Ex-situ EBSD analysis of yield asymmetry, texture and twinning development in Mg–5Li–3Al–2Zn alloy during tensile and compressive deformation

Li, Xiaoqiang; Cheng, Chuan; Le, Qichi; Zhou, Xiong; Liao, Qiyu; Chen, Xingrui; Jia, Yonghui; Wang, Ping

doi:10.1016/j.jallcom.2019.07.099

Cited by 48 publications

(9 citation statements)

References 49 publications

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“…In general, the tension-compression yield asymmetry is low in the Mg-RE-based extrusions, and it may not be apparent in alloys containing large amounts of RE elements, Table VII. [180,183,184,[259][260][261][262][263][264][265][266][267][268][269][270]…”

Section: Polycrystalline Extrusionsmentioning

confidence: 99%

Microstructure, Deformation, and Property of Wrought Magnesium Alloys

Nie

Shin

Zeng

2020

Metall Mater Trans A

156

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Pure magnesium (Mg) develops a strong basal texture after conventional processing of hot rolling or extrusion. Consequently, it exhibits anisotropic mechanical properties and is difficult to form at room temperature. Adding appropriate alloying elements can weaken the basal texture or even change it, but the improvement in formability and mechanical properties is still far from expectations. Over the past 20 years, considerable efforts have been made and significant progress has been made on wrought Mg alloys at the fundamental and technological levels. At the fundamental level, textures formed in sheets and extrusions of different alloy compositions and produced under different strain paths or thermomechanical processing conditions are relatively well established, with the assistance of the advanced characterization technique of electron backscatter diffraction. At the technological level, room temperature formability of sheet has been significantly improved, and tension-compression yield asymmetry of extrusion is also remarkably reduced or eliminated. This paper starts with an overview of dislocations, stacking faults and twins, and deformation of single crystals of pure Mg along different orientations and under different loading conditions, followed by a review of microstructure (texture and grain size) and deformation of polycrystalline pure Mg with different textures, grain sizes, and loading conditions. With this information as a base, texture, grain size, and deformation of polycrystalline Mg alloy sheets and extrusions produced under different processing conditions are systematically examined and compared. Remaining and emerging scientific and technology issues are then highlighted and discussed in the context of texture and grain size. The need for better-resolution diffraction and spectroscopy techniques is also discussed in the relationship between texture change and grain boundary solute segregation.

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Section: Polycrystalline Extrusionsmentioning

confidence: 99%

Microstructure, Deformation, and Property of Wrought Magnesium Alloys

Nie

Shin

Zeng

2020

Metall Mater Trans A

156

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“…As shown in figure 4(b), when the amount of deformation of alloy increases to 45%, the number of recrystallized grains increases dramatically and the average grain size further decreases. From figures 4(c) and (d), the average misorientation angle increases with increasing of the rolling deformation, which indicate that the proportion of high angle grain boundaries increases because of increasing of the number of recrystallize grains [19]. Otherwise, it's worth noting that only a few of misorientation angle concentrate on near high-angle boundaries (figures 4(c) and (d)), which indicate that few {10-12} extension twinning and {10-11} contraction twinning exist in deformed alloy.…”

Section: Microstructural Characterizationmentioning

confidence: 85%

“…Otherwise, it's worth noting that only a few of misorientation angle concentrate on near high-angle boundaries (figures 4(c) and (d)), which indicate that few {10-12} extension twinning and {10-11} contraction twinning exist in deformed alloy. Related studies have reported that these twins have a special orientation relationship with the parent crystal ({10-12} twin 86.1°and {10-11} twin 56°) [19,20]. Thereby, in order to observe twinning boundaries distribution visually, we used EBSD technology to index twinning boundaries (figures 4(e) and (f)), the red and blue lines represent extension twinning boundaries and contraction twinning boundaries, respectively.…”

Section: Microstructural Characterizationmentioning

confidence: 99%

Effect of rolling deformation on microstructure and mechanical properties of Mg-6Sn-3Al-1Zn alloy

Wei

Zhang

Shi

et al. 2020

Mater. Res. Express

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The Mg-6Sn-3Al-1Zn alloys treated with the solid solution were induced 25%, 45%, 65% and 85% rolling deformation at 400°C, respectively. The microstructures of as-rolled magnesium alloys were analyzed by XRD, OM, SEM and TEM, the mechanical properties were also measured. The results revealed that the rolled Mg-6Sn-3Al-1Zn alloys were composed of α-Mg matrix phase and Mg 2 Sn second phase, Mg 2 Sn distributed at the grain boundaries and intra-grains. With the increasing of the rolling deformation, the volume fraction of Mg 2 Sn phase distributed at the grain boundaries firstly decreased and then stabilized, the average size of Mg 2 Sn phase firstly increased and then decreased, the Mg 2 Sn phase distributed inside the grains gradually transformed from a rod shape to a spherical shape, the volume fraction of the recrystallized grains gradually increased and the average size of the recrystallized grains early decreased and eventually almost unchanged. When the rolling deformation exceeded 25%, the value of tensile strength and Vickers hardness of the Mg-6Sn-3Al-1Zn alloys increased with the rolling deformation. However, when the rolling deformation exceeded 65%, the elongation of the magnesium alloys diminished, however, the strength of as-rolled magnesium alloys did not increase significantly when the amount of rolling deformation increased from 65% to 85%. The mechanical properties were the best when the amount of rolling deformation reached 65%. Meanwhile, the volume fraction and area of Mg 2 Sn phase distributed on the grain boundaries were 2.9%, 105.5 μm 2 , the volume fraction and average grain size of recrystallized grains were 87% and 2.2 μm, respectively. In addition, it was worth noting that the Mg 2 Sn phase distributed inside the grains was radically converted into a spherical shape, and the tensile strength, elongation, hardness of the alloy were 317 MPa, 13% and 77.52 HV, respectively.

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“…However, MgAlLi 2 is not thermally stable and tends to be decomposed at 50-70°C, and is further decomposed to form the AlLi phase, which leads to a significant decrease in the mechanical properties of the Mg-Li-Al alloy at elevated temperatures. This phenomenon prevents Mg-Li-Al alloys from having ultra-low density and high strength simultaneously (Cui et al, 2011;Hagihara et al, 2019;Li et al, 2019). Therefore, it is important to improve the comprehensive mechanical properties of Mg-Li-Al alloy.…”

Section: Introductionmentioning

confidence: 99%

Hot Tensile Deformation Behavior of Mg-4Li-1Al-0.5Y Alloy

Yang

Wang

et al. 2021

Front. Mater.

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The microstructure evolution and deformation mechanism of the as-extruded-annealed Mg-4Li-1Al-0.5Y alloy (denoted as LAY410) were investigated during the hot tensile deformation at the temperatures between 150°C and 300°C with strains from 8 × 10−5 s−1 to 1.6 × 10−3 s−1. The results show that when the strain rate decreases and/or the deformation temperature increases, the peak stress of the alloy gradually decreases, and the elongations to fracture gradually increases. The true stress–strain curves show typical dynamic recrystallization (DRX) softening characteristics. It is observed that the microstructure in the magnesium (Mg) alloy deformed at 150°C is mainly composed of the deformed grains and a few recrystallized grains. The microstructures in the Mg alloy deformed at 200°C consisted of substructures and a slightly increasing number of dynamic recrystallized grains. When the deformation temperature reaches 250°C, the number of recrystallized grains increases significantly, and the microstructures are dominated by recrystallized grains. Moreover, through theoretical calculation and result analysis, the activation energy was about 99.3 kJ/mol, and the hot tensile deformation mechanism was the alternate coordinated deformation mechanism among grain boundary slip (GBS), intragranular slip, and DRX.

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Ex-situ EBSD analysis of yield asymmetry, texture and twinning development in Mg–5Li–3Al–2Zn alloy during tensile and compressive deformation

Cited by 48 publications

References 49 publications

Microstructure, Deformation, and Property of Wrought Magnesium Alloys

Microstructure, Deformation, and Property of Wrought Magnesium Alloys

Effect of rolling deformation on microstructure and mechanical properties of Mg-6Sn-3Al-1Zn alloy

Hot Tensile Deformation Behavior of Mg-4Li-1Al-0.5Y Alloy

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