Continuous acoustic emission during intermittent plastic flow in α-brass

Vinogradov, Alexei; Lazarev, A.

doi:10.1016/j.scriptamat.2012.01.053

Cited by 40 publications

(25 citation statements)

References 23 publications

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“…3b, these oscillations are directly and quite precisely correlated to the PLC serrations on the deformation curve. The reduction in median frequency is typically attributed to enhanced correlations in dislocation processes and strain localization [7][8][9], and this observation agrees with similar investigations on bulk Al5Mg samples [7,9]. On conducting similar experiments with microcellular samples of pure aluminum, no such fluctuation were observed, Fig.…”

Section: Tab 1 Main Characteristics Of Al and Al2mg Foam Samples Insupporting

confidence: 88%

“…In the present mechanical tests, the AE signal was recorded during the deformation and analyzed to detect whether it contains typical features of the AE signal recorded in bulk metals exhibiting the PLC effect. The AE signal median frequency was evaluated as it has been shown to be a credible indicator of correlations in collective dislocation dynamics [7,8]. The time-window used for the calculation of median frequency was 500 µs; the data were smoothed using Savitzky-Golay filter.…”

Section: Tab 1 Main Characteristics Of Al and Al2mg Foam Samples Inmentioning

confidence: 99%

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Occurrence of the Portevin Le-Châtelier effect in open-cell microcellular Al-2wt% Mg

et al. 2017

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Microcellular open-cell metal foams with pores of 75 or 400 µm in diameter and made of pure Al or Al-2 wt% Mg are tested in compression. The aluminum foam exhibits a typical smooth plastic flow and a positive strain rate sensitivity, whereas plastic instabilities and a negative strain rate sensitivity appear in the stress-strain curves of the Al-2 wt% Mg foams, indicating the presence of the Portevin Le-Châtelier (PLC) effect. The effect is further confirmed by acoustic emission analysis. Taken together, the data indicate that the PLC effect is caused in this material by the sudden collective deformation of many struts across the material.

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Section: Tab 1 Main Characteristics Of Al and Al2mg Foam Samples Insupporting

confidence: 88%

Section: Tab 1 Main Characteristics Of Al and Al2mg Foam Samples Inmentioning

confidence: 99%

Occurrence of the Portevin Le-Châtelier effect in open-cell microcellular Al-2wt% Mg

et al. 2017

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“…The latter effect in fcc alloys such as Al-Mg alloys or α-brass is also accompanied by the sharply increasing AE energy (or power) as the stress drops. However, this drop is complemented by a pronounced concomitant reduction in the AE median frequency, which occurs due to increasing correlation the moving dislocation ensembles [57]. Deformation stages are indicated schematically in Figures 5 and 6 and the corresponding deformation mechanisms are identified through the analysis of their AE response.…”

Section: Resultsmentioning

confidence: 99%

Evolution of Mechanical Twinning during Cyclic Deformation of Mg-Zn-Ca Alloys

Vinogradov

Васильев

Linderov

et al. 2016

Metals

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Abstract:The present study clarifies the complex interplay between mechanical twinning and dislocation slip during low-cycle fatigue testing of Mg-Zn-Ca alloys. Temporal details of these mechanisms are studied non-destructively by in situ monitoring of the acoustic emission (AE) response powered by a robust signal categorization. Through the analysis of AE time series, the kinetics of deformation twinning per cycle and the overall accumulation of twinning during cyclic loading is described and its effect on fatigue life is highlighted.

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“…There is a strong correlation between the AE waveforms and material deformation 5 . AE is not an electrochemical method, but by utilizing the sensitivity of the technique to the growth and initiation of micro-cracks as a consequence of corrosion reaction, the phenomenon of corrosion can be identified 6 .…”

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confidence: 91%

Acoustic emission-based mathematical procedure for quantification of rebar corrosion in reinforced concrete

Patil¹,

Goyal²

2015

Current Science

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One of the most important causes for deterioration of reinforced concrete structures is corrosion of steel rebar in concrete. Acoustic emission (AE) technique is reported as an effective non-destructive tool for qualitatively identifying the onset of rebar corrosion. The applicability of AE for quantitative assessment of rebar corrosion in concrete is studied here. Statistical analysis of experimental results under accelerated corrosion confirmed a promising relationship between gravimetrical rebar mass loss and AE measurement. The efficacy of the developed mathematical model was further confirmed under realistic prolonged corrosion exposure. Thus, a new procedure has been developed for quantification of rebar corrosion through experimental verification.

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Continuous acoustic emission during intermittent plastic flow in α-brass

Cited by 40 publications

References 23 publications

Occurrence of the Portevin Le-Châtelier effect in open-cell microcellular Al-2wt% Mg

Occurrence of the Portevin Le-Châtelier effect in open-cell microcellular Al-2wt% Mg

Evolution of Mechanical Twinning during Cyclic Deformation of Mg-Zn-Ca Alloys

Acoustic emission-based mathematical procedure for quantification of rebar corrosion in reinforced concrete

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