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

Drozdenko, Daria; Bohlen, Jan; Yi, Sangbong; Minárik, Peter; Chmelı́k, František; Dobroň, Patrik

doi:10.1016/j.actamat.2016.03.013

Cited by 76 publications

(39 citation statements)

References 42 publications

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“…The AE energy also drops at the point of loading reversal and remains low as long as the de-twinning process is active on the tensile part of each cycle. This finding is close to the results reported in [32,54,59], where it was argued that the de-twinning process, which is systematically observed at strain path reversal in Mg polycrystals, proceeds at the velocities much slower than those at twin nucleation and is not directly detectable by AE. This can be clearly seen on the enlarged fragment of the AE time-series shown in Figure 5b.…”

Section: Resultssupporting

confidence: 78%

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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Section: Resultssupporting

confidence: 78%

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

Vinogradov

Васильев

Linderov

et al. 2016

Metals

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“…On reversal of the strain paths, the twins formed during pre-straining tend to detwin as lower stresses are required for detwinning as compared to twin propagation. Similar works [18,19] have shown that detwinning via atomic shuffling occurs as a consequence of strain path changes.…”

mentioning

confidence: 53%

“…The findings discussed above lay an important insight for quantifying the influence of deformation rate on stress-triaxiality. Previously detwinning in the literature has been strongly credited to pure atomic shuffling [17][18][19]. Proust et al [17], have shown that detwinning occurs in the case of specimens subjected to strain path changes along the rolling direction (RD) or extruded direction (ED).…”

mentioning

confidence: 99%

On the roles of stress-triaxiality and strain-rate on the deformation behavior of AZ31 magnesium alloys

Kale

Rajagopalan

Turnage

et al. 2017

Materials Research Letters

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The presence of complex states-of-stress and strain-rates directly influence the dominant deformation mechanisms operating in a given material under load. Mg alloys have shown limited ambient temperature formability due to the paucity of active slip-mechanisms, however, studies have focused on quasi-static strain-rates and/or simple loading conditions (primarily uniaxial or biaxial). For the first time, the influence of strain-rate and stress-triaxiality is utilized to unravel the active deformation mechanisms operating along the rolling, transverse-and normal-directions in wrought AZ31-alloy. It is discovered that the activation of various twin-mechanisms in the presence of multiaxial loading is governed by the energetics of the applied strain-rates. IMPACT STATEMENTIt is shown for the first time that the higher deformation energy associated with dynamic strain-rates, coupled with high-triaxiality, promotes detwinning and texture evolution in HCP alloys with high c/a ratio. ARTICLE HISTORY

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“…Recently the grain size dependence of twinning has been documented; twins first occur in larger grains and with a progress of plastic deformation they can be activated also in smaller grains. [3,[21][22][23] Hence, in all investigated alloys, twins form preferentially in the unrecrystallized grains. The presence of the LPSO phase may inhibit or delay twinning activity due to a high density of stacking faults enriched with Zn/Y in the basal planes.…”

Section: Discussionmentioning

confidence: 99%

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

Cited by 76 publications

References 42 publications

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

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

On the roles of stress-triaxiality and strain-rate on the deformation behavior of AZ31 magnesium alloys

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

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