Interface-enabled defect reduction in He ion irradiated metallic multilayers

Zhang, X.; Fu, Engang; Misra, Amit; Demkowicz, Michael J.

doi:10.1007/s11837-010-0185-5

Cited by 61 publications

(54 citation statements)

References 28 publications

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“…Interactions with point defects determine how an interface influences damage sustained under irradiation [7]. By trapping and accelerating recombination of vacancies and interstitials, interfaces may mitigate radiation-induced degradation phenomena such as hardening and swelling [8,27,35,36]. Interfaces with high free volume have been shown to trap implanted He impurities, thereby delaying bubble formation [36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Structure, shear resistance and interaction with point defects of interfaces in Cu–Nb nanocomposites synthesized by severe plastic deformation

2011

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We use atomistic modeling to investigate the shear resistance and interaction with point defects of a Cu-Nb interface found in nanocomposites synthesized by severe plastic deformation. The shear resistance of this interface is highly anisotropic: in one direction shearing occurs at stresses below 1200MPa while in the other it does not occur at all. The binding energy of vacancies, interstitials, and He impurities to this interface depends sensitively on the binding location, but there is no point defect delocalization nor does this interface contain any constitutional defects. These behaviors are markedly dissimilar from a different Cu-Nb interface found in magnetron sputtered composites. The dissimilarities may, however, be explained by quantitative differences in the detailed structure of these two interfaces.* Corresponding author: demkowicz@mit.edu 617-324-6563 MIT, room 4-142 77 Massachusetts Ave.

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Section: Introductionmentioning

confidence: 99%

Structure, shear resistance and interaction with point defects of interfaces in Cu–Nb nanocomposites synthesized by severe plastic deformation

2011

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“…The density of intrinsic defects at many of these interfaces is high, making it difficult to distinguish individual defects in transmission electron microscopy (TEM). Correlations between the in-plane distribution of He precipitates in these interfaces and the network of intrinsic interfacial defects have therefore been inferred from indirect experiments [6,20,33,[34][35][36] and atomistic modeling [20,37,38]. We have chosen to investigate He bubble distributions at a Cu/V interface because previous calculations revealed that this interface has a highly anisotropic distribution of misfit dislocations and MDIs [39].…”

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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“…Studies have shown that certain multilayer systems may significantly reduce radiation-induced damage in metallic materials [7,34]. Moreover, heterophase interfaces in multilayer systems have also been shown to be effective sinks for radiationinduced defects with respect to grain boundaries [34,37].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, multilayers with enhanced resistance to radiation can be potentially used in nuclear reactors as radiation protective coatings or fuel pin clad [37]. They may also provide additional parameters for materials design, beyond grain size and composition alone, which may be used to obtain properties that are not simultaneously achievable in a single material otherwise [34].…”

Section: Introductionmentioning

confidence: 99%

Role of Interface in Multilayered Composites under Irradiation: A Mathematical Investigation

Ortún-Palacios

Locci

Fadda

et al. 2017

Advances in Materials Science and Engineering

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A continuum model of point-defects evolution during irradiation of a multilayer composite material is presented in this work. Nonstationary balance equations are used to describe production, recombination, transport, and annihilation, or removal, of vacancies and interstitials in a --three-layer system ( = Cu and = Nb, V, or Ni). In addition, transport and trapping of point-defects at interfaces are taken into account. Numerical investigation on similarities and differences between Cu/Nb, Cu/V, and Cu/Ni systems is also performed. A general comparison of model results reveals that average vacancy concentration is typically higher than SIA one in both layers for all the systems investigated. This is a consequence of the higher diffusion rate of SIAs with respect to vacancies. Stationary state is reached without saturating interface point-defect traps by all systems but Cu/Ni for the case of SIAs. It can be also seen that Cu/Nb and Cu/V systems have a very similar behavior regarding point-defect temporal evolution in copper (layer ), while higher SIA concentration at steady state is shown therein by the Cu/Ni structure. Moreover, Cu/V system displays the lower stationary vacancy concentration in layer .

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Interface-enabled defect reduction in He ion irradiated metallic multilayers

Cited by 61 publications

References 28 publications

Structure, shear resistance and interaction with point defects of interfaces in Cu–Nb nanocomposites synthesized by severe plastic deformation

Structure, shear resistance and interaction with point defects of interfaces in Cu–Nb nanocomposites synthesized by severe plastic deformation

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

Role of Interface in Multilayered Composites under Irradiation: A Mathematical Investigation

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