Grain size effects on deformation twinning in an extruded magnesium alloy tested in compression

Dobroň, Patrik; Chmelı́k, František; Yi, Sangbong; Parfenenko, K.; Letzig, Dietmar; Bohlen, Jan

doi:10.1016/j.scriptamat.2011.05.027

Cited by 132 publications

(55 citation statements)

References 11 publications

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“…It has been shown that twin growth itself is not a source of AE whereas the formation of new twins is [11]. This is very similar to the ndings in an earlier paper [9] in which it was shown that twin growth without formation of new twins does not produce any detectable AE. The similarity between the mechanisms of twin growth and twin shrinkage (or untwinning) allow the assumption to be made, that the untwinning mechanism will also not produce AE [11].…”

Section: Methodssupporting

confidence: 85%

“…In an earlier paper it was shown that twins are preferentially activated in larger grains in the case of a distinct grain size distribution [9]. After reaching a maximum number of twins in the microstructure, the twinned fraction of the microstructure increases, i.e.…”

Section: Methodsmentioning

confidence: 96%

“…Secondly, the grain size * corresponding author; e-mail: jan.bohlen@hzg.de distribution plays an important role for the activation of twinning. Dobron et al [9] have shown that larger grains tend to twin preferentially compared to smaller grains. New twins form in the strain regime where an increasing work hardening rate is found, i.e.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Reversed Loading Conditions on the Mechanical Behaviour of Extruded Magnesium Alloy AZ31

et al. 2012

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An indirectly extruded round bar of magnesium alloy AZ31 has been subjected to a cyclic test consisting of preloading in compression to dierent values of maximum stress followed by a single tensile test segment. Concurrent acoustic emission measurements were used to determine the active deformation mechanisms during plastic ow and work hardening. Electron backscattering diraction was applied to obtain local orientation images in order to reveal twins and twinned fractions of the microstructure. Twins form preferentially in larger grains during the compression test segment and only with increasing stress do smaller grains show twinning. Some grains are completely re-oriented as a result of twinning. During the tensile test segment, untwinning is the most signicant deformation mechanism although in some re-oriented grains new twins also nucleate. The acoustic emission count rates conrm that this is only the case after compression to higher stress levels.

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Section: Methodssupporting

confidence: 85%

Section: Methodsmentioning

confidence: 96%

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The Effect of Reversed Loading Conditions on the Mechanical Behaviour of Extruded Magnesium Alloy AZ31

et al. 2012

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“…Only nucleation of twins can produce AE signals, which are not yet reduced by strain hardening. Similar inuence of nucleation of twins on the AE activity was observed in [26].…”

Section: Discussionsupporting

confidence: 79%

Influence of Pre-Compression on Tensile Behaviour in Wrought Mg-Zn-Ce Alloy Studied by the Acoustic Emission Technique

et al. 2015

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Wrought MgZnCe alloy (ZE10) has been pre-compressed and subsequently subjected to tensile loading. Due to a bre texture of the samples, the level of pre-compression stress signicantly inuences the subsequent tensile behaviour. The acoustic emission technique was used for monitoring active deformation mechanisms during mechanical testing. The obtained acoustic emission results are correlated to the stress-time curves and the dierences in the acoustic emission count rate were used to reveal changes in underlying deformation mechanisms. Firstly, a compression-tension cycle was monitored by the acoustic emission technique. Then, the samples were deformed to specic points on the stress-time curve, where acoustic emission exhibits strong changes in the activity. The following microstructure analysis of the samples, deformed to dierent strain-levels, by using electron back scattered diraction method brought a detailed insight into active deformation mechanisms. Twinning during the pre-compression was followed by detwinning during the tensile loading. Two consecutive acoustic emission peaks, which appeared at larger strains, are explained by interplay of detwinning and dislocation slip and a nucleation of compression twins, respectively.

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“…In this study, no evidence for deformation twinning was found, although the deformation was carried out at low temperatures around 200 ºC. In case of extension twinning, this can be attributed to fine grained microstructure and the texture of the material [28,29]. Such a texture is unfavourable for this twinning mode due to the preferential alignment of basal planes in the extrusion direction.…”

Section: Microstructural Developmentmentioning

confidence: 58%

Microstructure and texture development in hydrostatically extruded Mg–Al–Zn alloys during tensile testing at intermediate temperatures

Victoria-Hernández

Letzig

et al. 2013

Acta Materialia

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Tensile testing of hydrostatically extruded round bars of AZ31 and AZ61 has been performed to analyse the flow behaviour as well as the microstructure and texture development as a function of temperature (175-225 °C) and strain rate (0.0001-0.01). The post-testing microstructure is a result of dynamic recrystallisation with varying significance of different texture components. In some cases the resulting textures are found to be similar to those textures that typically develop during extrusion of rare earth containing magnesium alloys. Dynamic recrystallisation (DRX) and grain boundary sliding (GBS) are considered as the mechanisms that generate the changes in texture. Precipitates can exert a grain boundary pinning effect limiting grain growth. These different mechanisms contribute differently to the texture development if the testing parameters were changed.

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Grain size effects on deformation twinning in an extruded magnesium alloy tested in compression

Cited by 132 publications

References 11 publications

The Effect of Reversed Loading Conditions on the Mechanical Behaviour of Extruded Magnesium Alloy AZ31

The Effect of Reversed Loading Conditions on the Mechanical Behaviour of Extruded Magnesium Alloy AZ31

Influence of Pre-Compression on Tensile Behaviour in Wrought Mg-Zn-Ce Alloy Studied by the Acoustic Emission Technique

Microstructure and texture development in hydrostatically extruded Mg–Al–Zn alloys during tensile testing at intermediate temperatures

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