Investigation of deformation instability of Au/Cu multilayers by indentation

“…However, the multilayer nanocomposites have very limited uniform deformability due to the formation of localized shear bands. Three modes of shear banding have been reported, including dislocation cutting through the interface [5,12], sliding of columnar grains [13,14] and localized rotation of interfaces that are weak in shear [7,8]. Since the slip directions may be aligned in a multilayer system, the shear bands tend to propagate across the entire thickness of the thin film, resulting in premature failure.…”

Section: Introductionmentioning

confidence: 99%

Suppression of shear banding in high-strength Cu/Mo nanocomposites with hierarchical bicontinuous intertwined structures

Cui

Derby

et al. 2018

Materials Research Letters

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The microstructures and mechanical behavior of high-temperature co-sputtered Cu/Mo nanocomposites were investigated and compared with Cu/Mo multilayers. The co-sputtered nanocomposites present hierarchical architectures with bicontinuous intertwined Cu/Mo phases, the feature size of which can be tuned from 35 to 3 nm by changing the deposition parameters. After indentation, shear bands were found in the multilayers but not in the hierarchical nanocomposites. In situ nanocompression tests in Transmission electron microscopy showed that the hierarchical nanocomposite containing fine-length-scale intertwined Cu/Mo phases has very high strength. The hierarchical structure is proposed to play an important role in suppressing shear band formation. IMPACT STATEMENTCu/Mo nanocomposites with novel hierarchical architecture containing bicontinuous intertwined structures were fabricated through co-sputtering. High strength and good deformability were achieved in the nanocomposites through in situ nanomechanical testing.

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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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Investigation of deformation instability of Au/Cu multilayers by indentation

Cited by 67 publications

References 44 publications

Size effect on mechanical behavior of Al/Si3N4 multilayers by nanoindentation

Size effect on mechanical behavior of Al/Si3N4 multilayers by nanoindentation

Suppression of shear banding in high-strength Cu/Mo nanocomposites with hierarchical bicontinuous intertwined structures

Mechanical Properties of Nanostructured Metals

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