Stability of interfaces in a multilayered Ag–Cu composite during cold rolling

Tian, Yanzhong; Zhang, Z.F.

doi:10.1016/j.scriptamat.2012.12.014

Cited by 28 publications

(29 citation statements)

References 27 publications

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“…Examples of commonly observed {111} semi-coherent interfaces in fcc metals include twist grain boundaries or twist/un-twist interphase boundaries. These boundaries have a low formation energy and hence, high thermal stability161718. It seems well understood that such interfaces contain three sets of dislocations ( a /2<110> or a /6<112>), depending on the stacking fault energy19202122.…”

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confidence: 99%

Spiral Patterns of Dislocations at Nodes in (111) Semi-coherent FCC Interfaces

Shao

Wang

Misra

et al. 2013

Sci Rep

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In semi-coherent interface, a superposed network of interface dislocations accommodates the attendant coherency strains in the adjacent crystals and their intersections (referred to as nodes) can act as sinks and sources for point defects because of the low formation energy. Nodes in {111} semi-coherent interfaces are characterized with a spiral pattern (SP), wherein the line direction of each dislocation entering a node curves. The structure of SP nodes is able to switch between condensed and expanded by either reaction with point defects or mechanical deformation. Due to the switching of the node structures, point defect formation energies at nodes can be significantly reduced. Combining atomistic simulation and dislocation theory, these features are proven universal corresponding to the node density and the character of interface dislocations.

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confidence: 99%

Spiral Patterns of Dislocations at Nodes in (111) Semi-coherent FCC Interfaces

Shao

Wang

Misra

et al. 2013

Sci Rep

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“…Deformation twins in Cu were observed to extend for a few microns, which is an order of magnitude larger than the 250-350 nm reported in previous studies [17,18]. The occurrence of these deformation twins in Cu across layers microns wide is in contrast to the Cu-Nb system in which deformation twinning occurs in layers less than or equal to 80 nm thick [24].…”

Section: Discussionmentioning

confidence: 68%

“…Twinning in Cu has also been reported to occur in Ag-Cu alloys in regions with a cube-on-cube orientation relationship between the phases with 111 ð Þ Ag jj 111 ð Þ Cu interfaces with crystallographic directions ½110 Ag jj½110 Cu and ½112 Ag jj½112 Cu aligned in the interface plane at high strains, greater than 52.9% rolling reductions, for layer thicknesses less than 350 nm [17][18][19]. This response has been attributed to direct transmission of twinning partial dislocations from Ag through the interface into Cu [17,18].…”

Section: Introductionmentioning

confidence: 99%

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Anomalous deformation twinning in coarse-grained Cu in Ag60Cu40 composites under high strain-rate compressive loading

Eftink

Mara

Kingstedt

et al. 2014

Materials Science and Engineering: A

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a b s t r a c tThe deformation response of a directionally solidified Ag 60 Cu 40 eutectic alloy with a cube-on-cube orientation relationship between Ag and Cu subjected to high strain-rate 10 3 s À 1 compressive loading was examined. Loading at 451 and 901 to the growth axis, near 001 ½ and ½111 local crystal orientations, respectively, resulted in deformation twinning and dislocation slip in both Ag and Cu under conditions where deformation twinning would not normally be expected in Cu. In contrast, loading at 01 and 901 to the growth axis, near 101 h i local crystal orientations, resulted in the primary deformation mode being dislocation slip. These results are interpreted in terms of the influence of loading axis with respect to the local crystal orientation in the directionally solidified alloy and on slip transmission from Ag into Cu.

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“…1. Shear banding reflects the plastic instability of multilayer systems subjected to deformation and it has been observed as inhomogeneously aligned lamella structures in the accumulative roll bonding processed systems such as Ag/Cu, 43,44 Cu/Zr, 43 Cu/Ni, 45 Al/ Cu, 46 and Al alloys. 47,48 It is seen in Fig.…”

Section: Resultsmentioning

confidence: 99%

Intermixing in Cu/Ni multilayers induced by cold rolling

Wang

Perepezko

Larson

et al. 2015

Journal of Applied Physics

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Repeated cold rolling was performed on multilayers of Cu60/Ni40 and Cu40/Ni60 foil arrays to study the details of driven atomic scale interfacial mixing. With increasing deformation, there is a significant layer refinement down to the nm level that leads to the formation of a solid solution phase from the elemental end members. Intriguingly, the composition of the solid solution is revealed by an oscillation in the composition profile across the multilayers, which is different from the smoothly varying profile due to thermally activated diffusion. During the reaction, Cu mixed into Ni preferentially compared to Ni mixing into Cu, which is also in contrast to the thermal diffusion behavior. This is confirmed by observations from X-ray diffraction, electron energy loss spectrum and atom probe tomography. The diffusion coefficient induced by cold rolling is estimated as 1.7 Â 10 À17 m 2 /s, which cannot be attributed to any thermal effect. The effective temperature due to the deformation induced mixing is estimated as 1093 K and an intrinsic diffusivity d b , which quantifies the tendency towards equilibrium in the absence of thermal diffusion, is estimated as 6.38 Â 10 À18 m 2 /s. The fraction of the solid solution phase formed is illustrated by examining the layer thickness distribution and is described by using an error function representation. The evolution of mixing in the solid solution phase is described by a simplified sinusoid model, in which the amplitude decays with increased deformation level. The promoted diffusion coefficient could be related to the effective temperature concept, but the establishment of an oscillation in the composition profile is a characteristic behavior that develops due to deformation. V C 2015 AIP Publishing LLC. [http://dx.

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Stability of interfaces in a multilayered Ag–Cu composite during cold rolling

Cited by 28 publications

References 27 publications

Spiral Patterns of Dislocations at Nodes in (111) Semi-coherent FCC Interfaces

Spiral Patterns of Dislocations at Nodes in (111) Semi-coherent FCC Interfaces

Anomalous deformation twinning in coarse-grained Cu in Ag60Cu40 composites under high strain-rate compressive loading

Intermixing in Cu/Ni multilayers induced by cold rolling

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