphic with the screw dislocation network along the twist-grain boundary. Stoller and coworkers [14,15] developed a three body He-Fe potential and investigated the pressure and compressibility for He-vacancy clusters.…”

Section: Introductionmentioning

confidence: 98%

Helium bubbles in bcc Fe and their interactions with irradiation

Gai

Lazauskas

Smith

et al. 2015

Journal of Nuclear Materials

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a b s t r a c tThe properties of helium bubbles in a body-centred cubic (bcc) Fe lattice have been examined. The atomic configurations and formation energies of different He-vacancy complexes were determined. The 0 K results show that the most energetically favourable He to Fe vacancy ratio increases from about 1:1 for approximately 5 vacancies up to about 4:1 for 36 vacancies. The formation mechanisms for small He clusters have also been considered. Isolated interstitials and small clusters can diffuse quickly through the lattice. MD simulations of randomly placed interstitial He atoms at 500 K showed clustering over the time scale of nanoseconds with He clusters containing up to 4 atoms being mobile over this time scale. He clusters containing 4 or 5 atoms were shown to eject an Fe dumbbell interstitial which could then detach from the He cluster and diffuse with the remaining He-vacancy complex being effectively immobile. Collision cascades initiated near larger bubbles showed that Fe vacancies produced by the cascades readily become part of the He-vacancy complexes. Energy barriers for He to join an existing bubble as a function of the He-vacancy ratio are also calculated. These can be larger than the diffusion barrier in the pristine lattice, but are lower when the bubbles contain excess vacancies, thus indicating that bubble growth may be kinetically constrained.

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Tunable helium bubble superlattice ordered by screw dislocation network

Cited by 59 publications

References 18 publications

Imaging the in-plane distribution of helium precipitates at a Cu/V interface

Imaging the in-plane distribution of helium precipitates at a Cu/V interface

Irradiation tolerance of amorphous SiOC/crystalline Fe composite

Helium bubbles in bcc Fe and their interactions with irradiation

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