Length scale-dependent deformation behavior of nanolayered Cu/Zr micropillars

Zhang, J.Y.; Sun, Lei; Liu, Y.; Niu, Jitai; Chen, Youxing; Liu, G.; Zhang, X.; Sun, Jun

doi:10.1016/j.actamat.2011.12.001

Cited by 118 publications

(37 citation statements)

References 89 publications

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“…Such tendency matches well with that exhibited by the hardness (Fig. 6a) NMMs in relation to hCu/L [48]. The activation volume decreases from ~ 9.4b 3 to ~ 3b 3 for larger hNb/L, as also reported for Cu/Zr NMMs for similar length scales [73], although an exception is found for the film with hNb = 11 nm (or L = 27 nm).…”

Section: Indentation Creepsupporting

confidence: 88%

“…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.…”

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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: Indentation Creepsupporting

confidence: 88%

mentioning

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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“…This section focuses on nanoscale metallic multilayer thin films with h < 50 nm. Techniques to measure yield strength and hardness include microindentation [135], nanoindentation [157][158][159][160][161][162][163][164][165][166], tensile testing [167][168][169], and micropillar compression testing [112,113,164,[170][171][172]. However, these techniques focus on the composite yield strength.…”

Section: Mechanical Propertiesmentioning

confidence: 98%

Mechanical Properties of Nanostructured Metals

Anderson

Carpenter

Gram

et al. 2014

Handbook of Nanomaterials Properties

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PolycrystalsThis section is divided into four subsections. The subsection on synthesis and structure treats electrodeposition, severe plastic deformation, and mechanical alloying. It highlights features that affect mechanical properties such as texture, grain size and shape, internal stress, twinning, dislocations, and point defects. The mechanical properties subsection contrasts yield strength, ductility, strain hardening, strain-rate sensitivity, creep, and fatigue in conventional versus nanocrystalline metals. Underlying deformation mechanisms are then discussed in terms of deformation-mechanism maps and intragranular slip versus grain-boundarymediated regimes. Finally, modeling and simulation approaches are presented in terms of atomistic versus continuum methods.

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“…Examples include nanoindenation, [1][2][3] micropillar compression, [4][5][6] and tensile testing. [7][8][9] Yet, a better understanding of the constituents-particularly in confined geometries-is needed to foster intelligent multilayer design.…”

Section: Abstract: Nanolaminates X-ray Diffraction Interface Propermentioning

confidence: 99%

X-Ray Diffraction Studies of Forward and Reverse Plastic Flow in Nanoscale Layers During Thermal Cycling

Gram

Carpenter

Payzant

et al. 2013

Materials Research Letters

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Length scale-dependent deformation behavior of nanolayered Cu/Zr micropillars

Cited by 118 publications

References 89 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

Mechanical Properties of Nanostructured Metals

X-Ray Diffraction Studies of Forward and Reverse Plastic Flow in Nanoscale Layers During Thermal Cycling

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