Investigating deformation processes in AM60 magnesium alloy using the acoustic emission technique

Máthis, Kristián; Chmelı́k, František; Janeček, Miloš; Hadzima, Branislav; Trojanová, Zuzanka; Lukáč, P.

doi:10.1016/j.actamat.2006.06.033

Cited by 66 publications

(36 citation statements)

References 22 publications

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“…Similar to the growth or thickening of twins, detwinning or thinning is basically a movement of twin boundaries, so no detectable AE signal [31,36,37] is expected as a result of this mechanism.…”

Section: General Findings During Pre-compression and Reverse Tensile mentioning

confidence: 99%

Investigating a twinning–detwinning process in wrought Mg alloys by the acoustic emission technique

Drozdenko

Bohlen

et al. 2016

Acta Materialia

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Two extruded magnesium alloys, AZ31 with a bimodal microstructure and ZE10 with a homogeneous microstructure, were pre-compressed and subsequently subjected to tensile loading. The acoustic emission (AE) technique was concurrently applied to determine the activity of particular deformation mechanisms. Significant changes in the AE response were correlated with the inflection points on the tensile curve. Twinning and detwinning processes were analyzed using the AE dataset. Particularly, nucleation of various types of twins and the influence of twins produced by pre-straining on the subsequent hardening behavior were investigated in detail. The output of the AE analysis was related to microstructure observations provided by the electron backscattered diffraction (EBSD) method.2

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Section: General Findings During Pre-compression and Reverse Tensile mentioning

confidence: 99%

Investigating a twinning–detwinning process in wrought Mg alloys by the acoustic emission technique

Drozdenko

Bohlen

et al. 2016

Acta Materialia

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“…Acoustic emission (AE) is defined (ASTM E1316-10c) by the sudden redistribution of energy in a solid caused by the activation and/or development of one or more localized sources, which are typically part of irreversible processes related to deformation and damage across materials including fracture, slip activity, twinning, phase transformations, and delaminations (Chung and KannateyAsibo, 1992;Koslowski et al, 2004;Lamark et al, 2004;Lockner et al, 1991;Lou et al, 2007;Mathis et al, 2006;Miguel et al, 2001;Richeton et al, 2006;van Bohemen et al, 2003;Vanniamparambil et al, 2015;Wisner et al, 2015). More specifically, AE is generated when the energy stored in a material or structure is released and dissipated in the form of transient elastic waves that typically have frequencies in the ultrasonic regime depending on the source size and duration of the damage process, as recently demonstrated by the authors (Cuadra et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Energy dissipation via acoustic emission in ductile crack initiation

et al. 2016

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This article presents a modeling approach to estimate the energy release due to ductile crack initiation in conjunction to the energy dissipation associated with the formation and propagation of transient stress waves typically referred to as Acoustic Emission. To achieve this goal, a ductile fracture problem is investigated computationally using the Finite Elements Method based on a compact tension geometry under Mode I loading conditions. To quantify the energy dissipation associated with Acoustic Emission, a crack increment is produced given a pre-determined notch size in a 3D cohesive-based extended finite element model. The computational modeling methodology consists of defining a damage initiation state from static simulations and linking such state to a dynamic formulation used to evaluate wave propagation and related energy redistribution effects.The model relies on a custom traction separation law constructed using full field deformation measurements obtained experimentally using the Digital Image Correlation method. The amount of energy release due to the investigated first crack increment is evaluated through three different approaches both for verification purposes and to produce an estimate of the portion of the energy that radiates away from the crack source in the form of transient waves. The results presented herein propose an upper bound for the energy dissipation associated to Acoustic Emission, which could assist the interpretation and implementation of relevant nondestructive evaluation methods and the further enrichment of the understanding of effects associated with fracture.

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“…The initial peak of the AE evolution can be ascribed to the synergic activity of dislocation slip and deformation twinning [13,14]. The AE signal vanishes above this level for two main reasons.…”

Section: Acoustic Emission and Ebsdmentioning

confidence: 96%

“…In order to study this observation more systematically, we separated the dislocation and twinning signals. In general, the waveforms they emit are different: the dislocation slip produces a rather continuous signal, whereas the twinning emits a characteristic burst-type signal [14,15]. Owing to the concurrent activity of multiple sources, a simple visual-inspection-based classification of the signal is precluded and a statistical approach is instead required.…”

Section: Acoustic Emission and Ebsdmentioning

confidence: 98%

In situ investigation of deformation mechanisms in magnesium-based metal matrix composites

et al. 2015

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We studied the effect of short fibers on the mechanical properties of a magnesium alloy. In particular, deformation mechanisms in a Mg-Al-Sr alloy reinforced with short alumina fibers were studied in situ using neutron diffraction and acoustic emission methods. The fibers' plane orientation with respect to the loading axis was found to be a key parameter, which influences the acting deformation processes, such as twinning or dislocation slip. Furthermore, the twinning activity was much more significant in samples with parallel fiber plane orientation, which was confirmed by both acoustic emission and electron backscattering diffraction results. Neutron diffraction was also used to assist in analyzing the acoustic emission and electron backscattering diffraction results. The simultaneous application of the two in situ methods, neutron diffraction and acoustic emission, was found to be beneficial for obtaining complementary datasets about the twinning and dislocation slip in the magnesium alloys and composites used in this study.

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Investigating deformation processes in AM60 magnesium alloy using the acoustic emission technique

Cited by 66 publications

References 22 publications

Investigating a twinning–detwinning process in wrought Mg alloys by the acoustic emission technique

Investigating a twinning–detwinning process in wrought Mg alloys by the acoustic emission technique

Energy dissipation via acoustic emission in ductile crack initiation

In situ investigation of deformation mechanisms in magnesium-based metal matrix composites

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