Suppression of irradiation hardening in nanoscale V/Ag multilayers

Wei, Qiangmin; Li, Nan; Mara, Nathan A.; Nastasi, M.; Misra, Amit

doi:10.1016/j.actamat.2011.06.043

Cited by 170 publications

(108 citation statements)

References 54 publications

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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 .…”

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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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confidence: 99%

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

et al. 2013

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“…It has a mean of ∼ 0.6 nm. Because of the Fresnel contrast of the bubbles at the 400 nm under-focus condition, these values may overestimate the true radius by as much as ∼ 20% [43]. Figure 5(b) plots pair distribution functions as a function of distance between bubbles computed using three different bin numbers.…”

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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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“…[22] Defect density and irradiation-induced hardening in these systems show a strong size dependence on individual layer thickness (h), that is the magnitude of irradiation hardening and defect density both decrease at smaller h in immiscible nanolaminates. Fu et al first showed prominent simultaneous reduction of irradiation hardening and He bubble density in the He ion-irradiated Cu/V system when h is smaller [16]; similar phenomena were later observed in several other systems, such as Ag/Ni, [19] Ag/V [20] and Fe/W. [22] Molecular dynamics simulations [23] pointed out that layer interfaces can act as effective defect sinks for irradiationinduced point defects.…”

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confidence: 99%

“…[4,5] Consisting of two or more nanostructured heterophases, metallic nanolaminates exhibit not only excellent mechanical strength [6][7][8][9] and fatigue resistance, [10] but also impressive tolerance to ion irradiation. [11][12][13] He ion irradiation studies have been extensively reported in immiscible nanolaminates such as Cu/V, [14][15][16] Cu/Nb, [11] Cu/W, [17] Cu/Mo, [18] Ag/Ni [19] and Ag/V [20] and miscible Al/Nb [21] and Fe/W. [22] Defect density and irradiation-induced hardening in these systems show a strong size dependence on individual layer thickness (h), that is the magnitude of irradiation hardening and defect density both decrease at smaller h in immiscible nanolaminates.…”

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confidence: 99%