Quasi in-situ EBSD analysis of twinning-detwinning and slip behaviors in textured AZ31 magnesium alloy subjected to compressive-tensile loading

Zhu, Yuzhi; Hou, Dewen; Li, Qizhen

doi:10.1016/j.jma.2021.08.025

Cited by 51 publications

(9 citation statements)

References 56 publications

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“…To investigate the mechanism of dislocation slip during the tensile deformation of the extruded AS51 alloy, the in-grain misorientation axes (IGMA) analysis was performed on the microstructure after tensile deformation. IGMA can effectively determine the dominant intragranular slip mode and is widely used in the research of plastic deformation mechanisms of HCP alloys [ 35 , 36 , 37 ]. IGMA identifies the slip system generated within the grain by the preferred axis of lattice rotation within the grain, i.e., the Taylor axis.…”

Section: Discussionmentioning

confidence: 99%

Microstructure Evolution and Deformation Behavior of Extruded Mg-5Al-0.6Sc Alloy during Room and Elevated Temperature Tension Revealed by Ex-Situ EBSD and VPSC

et al. 2023

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In this study, the microstructure evolution and deformation behavior of the extruded Mg-5Al-0.6Sc (AS51) alloy during tensile testing at room temperature (RT) and 250 °C were investigated by electron backscattered diffraction (EBSD) characterization and Visco Plastic Self Consistent (VPSC) simulation. The results showed that a continuous hardening behavior of the alloy occurred during the deformation at RT, and a certain softening was caused by the occurrence of dynamic recovery (DRV) and dynamic recrystallization (DRX) in the late stage of deformation at 250 °C. The primary deformation mechanism at both RT and 250 °C was dislocation slip, with prismatic <a> slip being the dominant deformation mode, and no significant changes in grain size or texture type occurred. By identifying the activated twin variants, the results indicated that the selection of twin variants was closely related to the local stress concentration. The relatively low activation frequency of extension twinning at 250 °C is partly attributed to the fact that the consumption of dislocations by DRV and DRX can effectively relax the local stress concentration. Meanwhile, the DRX mechanism during the deformation of the alloy at 250 °C was mainly discontinuous dynamic recrystallization (DDRX), with a low recrystallization fraction.

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Section: Discussionmentioning

confidence: 99%

Microstructure Evolution and Deformation Behavior of Extruded Mg-5Al-0.6Sc Alloy during Room and Elevated Temperature Tension Revealed by Ex-Situ EBSD and VPSC

et al. 2023

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“…In-grain misorientation axes (IGMA) analysis based on EBSD proposed by Chun et al [45,46] is widely used to determine the main deformation mode in deformed grains. Previous reports indicated that the lattice rotation axes corresponding to basal slip, prismatic slip, and pyramidal 〈c+a〉 slip are 〈1 1 00 ̅ 〉, 〈0001〉, and 〈1 100 ̅ 〉 respectively [1,47,48]. The results of IGMA analysis obtained during in-situ tensile for all grains and for only those grains with deviations from the 〈0001〉//TD of 0°-30°, 30°-60°, and 60°-90°are presented in figure 11.…”

Section: Effect Of Grain Orientation On Deformationmentioning

confidence: 90%

In-situ SEM and EBSD investigation of the deformation behavior of extruded Mg-6Al-1Zn-1.1Sc alloy

Zhang,

Wang

et al. 2023

Mater. Res. Express

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The present study subjects the extruded Mg-6Al-1Zn-1.1Sc (wt. %) alloy to reveal the deformation during in-situ tensile at room temperature by scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). The results demonstrate that the parallel slip traces are increasingly observed on the surfaces of grains with increasing strains owing to the movement of dislocations inside the grains toward the sample surface, while microcracks are frequently observed at grain boundaries. The slip trace analysis indicate that many basal slips are activated during the deformation. The twinning behaviors of the extruded alloy during tensile are dominated by extension twinning. The orientation of grains is demonstrated to have a profound effect on their deformation, where grains with orientations deviating greatest from <0001>//TD exhibit the highest dislocation density after deformation. This can be attributed to the fact that these oriented grains are prone to activate basal slip due to the large Schmid factor (SF). Similarly, the deformation of grains is also found to be highly dependent on their size, where the dislocation density of coarser grains increases more significantly than that of finer grains during deformation because coarser grains have greater space available for accommodating dislocations than finer grains.

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“…The results were closely related to HCP crystal structure of α-Mg grain. {001} family of crystal planes was the basal family of slip crystal planes, while {100} and {101} families of crystal planes were cylindrical and bevel family of potential slip crystal planes, and those crystal planes were the main trends of slip motions during plastic deformation at room temperature [17,18]. Therefore, defects formed as priority in those crystal planes under the impact stress during SP treatment.…”

Section: Gradient Micro-nanostructures Of Sp Mg-gd-y Alloymentioning

confidence: 99%

“…Inverse Fourier transform of α-Mg grain in Fig.3(b) showed that there was scarcely any defect in different crystal planes of (0112)、(1102)、(1010), which related to the molding process of Mg-Gd-Y alloy. Magnesium alloy was of HCP crystal structure and slip system was limited[17]. The Mg-Gd-Y alloy substrate ingot employed in the paper was casting molding without deformation process, and there were hardly dislocation and twin, as well as defect in different crystal planes of α-Mg grain.…”

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confidence: 99%

Mechanism of Shot Peening on Microstructure and Fatigue Performance of Mg-Gd-Y Alloy

Wang,

Ma,

Liu

et al. 2024

Preprint

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In order to study the strengthening mechanism of shot peening (SP) on fatigue performance of Mg-Gd-Y alloy, microstructures of Mg-Gd-Y alloy substrate and SP samples were characterized by SEM, TEM and XRD, surface hardness and surface residual stresses were measured by Vickers hardness tester and X-Ray residual stress analysis system, and rotary bending fatigue performance was tested by electro-hydraulic fatigue testing machine. The results showed that, severe plastic deformation occurred on the near-surface of SP sample and produced gradient micro-nanostructure, including nanocrystalline layer, sub-grain layer and deformation layer. The surface hardness increased from 85 HV0.5 of substrate to 136 HV0.5 of SP sample, and the surface residual compressive stress was induced. The high-frequency fatigue strength of SP sample rose to 125 MPa, indicating the significant improvement of fatigue performance of Mg-Gd-Y alloy after SP treatment.

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Quasi in-situ EBSD analysis of twinning-detwinning and slip behaviors in textured AZ31 magnesium alloy subjected to compressive-tensile loading

Cited by 51 publications

References 56 publications

Microstructure Evolution and Deformation Behavior of Extruded Mg-5Al-0.6Sc Alloy during Room and Elevated Temperature Tension Revealed by Ex-Situ EBSD and VPSC

Microstructure Evolution and Deformation Behavior of Extruded Mg-5Al-0.6Sc Alloy during Room and Elevated Temperature Tension Revealed by Ex-Situ EBSD and VPSC

In-situ SEM and EBSD investigation of the deformation behavior of extruded Mg-6Al-1Zn-1.1Sc alloy

Mechanism of Shot Peening on Microstructure and Fatigue Performance of Mg-Gd-Y Alloy

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