Dislocation‐Twin Interactions in Magnesium Alloy AZ31

Wang, Fulin; Agnew, Sean R.

doi:10.1002/9781119093428.ch27

Cited by 3 publications

(2 citation statements)

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“…The basal slip system [0 0 0 1] and <1 1 −2 0> could only be operated when ECAP was in operation [35]. The intensity of the [1 0 1 1] and [1 0 −1 2] planes increased after ECAP, which indicated that the dislocation slip is the main means of deformation during the passes [36,37]. An irreversible dislocation slip can be generated in a crystal structure containing symmetry (HCP) structure, and the samples will deform plastically in this case [38].…”

Section: Xrd Analysismentioning

confidence: 99%

Enhancement of Mechanical Behaviors and Microstructure Evolution of Nano-Nb2O5/AZ31 Composite Processed via Equal-Channel Angular Pressing (ECAP)

et al. 2023

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The automobile industry uses magnesium for load-bearing components due to its low density, durability, and ductility. This study investigated a nanocomposite containing Nb2O5 (3 and 6 wt%) nanoparticles as reinforcement with AZ31 magnesium alloy made by stir casting. A severe plastic deformation was conducted on the cast samples via equal-channel angular pressing (ECAP) after homogenization at 410 °C for 24 h and aging at 200 °C for 10 h. The microstructural distributions and mechanical properties of the magnesium metal matrix composites (MMCs) reinforced with Nb2O5 nanoparticles were investigated via ECAP. With the increase in the number of ECAP passes, the grain sizes became uniform, and the size of secondary phases reduced in the pure Nb2O5/AZ31 MMC. The grain size decreased remarkably after the ECAP process from 31.95 µm to 18.41µm due to the dynamic recrystallization during plastic deformation. The mechanical properties of hardness, ultimate tensile strength, and elongation effectively improved after each ECAP pass. The maximum values achieved for the Nb2O5/AZ31 composite subjected to ECAP were 64.12 ± 12 HV, 151.2 MPa, and 52.71%.

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Section: Xrd Analysismentioning

confidence: 99%

Enhancement of Mechanical Behaviors and Microstructure Evolution of Nano-Nb2O5/AZ31 Composite Processed via Equal-Channel Angular Pressing (ECAP)

et al. 2023

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“…Basal slip activity is dominant when twin volume fraction is low, and it drops in favor of pyramidal slip as twin grows.Viscoplastic self-consistent (VPSC)(Proust et al, 2009) and elastoplastic self-consistent (EPSC) (Juan et al, 2014) polycrystal models predicted that pyramidal slip activity inside twin commences near the end of the plateau regime (~4% strain), and increases rapidly before reaching steady state at higher strains. In a previous study, we examined some of the dislocation structures near the 1012 twin boundary in both matrix and twin at 2% RD compressed material(Wang and Agnew, 2015). While the matrix contains mostly 〈$〉 dislocations and rarely (containing dislocations, abundant ( -containing dislocations were surprisingly common in the twin, even at such low stress level, and it was thus suggested that they are the product of dislocation transmutation reactions.In this study, samples compressed along RD up to 2% true strain were selected, in order to pursue the origin of the ( -containing dislocations and the activity of pyramidal slip systems inside tension twins.3.4.1 Dislocations near the 1012 twin boundary from the perspective of NDCharacterization was performed firstly from the ND perspective, where the basal plane in the matrix and the prismatic plane in the twin are close to face-on orientation, and the twinning plane is inclined(Figure 3.3b).…”

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Dislocation Interactions with (101̅2) Twin Boundary in Mg

Wang

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1012 twinning is an important deformation mechanism of Mg alloys and, in fact, the most common twinning mode in all hexagonal metals. Under appropriate loading, these twins grow pervasively, consuming large volume fractions of the material while the migrating twin boundaries (TBs) undergo extensive interactions with dislocations. As such, the deformation behavior of the twins can dominate the subsequent stress-strain response of the polycrystalline aggregate. The present work focuses on investigating the interactions between basal dislocations within the surrounding matrix and 1012 TBs, with the ultimate aim of understanding the influences these interactions have on defects within the twin and on TB migration. The

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Influence of Wavy Bending on Microstructure and Mechanical Properties of a Rolled AZ31 Sheet

Liu

Zhang

Chen

et al. 2020

Metals

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In the present work, cross-wavy bending at room temperature was carried out to tailor the microstructure and stretch formability of rolled AZ31 sheets. Wavy bending processing generates profuse {10–12} twins and a tilt basal texture. Subsequent recrystallization annealing causes grain coarsening and enhances the intensity of twin-orientation. The combined use of wavy bending and annealing can maintain high tensile ductility and remarkably enhances the stretch formability of rolled AZ31 sheet. It can be mainly attributed to the non-basal texture in the wavy bent sheet which increases the thinning capability during in-plane tension.

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Dislocation‐Twin Interactions in Magnesium Alloy AZ31

Cited by 3 publications

References 21 publications

Enhancement of Mechanical Behaviors and Microstructure Evolution of Nano-Nb2O5/AZ31 Composite Processed via Equal-Channel Angular Pressing (ECAP)

Enhancement of Mechanical Behaviors and Microstructure Evolution of Nano-Nb2O5/AZ31 Composite Processed via Equal-Channel Angular Pressing (ECAP)

Dislocation Interactions with (101̅2) Twin Boundary in Mg

Influence of Wavy Bending on Microstructure and Mechanical Properties of a Rolled AZ31 Sheet

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