Mobility of pinned twin boundaries during mechanical loading of extruded binary Mg-1Zn alloy

Drozdenko, Daria; Dobroň, Patrik; Yi, Sangbong; Horváth, Klaudia; Letzig, Dietmar; Bohlen, Jan

doi:10.1016/j.matchar.2018.02.034

Cited by 20 publications

(23 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using misorientation analysis it was revealed that the orientation of the secondary twins is identical to the initial orientation of the lattice. This mode of detwinning was observed previously . As a result of twin boundary migration, low angle boundaries were observed at the positions of the original twin boundaries after detwinning .…”

Section: Discussionsupporting

confidence: 82%

“…This mode of detwinning was observed previously . As a result of twin boundary migration, low angle boundaries were observed at the positions of the original twin boundaries after detwinning . It can be concluded that detwinning is realized by the same twinning mode as twinning during the pre‐straining …”

Section: Discussionsupporting

confidence: 79%

“…Most of the grains continue to show nucleation of twins by the same variant of extension twins, which was active during pre‐straining. This can be explained by a higher value of the Schmid factor for this variant of twin . The high amplitude AE signal, observed at YS, Figure a, confirms a relatively high activity of new twin nucleation.…”

Section: Discussionmentioning

confidence: 74%

“…They concluded that the formation of secondary twins inside primary twins during reverse loading can be ascribed to the low mobility of the incoherent twin boundaries due to the hindering effect of precipitates. It was shown by Drozdenko et al that isothermal aging at 200 °C for 8 h does not completely disrupt the mobility of twin boundaries, and twin thickening or shrinkage can be observed. However, it was indicated that solute segregation due to heat treatment can lead to the appearance of secondary twinning inside existing twins as a special mode of the detwinning process.…”

Section: Introductionmentioning

confidence: 99%

“…During reverse loading of pre‐compressed Mg alloys, detwinning − that is, thickness reduction or complete disappearance of existing twin lamellae − becomes a key deformation mechanism . Detwinning can be realized either by migration of already existing twin boundaries or by secondary twinning inside existing twins . Ex situ and in situ methods, such as electron backscatter diffraction (EBSD), high‐speed imaging, and acoustic emission (AE) technique, have been successfully used for investigations of the twinning‐detwinning process during cyclic loading in Mg alloys …”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

et al. 2018

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionsupporting

confidence: 82%

Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%