Interface enabled defects reduction in helium ion irradiated Cu/V nanolayers

Fu, Engang; Misra, Amit; Wang, H.; Shao, Lin; Zhang, X.

doi:10.1016/j.jnucmat.2010.10.011

Cited by 197 publications

(142 citation statements)

References 82 publications

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“…NMMs with smaller L presented a higher m, as also observed for Cu/Zr NMMs [36]. The strain rate sensitivity 14 was also plotted against the number of crossed interfaces calculated according to the maximum indentation depth (not shown) and it revealed a sensible increase of m only for L ≤ 12 nm. These observations lead to the conclusion that both relative amount of Nb and interface density distribution have major effects on m.…”

Section: Indentation Creepsupporting

confidence: 56%

Combined size and texture-dependent deformation and strengthening mechanisms in Zr/Nb nano-multilayers

Callisti

Polcar

2017

Acta Materialia

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A combination of transmission electron microscopy analyses and nanomechanical measurements was performed in this study to reveal deformation and strengthening mechanisms occurring in sputtered Zr/Nb nanoscale metallic multilayers (NMMs) with a periodicity (L) in the range 6 -167 nm. Electron diffraction analyses revealed a change in the crystallographic orientation of α-Zr when L ≤ 27 nm, while Nb structure retained the same orientations regardless of L. For L > 60 nm, the strengthening mechanism is well described by the Hall-Petch model, while for 27 < L < 60 nm the refined CLS model comes into picture. A decrease in strength is found for L < 27 nm, which could not be simply explained by considering only misfit and Koehler stresses. For L ≤ 27 nm, plastic strain measured across compressed NMMs revealed a change in the plastic behaviour of α-Zr, which experienced a hard-to-soft transition. At these length scales, the combination of two structural factors were found to affect the strength. These relate to the formation of weaker interfaces which extend the effective distance between strong barriers against dislocation transmission, thus producing a softening effect. 1The second effect relates to the crystallographic orientation change exhibited by α-Zr for L < 27 nm with a consequent change of the dominant slip system. The actual strength at these smaller length scales was effectively quantified by taking these structural aspects into account in the interface barrier strength model.

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Section: Indentation Creepsupporting

confidence: 56%

Combined size and texture-dependent deformation and strengthening mechanisms in Zr/Nb nano-multilayers

Callisti

Polcar

2017

Acta Materialia

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“…Meanwhile the interstitial-rich grain boundaries also reduce the vacancy diffusion barrier so that it is easier for vacancies to migrate to grain boundaries where they recombine with interstitials. Besides high-angle grain boundaries, layer interfaces in certain immiscible metallic multilayers [12][13][14][15] also act as remarkable sinks for point defects, and lead to dramatic reduction of defect density, swelling and radiation hardening. MD simulations showed that Cu/Nb layer interfaces can act as inexhaustible sinks for radiation-induced point defects 16 .…”

mentioning

confidence: 99%

Removal of stacking-fault tetrahedra by twin boundaries in nanotwinned metals

et al. 2013

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Stacking-fault tetrahedra are detrimental defects in neutron-or proton-irradiated structural metals with face-centered cubic structures. Their removal is very challenging and typically requires annealing at very high temperatures, incorporation of interstitials or interaction with mobile dislocations. Here we present an alternative solution to remove stacking-fault tetrahedra discovered during room temperature, in situ Kr ion irradiation of epitaxial nanotwinned Ag with an average twin spacing of B8 nm. A large number of stacking-fault tetrahedra were removed during their interactions with abundant coherent twin boundaries. Consequently the density of stacking-fault tetrahedra in irradiated nanotwinned Ag was much lower than that in its bulk counterpart. Two fundamental interaction mechanisms were identified, and compared with predictions by molecular dynamics simulations. In situ studies also revealed a new phenomenon: radiation-induced frequent migration of coherent and incoherent twin boundaries. Potential migration mechanisms are discussed.

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“…PVD metal multilayers have been used to study the interaction of He with a variety of interfaces, including Cu-Nb [18][19][20][21][22], Cu-V [6,23], Cu-Mo [24], Al-Nb [25] and Fe-W [26]. Recently, studies on He behavior at interfaces in bulk-scale Cu-Nb nanocomposites synthesized by accumulative roll bonding have also been performed [27,28].…”

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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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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Interface enabled defects reduction in helium ion irradiated Cu/V nanolayers

Cited by 197 publications

References 82 publications

Combined size and texture-dependent deformation and strengthening mechanisms in Zr/Nb nano-multilayers

Combined size and texture-dependent deformation and strengthening mechanisms in Zr/Nb nano-multilayers

Removal of stacking-fault tetrahedra by twin boundaries in nanotwinned metals

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

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