Challenges and interesting observations associated with feedback-controlled nanoindentation

Warren, Oden L.; Downs, Seth A.; Wyrobek, Thomas J.

doi:10.3139/146.017951

Cited by 47 publications

(48 citation statements)

References 22 publications

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“…As has been shown previously, the displacementcontrol mode tends to be more sensitive to discrete events 10 as indicated by the clear load drops in Fig. 3(a).…”

Section: B In Situ Nanoindentationmentioning

confidence: 55%

In situ mechanical observations during nanoindentation inside a high-resolution scanning electron microscope

et al. 2008

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In nanoindentation, the occurrence of cracks, pileup, sink-in, or film delamination adds additional complexity to the analysis of the load-displacement curves. Many techniques and analysis methods have been used to extract both qualitative and quantitative information from the indentation test both during and after the test. Much of this information is obtained indirectly or may even be overlooked by current testing methods (e.g., cracks that open only during the loading cycle of the test may go unnoticed from a typical residual indentation analysis). Here we report on the development of a miniature depth-sensing nanoindentation instrument and its integration into a high-resolution scanning electron microscope. Real-time observation of the nanoindentation test via scanning electron microscopy allows for visualization and detection of certain events such as crack initiation, pileup, or sink-in, and other material deformation phenomena. Initial results from aluminum 〈100〉 and a thin gold film (∼225 nm) are presented.

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“…As has been shown previously, the displacementcontrol mode tends to be more sensitive to discrete events 10 as indicated by the clear load drops in Fig. 3(a).…”

Section: B In Situ Nanoindentationmentioning

confidence: 55%

In situ mechanical observations during nanoindentation inside a high-resolution scanning electron microscope

et al. 2008

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“…A discussion on the stiffness, the instrumental assembly, and different deformation modes of the nanoindenter used in this study is presented in detail in Ref. [29].…”

Section: Resultsmentioning

confidence: 99%

“…Considering the sample and machine as two serial springs, where the axial transducer stiffness is ∼10 2 N/m, and the sample has an axial stiffness of ∼11 000 N/m, it is clear that the dominant contribution to the apparent stiffness for the strain-driven data originates from the much more compliant transducer. The effective F − S slope in strain-driven deformation amounts to ∼1700 N/m, which only can be understood when considering the efficient and fast (78 kHz) feedback loop of the device, artificially stiffening the system [29]. For stress-driven testing the assumption of two springs in series does not apply.…”

Section: Model Assumptions and Experimental Detailsmentioning

confidence: 99%

“…The crystals were compressed in a Hysitron nanoindenter either using a strain-driven (displacement controlled, equivalent to hard) or a stress-driven (force controlled, equivalent to soft) deformation mode [29]. In the following, displacement represents the platen position during loading, and by "force" we mean the value applied by the device onto the crystal.…”

Section: Model Assumptions and Experimental Detailsmentioning

confidence: 99%

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Slip statistics of dislocation avalanches under different loading modes

et al. 2015

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Slowly compressed microcrystals deform via intermittent slip events, observed as displacement jumps or stress drops. Experiments often use one of two loading modes: an increasing applied stress (stress driven, soft), or a constant strain rate (strain driven, hard). In this work we experimentally test the influence of the deformation loading conditions on the scaling behavior of slip events. It is found that these common deformation modes strongly affect time series properties, but not the scaling behavior of the slip statistics when analyzed with a mean-field model. With increasing plastic strain, the slip events are found to be smaller and more frequent when strain driven, and the slip-size distributions obtained for both drives collapse onto the same scaling function with the same exponents. The experimental results agree with the predictions of the used mean-field model, linking the slip behavior under different loading modes.

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“…Pop-in, alternatively referred to as the yield point, marks the onset of plasticity in defectfree crystals [17][18][19]. For load controlled experiments, pop-in appears as rapid displacement increase whereas its incidence under displacement control is evident as a load drop [20].…”

Section: Resultsmentioning

confidence: 99%

Influence of Phase Transformations on Incipient Plasticity of Si-Nanospheres

Chrobak

Nowak

2017

Acta Phys. Pol. A

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Our finding of the current spike effect highlighted for the first time in 2009 offers an enhanced understanding of the link between nanoscale mechanical deformation and electrical behavior, and ultimately suggests key advances in unique phase-change applications in future electronics. Certainly, crystal imperfections affect the properties of the nanoparticles themselves, e.g., their biocompatibility and biodegradability. The potential role of dislocations having a profound impact on the use of Si nanoparticles was largely overlooked, since plastic deformation of bulk Si is dominated by amorphization and phase transformations. Here we show an effect of bulk → nanoparticle transition (deconfinement) on incipient plasticity of Si-nanovolume. Our results provide a fresh insight into the dilemma concerning dislocation or phase transformation origin of nanoscale plastic deformation of semiconductor nanoobjects.

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Challenges and interesting observations associated with feedback-controlled nanoindentation

Cited by 47 publications

References 22 publications

In situ mechanical observations during nanoindentation inside a high-resolution scanning electron microscope

In situ mechanical observations during nanoindentation inside a high-resolution scanning electron microscope

Slip statistics of dislocation avalanches under different loading modes

Influence of Phase Transformations on Incipient Plasticity of Si-Nanospheres

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