Journal ArticleDOI
{101¯2}−{101¯2} double tensile twinning in a Mg-3Al-1Zn alloy sheet during cyclic deformation
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TLDR
In this paper, the typical fracture morphology of the Mg-3Al-1Zn alloy after cyclic deformation was investigated using optical microscopy (OM), and an electron back-scatter diffraction (EBSD).Abstract:
The typical fracture morphology of the Mg-3Al-1Zn alloy after cyclic deformation was investigated using optical microscopy (OM), and an electron back-scatter diffraction (EBSD). A novel finding of this study is that large number of stripe-like laminas were found within the primary { 10 1 ¯ 2 } tensile twins in the crack initiation and crack propagation regions. It is shown that these laminas primarily result from { 10 1 ¯ 2 } − { 10 1 ¯ 2 } twinning during cyclic deformation. According to the results and combined with theoretical analysis, the formation of { 10 1 ¯ 2 } − { 10 1 ¯ 2 } twins are largely contributing to the local strain accommodation caused by different twin variants.read more
Citations
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Towards understanding double extension twinning behaviors in magnesium alloy during uniaxial tension deformation
Pengfei Yang,Marjorie Levine-Clark,Mia Consalvo,Zhiyuan Yang,Lin Li,Qi Sun,Li Tan,Xinkai Ma,Minhao Zhu +8 more
TL;DR: In this article, the authors reported that the formation of these secondary twins may be closely related to the minimization of local strain incompatibility at the twinning boundary caused by the basal dislocation within the primary twins.
Journal ArticleDOI
Towards understanding double extension twinning behaviors in magnesium alloy during uniaxial tension deformation
TL;DR: In this article , an atypical double twinning sequence was found to occur during uniaxial loading, where the external tension loading is parallel to the normal direction of magnesium alloy plate.
Journal ArticleDOI
The second phases of Mg–xAl–ySi–Ca alloys and their influences on properties
TL;DR: In this article , the types and changes of the second phases in the Mg-xAl-ySi-0.3Ca alloys and their effects on the properties of the alloys were studied.
Journal ArticleDOI
On the cyclic hardening/softening behavior of a rare earth-containing magnesium alloy during strain-controlled fatigue
TL;DR: In this paper , the origin of cyclic hardening under low strain amplitude (with N = 25284 cycles to failure) followed by pseudo-plateau response under high strain amplitude during fully reversal (R = −1) strain-controlled pull-push fatigue of Mg-8.2Gd-3.6Y-1.6Zn-0.5Zr (wt.%) at room temperature condition was explored.
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Activation Behavior of {10-12}-{10-12} Secondary Twins by Different Strain Variables and Different Loading Directions during Fatigue Deformation of AZ31 Magnesium Alloy
TL;DR: In this paper, the tensile and compression fatigue deformation tests of AZ31 magnesium alloy were carried out at room temperature, and the activation behavior of {10-12}-{1012} secondary twins in different loading directions (ND normal direction, RD rolling direction) and different strain amplitude (0.5%, 1%) was studied.
References
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Journal ArticleDOI
Twinning and the ductility of magnesium alloys: Part II. “Contraction” twins
TL;DR: In this paper, a series of tensile and compression tests results are reported for common wrought alloys: AZ31, ZK60 and ZM20, and these data are combined with EBSD analysis and simple flow stress models to argue the following: (i) contraction double twinning (which enables contraction along the c axis) can decrease the uniform elongation, and (ii) compression double twinening can also account for shear failure at low strains.
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Role of {10–12} twinning characteristics in the deformation behavior of a polycrystalline magnesium alloy
TL;DR: In this paper, the activation of specific twin variants depending on the strain path induced a significant difference in twinning characteristics, such as twin morphology, volume fraction of twins with strain, and twin texture, and consequently gave rise to a totally different effect on the deformation.
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Deformation microstructures and textures of some cold rolled Mg alloys
TL;DR: In this paper, electron backscatter diffraction (EBSD) is employed to characterize the deformation microstructures and textures established during the cold rolling of pure Mg, Mg 0.2Ce and Mg 3Al-1Zn (also known as AZ31).
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Non-Schmid behaviour during secondary twinning in a polycrystalline magnesium alloy
TL;DR: In this article, electron backscattering diffraction and Schmid analysis were combined to investigate secondary twinning in the magnesium alloy Mg-3Al-1Zn. But the secondary twin's activation was quite inconsistent with Schmid-type behaviour.
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Crack initiation mechanism of extruded AZ31 magnesium alloy in the very high cycle fatigue regime
TL;DR: In this article, fatigue failure mainly originated from the specimen surface or near surface, where deformation twins were found after cyclic loading, and fatigue damage mechanisms were proposed in terms of surface/near surface crack initiation.