On the long-term correlations in the twinning and dislocation slip dynamics

Agletdinov, E. A.; Drozdenko, Daria; Harcuba, Petr; Dobroň, Patrik; Мерсон, Д. Л.; Vinogradov, A. Yu.

doi:10.1016/j.msea.2020.139091

Cited by 10 publications

(4 citation statements)

References 37 publications

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“…The twin nucleated at the grain boundary propagates in the in-twin-plane directions, terminating finally at the opposite grain boundaries where the stress fields can be relaxed either by dislocation slip or by a new twin that can be nucleated at the twin tip in the same or neighbouring grain. In this "relay-like" behaviour, the parent twins follow a Poisson process while the descendants (child twins) are triggered in the close proximity to the parent twins giving rise to the observed memory of the past in AE times series [47,48]. The results of direct video observations corroborate the proposed scenario as demonstrated in Fig.…”

Section: Introductionsupporting

confidence: 78%

“…We should note that this equation, by its nature, does not imply any twin-twin interactions, thus missing their crucial significance for the accumulation of deformation twins and for the overall strain hardening behaviour of materials whose deformation is governed by mechanical twinning [25,[44][45][46]. In this context, it is timely to recall that the statistical analysis of acoustic emission time series recorded from plastically deforming polycrystalline magnesium-based ZK60 alloy and single crystalline pure Mg revealed that mechanical twinning belongs to a class of non-Poisson processes with a relatively long memory of the past [47,48] (the same conclusion applies to titanium and TWIP-steels). There is abundant evidence to support this premise.…”

Section: Introductionmentioning

confidence: 99%

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A phenomenological model of deformation twinning kinetics

Vinogradov

2021

Materials Science and Engineering: A

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Section: Introductionsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

A phenomenological model of deformation twinning kinetics

Vinogradov

2021

Materials Science and Engineering: A

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“…Twinning and dislocation slip produce acoustic emissions in HCP metals and their alloys. By analyzing the acoustic emissions of slip and twinning in conjunction with microscopy, workers have shown that twinning is a process with memory, that is, past twinning events affect the occurrence of later twinning events (Agletdinov et al., 2020; Vinogradov, 2021; Vinogradov et al., 2019). The twinning events are on the order of a few tenths of a millisecond to a few milliseconds.…”

Section: Discussionmentioning

confidence: 99%

Jeptha Knob, Kentucky, a probable meteorite impact structure

Schedl

2023

Meteorit & Planetary Scien

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Jeptha Knob is a deformed structure, 4.5 km in diameter, composed entirely of carbonate rocks in the stable craton of North America. At Jeptha Knob, conventional evidence of meteorite impact, shock metamorphism, has not been found. I used calcite twin analysis to test the hypothesis that Jeptha Knob is a meteorite impact crater. Calcite twinning gives differential stresses of >170 MPa in rocks that were 600 to ≈800 m below the surface when the rocks were deformed. Under these conditions, high differential stresses cannot be explained by tectonic processes. In addition, twin intensities are >150 twins/mm which are >50% higher than the highest twin intensities observed in limestone from a wide variety of tectonic settings. Twin intensities and differential stresses are the same magnitudes as those found at Serpent Mound, a proven impact structure. Consistent with meteorite impact, differential stresses increase toward the center of the structure. If one accepts that Jeptha Knob is a marine impact crater, then (1) the presence of high temperature (>250°C) thick twins in calcite from a resurge deposit; (2) the extensive dolomitization of the central uplift with water/rock ratios >1.0; and (3) two episodes of calcite twin recorded incremental strains, are explained.

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“…Spectacular illustrations of such a complexity were also found in the study of the spatio-temporal evolution of the strain-rate fields [42]. Thus it is not surprising that further efforts envisaged AE investigations of the PLC effect at shorter time scales, by either capturing waveforms of individual AE hits in the pre-triggering mode [74,75], or by applying recently developed methods of continuous AE recording ('datastreaming') [76,77]. This latter approach is rapidly gaining interest due to the exquisitely detailed information it affords for multiscale analysis.…”

Section: Ae: Towards Finer Time Scalesmentioning

confidence: 99%

Complex patterning in jerky flow from time series analysis and numerical simulation

Fressengeas,

Lebedkina,

Lebyodkin

2024

Modelling Simul. Mater. Sci. Eng.

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The paper is a tribute to Ladislas P. Kubin's long-standing work on the collective behavior of dislocations in jerky flow. In a first part, it reviews his contributions to the statistical, dynamical and multifractal analyses carried out on stress-time series recorded from both single crystals and polycrystalline samples of dilute alloys subjected to tensile tests at constant strain rate. Various spatio-temporal dynamical regimes were found as the applied strain rate was varied. Type C static bands were associated with quasi-random collective behavior, the hopping type B and propagating type A bands could be shown to correspond to chaotic and self-organized critical dynamics, respectively. The crossover between the A and B regimes was characterized by a large spread in the multifractal spectrum of stress drops, associated with heterogeneity of the dynamics. In a second part, the paper reviews the nonlocal models Ladislas inspired to interpret these results from numerical solutions of the boundary value problem, on the basis of dynamic strain aging, the incompatibility stresses associated with dislocations, their plastic relaxation and the spatial couplings they inherently involve. Eventual developments of this research, rooted in the same ideas, on the statistical and multifractal analyses of the accompanying acoustic emission are reviewed and discussed in terms of the synchronization of small-scale plastic events.

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On the long-term correlations in the twinning and dislocation slip dynamics

Cited by 10 publications

References 37 publications

A phenomenological model of deformation twinning kinetics

A phenomenological model of deformation twinning kinetics

Jeptha Knob, Kentucky, a probable meteorite impact structure

Complex patterning in jerky flow from time series analysis and numerical simulation

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