Length-scale-dependent deformation and fracture behavior of Cu/X (X=Nb, Zr) multilayers: The constraining effects of the ductile phase on the brittle phase

Zhang, J.Y.; Zhang, X.; Wang, R.H.; Sun, Lei; Zhang, P.; Niu, Jitai; Liu, G.; Zhang, G.J.; Sun, Jun

doi:10.1016/j.actamat.2011.08.016

Cited by 152 publications

(58 citation statements)

References 39 publications

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“…7 some minor variations in strength for L ≤ 27 nm are observed. Zhang et al [47] proposed another possible mechanism to describe the length-independent strength of multilayers composed of softer/ductile layers and harder/brittle layers for small h. This mechanism is known as load-bearing effect, where co-deformation of both constituent layers occurs instead of a preferential deformation. Following this model, Zr and Nb layers could be seen as two layers with similar mechanical properties, therefore the resulting strength might be expressed again by the ROM.…”

Section: Strengthening Mechanismsmentioning

confidence: 99%

“…By using the yield strength of constrained Zr and Nb monolithic layers of 1.6 GPa and 1.25 GPa, respectively [47], for . These simple calculations lead to the conclusion that different strengthening mechanisms take place on different length scales.…”

Section: Strengthening Mechanismsmentioning

confidence: 99%

“…Only recently, cubic/hcp systems started to attract some attention among the scientific community. NMM systems combining bcc/hcp (Mg/Nb [43], Co/Mo [44]), fcc/hcp (Cu/Ta [45], Cu/Zr [46][47][48][49]) and hcp/hcp (Mg/Ti [20]) were studied. In the latter case, no strength plateau was found and the strength kept increasing for smaller h (~ 2.5 nm), while for larger h the models mentioned above were successfully used to describe the strength vs h relationship.…”

mentioning

confidence: 99%

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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: Strengthening Mechanismsmentioning

confidence: 99%

Section: Strengthening Mechanismsmentioning

confidence: 99%

mentioning

confidence: 99%

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

Callisti

Polcar

2017

Acta Materialia

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“…For comparison, Fig. 6(b) shows the g-dependent e cri of a Cu/X series (X = Zr, Cr, and Nb) of crystalline/crystalline nanolaminates (C/C NLs) [27,28]. In general, the Cu-based C/C NLs have their e cri monotonically increase with reducing g, considerably different from the C/A NLs.…”

Section: Ductility and Fracture Modes Of Cu/cu-zr C/a Nls And Cu-zr Amentioning

confidence: 96%

Size- and constituent-dependent deformation mechanisms and strain rate sensitivity in nanolaminated crystalline Cu/amorphous Cu–Zr films

et al. 2015

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“…[1][2][3] Experimental, theoretical, and modeling studies on metallic multilayers have suggested that the enhancement of mechanical properties arises from the structure and attributes of interfaces and layers. 4,5 However, because of the high grain boundary (interface)-to-volume ratio, the nanostructure is unstable when exposed to elevated temperatures. For example, Cu/Nb nanolaminates fabricated by physical vapor deposition (PVD) have an in-plane grain size-to-thickness ratio (aspectratio) of $1-1.3 for both Cu and Nb.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Evolution of Interface Morphologies in Metallic Layered Composites

Shen

2015

JOM

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During high-temperature annealing of accumulatively roll-bonded metallic multilayers, long straight interfaces between immiscible constituents (e.g., Cu/Nb) have been observed to evolve into a wavy shape consisting of corners and facets. To understand the underlying mechanism of such a critical phenomenon, we developed a mesoscale thermodynamic model to simulate the evolution of interface morphology. In the model, we have considered both the anisotropy of interfacial energy and the corner energy that is pertinent to the formation of facets and interfacial dislocation accumulation. Our simulation results indicate that the interface prefers to be faceted, which is in excellent agreement with the experimental observation.

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Length-scale-dependent deformation and fracture behavior of Cu/X (X=Nb, Zr) multilayers: The constraining effects of the ductile phase on the brittle phase

Cited by 152 publications

References 39 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

Size- and constituent-dependent deformation mechanisms and strain rate sensitivity in nanolaminated crystalline Cu/amorphous Cu–Zr films

Modeling the Evolution of Interface Morphologies in Metallic Layered Composites

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