Stacking fault and partial dislocation dominated strengthening mechanisms in highly textured Cu/Co multilayers

Liu, Yue; Chen, Y.; Kobayashi, Yu; Wang, H.; Chen, J.; Zhang, X.

doi:10.1016/j.ijplas.2013.03.005

Cited by 117 publications

(47 citation statements)

References 66 publications

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“…Nanoscale metallic multilayers can be fabricated via bottom-up thermodynamic techniques such as physical vapor deposition (Mara et al (2008)) and the electrodeposition of two diff erent metals (Bakonyi and Peter (2010); Yahalom et al (1989)). In recent years, many have studied the grain morphologies, interfacial structures, thermal stability, plastic deformation, and failure mechanisms of metallic multilayers (Bauer and Jh (1986); Wan et al (2012); Misra et al (2004); Wang et al (2009); Liu et al (2013); Wang et al (2008a,b); Li et al (2012a); Abdolrahim et al (2014); ; Kang et al (2007); Hansen et al (2013)). These works were recently reviewed by Zhou et al (2015).…”

Section: Introductionmentioning

confidence: 99%

Shock-induced plasticity in semi-coherent {111} Cu-Ni multilayers

Xiang

Liao

Wang

et al. 2018

International Journal of Plasticity

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Using atomistic simulations, dislocation dynamics modeling, and continuum elastic-plastic stress-wave theory, we present a systematic investigation on shock-induced plasticity in semi-coherent Cu-Ni multilayers. The features of stress-wave evolutions in the multilayers, including wave-front stress attenuation and strong interfacial discontinuities, are revealed by atomistic simulations. Continuum models are proposed to explain the shockwave propagation features. The simulations provide insight into microplasticity behaviors including interactions between lattice and misfit dislocations. The formation of hybrid Lomer-Cottrell locks through the attraction and combination of lattice and misfit dislocations is a major mechanism for trapping gliding lattice dislocations at interfaces. The relationship between dislocation activity and dynamic stress-wave evolution history is explored. The hybrid Lomer-Cottrell locks can dissociate under shock compression or reverse yielding. This dissociation facilitates slip transmission. The influence of coherent stress causes direction dependency in the slip transmission: a lattice dislocation is transmitted more smoothly across an interface from Ni to Cu than from Cu to Ni. The interaction forces between lattice and misfit dislocations are calculated using dislocation dynamics code. Lattice dislocation nucleation from semi-coherent interfaces under shock compression is also reported.

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Section: Introductionmentioning

confidence: 99%

Shock-induced plasticity in semi-coherent {111} Cu-Ni multilayers

Xiang

Liao

Wang

et al. 2018

International Journal of Plasticity

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“…The mechanical strength of C/C (crystalline/crystalline) multilayers can be tailored by varying individual layer thickness and types of layer interfaces (e.g. coherent vs. incoherent) [40][41][42][43][44][45][46], and the strengthening mechanisms in these multilayers have been intensely investigated [47][48][49][50][51][52][53][54]. Comparing with the extensive studies on C/C multilayer films, the studies on mechanical behavior of C/A multilayer films are limited [55][56][57][58][59][60][61][62][63].…”

Section: Introductionmentioning

confidence: 99%

Unusual size dependent strengthening mechanisms of Cu/amorphous CuNb multilayers

et al. 2016

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Nanostructured crystalline/amorphous metallic multilayers have been increasingly studied due to their high strength and potential enhancement of plasticity in amorphous metals.Here we report on mechanical behaviors of Cu/amorphous CuNb multilayers that were prepared by magnetron sputtering with equal individual layer thickness (h) varying from 1 to 200 nm. A medium-range-order amorphous CuNb layer formed between Cu and amorphous CuNb layers. This intermediate layer facilitates transmission of plasticity from Cu to amorphous layers by preventing the smear of dislocation core on the interface. The maximum hardness of Cu/amorphous CuNb multilayers is achieved when h ≤ 50 nm, and is much lower than the hardness of single-layer amorphous CuNb films. Molecular dynamics simulations show that, comparing with single-layer amorphous CuNb, the pile-up of dislocations in Cu layers lowered the stress for the activation of shear transformation zones in amorphous CuNb layers in multilayers.

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“…The strength of NMMs in this case is affected by different factors including the Koehler stress [28][29][30], misfit dislocations [24,28], chemical stress [28,31,32], coherency stress [28,33] and twinning [23,24,34,35,36].…”

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confidence: 99%

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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Stacking fault and partial dislocation dominated strengthening mechanisms in highly textured Cu/Co multilayers

Cited by 117 publications

References 66 publications

Shock-induced plasticity in semi-coherent {111} Cu-Ni multilayers

Shock-induced plasticity in semi-coherent {111} Cu-Ni multilayers

Unusual size dependent strengthening mechanisms of Cu/amorphous CuNb multilayers

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

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