Fragmentation testing for ductile thin films on polymer substrates

Cordill, Megan J.; Marx, Vera Maria

doi:10.1080/09500839.2013.830792

Cited by 38 publications

(32 citation statements)

References 19 publications

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“…[291], in a SEM, e.g. [292], or under an AFM tip [293]. Finally, the stretchability can be directly characterized by the performance which ultimately matters in the application, i.e.…”

Section: Fracture and Fatigue Testing Of Metallic Coatings On Soft Sumentioning

confidence: 99%

Failure of metals III: Fracture and fatigue of nanostructured metallic materials

2016

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a b s t r a c tPushing the internal or external dimensions of metallic alloys down to the nanometer scale gives rise to strong materials, though most often at the expense of a low ductility and a low resistance to cracking, with negative impact on the transfer to engineering applications. These characteristics are observed, with some exceptions, in bulk ultra-fine grained and nanocrystalline metals, nano-twinned metals, thin metallic coatings on substrates and freestanding thin metallic films and nanowires. This overview encompasses all these systems to reveal commonalities in the origins of the lack of ductility and fracture resistance, in factors governing fatigue resistance, and in ways to improve properties. After surveying the various processing methods and key deformation mechanisms, we systematically address the current state of the art in terms of plastic localization, damage, static and fatigue cracking, for three classes of systems: (1) bulk ultra-fine grained and nanocrystalline metals, (2) thin metallic films on substrates, and (3) 1D and 2D freestanding micro and nanoscale systems. In doing so, we aim to favour cross-fertilization between progress made in the fields of mechanics of thin films, nanomechanics, fundamental researches in bulk nanocrystalline metals and metallurgy to impart enhanced resistance to fracture and fatigue in high-strength nanostructured systems. This involves exploiting intrinsic mechanisms, e.g. to enhance hardening and rate-sensitivity so as to delay necking, or improve grain-boundary cohesion to resist intergranular cracks or voids. Extrinsic methods can also be utilized such as by hybridizing the metal with another material to delocalize the deformation -as practiced in stretchable electronics. Fatigue crack initiation is in principle improved by a fine structure, but at the expense of larger fatigue crack growth rates. Extrinsic toughening through hybridization allows arresting or bridging cracks. The content and discussions are based on experimental, theoretical and simulation results from the recent literature, and focus is laid on linking microstructure and physical mechanisms to the overall mechanical behavior.

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“…[291], in a SEM, e.g. [292], or under an AFM tip [293]. Finally, the stretchability can be directly characterized by the performance which ultimately matters in the application, i.e.…”

Section: Fracture and Fatigue Testing Of Metallic Coatings On Soft Sumentioning

confidence: 99%

Failure of metals III: Fracture and fatigue of nanostructured metallic materials

2016

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“…Additionally, the CuTi film was strained in situ under the atomic force microscope (AFM) [25,30–33] to better observe the surface deformation (necking) and crack formation as a function of strain. For this, a miniaturized screw-driven tensile stage was utilized with a 25 μm × 25 μm scan size at 1 Hz and a 512 dpi resolution.…”

Section: Materials/experimentalmentioning

confidence: 99%

Ductile film delamination from compliant substrates using hard overlayers

2014

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Flexible electronic devices call for copper and gold metal films to adhere well to polymer substrates. Measuring the interfacial adhesion of these material systems is often challenging, requiring the formulation of different techniques and models. Presented here is a strategy to induce well defined areas of delamination to measure the adhesion of copper films on polyimide substrates. The technique utilizes a stressed overlayer and tensile straining to cause buckle formation. The described method allows one to examine the effects of thin adhesion layers used to improve the adhesion of flexible systems.

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“…6,7 In order to get a high resolution surface topography of the tested macroscopic samples, AFMs have been used independently of the SEM as ex situ and in situ instruments. [4][5][6][7][8] More recently, AFMs have also been utilized for in situ mechanical testing. For example, deformation analyses and crack propagation with 3-and 4-point bending [9][10][11] and bulge testing, 12,13 as well as buckle delamination and deformation of thin films on polymer substrates, 14,15 have employed AFM to observe and quantify mechanical behavior during discrete deformation steps.…”

Section: Introductionmentioning

confidence: 99%

A versatile atomic force microscope integrated with a scanning electron microscope

Kreith

Strunz²,

Fantner³

et al. 2017

Review of Scientific Instruments

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A versatile atomic force microscope (AFM), which can be installed in a scanning electron microscope (SEM), is introduced. The flexible design of the instrument enables correlated analysis for different experimental configurations, such as AFM imaging directly after nanoindentation in vacuum. In order to demonstrate the capabilities of the specially designed AFM installed inside a SEM, slip steps emanating around nanoindents in single crystalline brass were examined. This example showcases how the combination of AFM and SEM imaging can be utilized for quantitative dislocation analysis through the measurement of the slip step heights without the hindrance of oxide formation. Finally, an in situ nanoindentation technique is introduced, illustrating the use of AFM imaging during indentation experiments to examine plastic deformation occurring under the indenter tip. The mechanical indentation data are correlated to the SEM and AFM images to estimate the number of dislocations emitted to the surface.

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Fragmentation testing for ductile thin films on polymer substrates

Cited by 38 publications

References 19 publications

Failure of metals III: Fracture and fatigue of nanostructured metallic materials

Failure of metals III: Fracture and fatigue of nanostructured metallic materials

Ductile film delamination from compliant substrates using hard overlayers

A versatile atomic force microscope integrated with a scanning electron microscope

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