Evidence for universal intermittent crystal plasticity from acoustic emission and high-resolution extensometry experiments

Weiss, Jérôme; Richeton, Thiebaud; Louchet, F.; Chmelı́k, František; Dobroň, Patrik; Entemeyer, Denis; Lebyodkin, M.A.; Lebedkina, Tatiana; Fressengeas, Claude; McDonald, Russell J.

doi:10.1103/physrevb.76.224110

Cited by 126 publications

(104 citation statements)

References 28 publications

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“…Under certain conditions, it is argued that the maximum amplitude A m is a measure of the area swept by the fastmoving dislocations [14,15]. The same power law exponent for the maximum velocity distribution has been observed using high-resolution extensometry [17].…”

Section: Introductionmentioning

confidence: 69%

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Universal fluctuations and extreme statistics of avalanches near the depinning transition

et al. 2013

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We derive exact predictions for universal scaling exponents and scaling functions associated with the statistics of maximum velocities vm during avalanches described by the mean field theory of the interface depinning transition. In particular, we find a robust power-law regime in the statistics of maximum events that can explain the observed distribution of the peak amplitudes in acoustic emission experiments of crystal plasticity. Our results are expected to be broadly applicable to a broad range of systems in the mean-field interface depinning universality class, ranging from magnets to earthquakes.

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Section: Introductionmentioning

confidence: 69%

“…Crystal plasticity as a critical phenomenon has also been confirmed by other experimental techniques such as highresolution extensometry [17] and compression of nanopillars and micro-pillars [19,20], as well as by numerical simulations of discrete dislocation dynamics [7,[21][22][23]. Moreover, the statistics of slip avalanches-i.e.…”

Section: Introductionmentioning

confidence: 69%

Universal fluctuations and extreme statistics of avalanches near the depinning transition

et al. 2013

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“…Yet another example of a discretely evolving system is a plastically flowing crystal, where the underlying dislocation structure reorganizes from one critical state to another. While early stress-strain evidence exists that plastic flow is intermittent [2], acoustic emission (AE) is readily used to record the crackling noise from deforming crystals [3][4][5][6][7][8]. In such experiments, the AE amplitude reveals power-law scaling indicative of the scale-free nature of plastic deformation.…”

Section: Introductionmentioning

confidence: 99%

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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“…In bulk materials, a direct correlation of AE parameters with the stress-strain curves can reveal the activation of different deformation mechanisms [37][38][39][40] . It is important to note that the collective motion of at least several tens of dislocations is necessary in order to obtain a detectable AE signal 41 .…”

Section: Acoustic Emission Measurementmentioning

confidence: 99%

Micron-Scale Deformation: A Coupled In Situ Study of Strain Bursts and Acoustic Emission

et al. 2017

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Plastic deformation of micron-scale crystalline materials differ considerably from bulk ones, because it is characterized by random strain bursts. To obtain a detailed picture about this stochastic phenomenon, micron sized pillars have been fabricated and compressed in the chamber of a SEM. An improved FIB fabrication method is proposed to get non-tapered micro-pillars with a maximum control over their shape. The in-situ compression device developed allows high accuracy sample positioning and force/displacement measurements with high data sampling rate. The collective avalanche-like motion of dislocations appears as stress drops on the stress-strain curve. To confirm that these stress drops are directly related to dislocation activity, and not to some other effect, an acoustic emission transducer has been mounted under the sample to record emitted acoustic activity during strain-controlled compression tests of Al-5% Mg micro-pillars. The correlation between the stress drops and the acoustic emission signals indicates that indeed dislocation avalanches are responsible for the stochastic character of the deformation process.

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Evidence for universal intermittent crystal plasticity from acoustic emission and high-resolution extensometry experiments

Cited by 126 publications

References 28 publications

Universal fluctuations and extreme statistics of avalanches near the depinning transition

Universal fluctuations and extreme statistics of avalanches near the depinning transition

Slip statistics of dislocation avalanches under different loading modes

Micron-Scale Deformation: A Coupled In Situ Study of Strain Bursts and Acoustic Emission

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