Acoustic emission study on the activity of slip and twin mechanisms during compression testing of magnesium single crystals

Drozdenko, Daria; Bohlen, Jan; Chmelı́k, František; Lukáč, P.; Dobroň, Patrik

doi:10.1016/j.msea.2015.10.033

Cited by 33 publications

(25 citation statements)

References 27 publications

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“…Twin nucleation produces large amplitude AE signals and thus belongs to excellent sources of AE. [21,29] Consequently, the maximum in the AE count rate observed at the macroscopic yield point could be related to intensive twin nucleation and collective dislocation movement. The following decrease in the AE activity can be explained by reducing the mean free path of the dislocations due to increasing number of nucleated twins.…”

Section: Discussionmentioning

confidence: 99%

“…Deformation kinks are formed by basal dislocations, which produce generally low AE. [29] Moreover, they are activated at higher stress levels, where high dislocation density within the material reduces the AE activity. [29,33] It was also shown that the stacking faults suppress dislocation slip and enhance dislocation accumulation.…”

Section: Discussionmentioning

confidence: 99%

“…[29] Moreover, they are activated at higher stress levels, where high dislocation density within the material reduces the AE activity. [29,33] It was also shown that the stacking faults suppress dislocation slip and enhance dislocation accumulation. [34,35] It can be concluded that high fraction of LPSO phase (i.e., stacking faults) together with a low fraction of unrecrystallized grains are responsible for weak AE response in the WZ104 alloy.…”

Section: Discussionmentioning

confidence: 99%

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Characterization of Microstructure and Mechanical Properties of Mg–Y–Zn Alloys with Respect to Different Content of LPSO Phase

et al. 2017

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The Mg-Y-Zn alloys with different contents of alloying elements are extruded at an extrusion ratio of 4:1 at 350 C. The microstructure of the alloys is of an inhomogeneous character showing fine grains produced due to dynamic recrystallization and coarse original grains elongated along the extrusion direction (ED). Moreover, Y and Zn form a long-period stacking-ordered (LPSO) phase whose volume fraction increases with their increasing content in the alloy. All investigated alloys exhibit distinct fiber textures with basal planes oriented parallel to ED. It is seen that increasing content of alloying elements leads to a weaker texture. Compression tests with concurrent acoustic emission (AE) measurements are performed along ED at room temperature and a constant strain rate in order to reveal active deformation mechanisms in the alloys and to relate them to their mechanical properties. The AE response is also discussed with respect to the volume fraction of the LPSO phase.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Characterization of Microstructure and Mechanical Properties of Mg–Y–Zn Alloys with Respect to Different Content of LPSO Phase

et al. 2017

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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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“…AE is a powerful method for revealing the active deformation mechanisms and their development during loading. The AE technique was successfully used to investigate various metallic materials, especially with an hcp lattice, as it is highly sensitive to twin nucleation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Thermomechanical Treatment on Subsequent Deformation Behavior in a Binary Z1 Magnesium Alloy Studied by the Acoustic Emission Technique

et al. 2018

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Pre-straining of magnesium alloy modifies the final texture of the material and therefore leads to a different deformation behavior during subsequent loading. At the same time, heat treatment in the context of thermo-mechanical procedures is used as softening mechanism, as well as for age hardening processing. In mechanical conditions with twin-dominated deformation in textured magnesium alloys, the twin boundaries can be pinned if existing after a pre-deformation of samples and therefore influence their mobility. The impact of the ongoing mechanical behavior is discussed. In the present paper, a procedure of pre-compression and reverse tensile loading of extruded binary magnesium alloy Mg-1 wt% Zn (Z1) is used and intermediate aging at 200 C is applied in two different routes. The effect of the heat treatment on the flow behavior during subsequent mechanical loading is correlated with the dominating deformation mechanisms revealed by in situ acoustic emission measurements and ex situ scanning electron microscopy. The pinning of twin boundaries can restrict their mobility in experimental environments that favor the recovery of the samples. As a result, new twins easily nucleate if the concurrent re-orientation of the lattice is favorable for strain accommodation.

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Acoustic emission study on the activity of slip and twin mechanisms during compression testing of magnesium single crystals

Cited by 33 publications

References 27 publications

Characterization of Microstructure and Mechanical Properties of Mg–Y–Zn Alloys with Respect to Different Content of LPSO Phase

Characterization of Microstructure and Mechanical Properties of Mg–Y–Zn Alloys with Respect to Different Content of LPSO Phase

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

Effect of Thermomechanical Treatment on Subsequent Deformation Behavior in a Binary Z1 Magnesium Alloy Studied by the Acoustic Emission Technique

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