Unveiling the formation of basal texture variations based on twinning and dynamic recrystallization in AZ31 magnesium alloy during extrusion

Jiang, Mo; Xu, Chao; Yan, Hong; Fan, Guohua; Nakata, T.; Lao, Changshi; Chen, R.S.; Kamado, Shigeharu; Han, En‐Hou; Lu, Boxin

doi:10.1016/j.actamat.2018.07.014

Cited by 424 publications

(75 citation statements)

References 81 publications

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“…It is reasonable to believe that the misorientation angle of subgrain boundaries would continually increase and then become new refined grains if reheating treatment went on. Unlike continuous dynamic recrystallization which produced nucleus rotated 28° along

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direction from its parents, the “continuous” static recrystallization (cSRX) did not largely change the orientations of nucleus from their parent. The orientations of subgrains belonging to G1–G3 were plotted in (0002) pole figures in Figure d.…”

Section: Discussionmentioning

confidence: 99%

Tailoring the Rolling Texture of AZ31 Mg Alloy with Calcium and Tin Addition

et al. 2019

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A small amount of Ca and Sn is added into AZ31 alloy separately to modify its deformation behavior and optimized rolling texture. Results show that addition of Sn increases the activation of twinning in AZ31. Some unusual double twins, inducing {101¯2}‐true{10true1¯2true} and {101¯3}‐true{10true1¯2true} double twins, are activated in AZ31–0.5Sn alloy. Refined grains with similar orientation as their parents are produced by continuous static recrystallization, which limits texture modification in AZT310. Ca gives rise to a remarkable grain refinement during hot rolling. Recrystallized grains in AZX310 exhibit a weaker double peak texture with a wide orientation spread. It is found that Al2Ca particles simulate recrystallized nucleation and some of these refined grains exhibit non‐basal orientations. Primary compression twins are favorable nucleation sites for recrystallization and they are more effective in texture modification compared to other double twins.

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true〈 0001 true〉

Section: Discussionmentioning

confidence: 99%

Tailoring the Rolling Texture of AZ31 Mg Alloy with Calcium and Tin Addition

et al. 2019

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“…In Mg alloys, it is well known that the critical resolved shear stress (CRSS) required for pyramidal <c + a> slip system at room temperature is~100 times larger than that for the basal slip system. However, the possibility of pyramidal <c + a> slip activation is greatly increased at elevated temperatures owing to the fact that the activation of slip in the pyramidal plane is more energetically beneficial [26,27]. Hence, similar to the formation mechanism of shear texture, the pyramidal <c + a> slip promoted the rotation of the grain pyramidal planes aligned to the geometric shear plane [25], which can effectively split the typical shear texture into distinct parts, and thus greatly weaken the texture intensity, as shown in this extrusion process.…”

Section: Effect Of Extrusion On Microstructure and Texturementioning

confidence: 99%

Microstructure Evolution and Mechanical Properties of AZ80 Mg Alloy during Annular Channel Angular Extrusion Process and Heat Treatment

Zhao

Yan

et al. 2019

Materials

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Microstructure evolution and mechanical properties of AZ80 Mg alloy during annular channel angular extrusion (350 °C) and heat treatment with varying parameters were investigated, respectively. The results showed that dynamic recrystallization of Mg grains was developed and the dendritic eutectic β-Mg17Al12 phases formed during the solidification were broken into small β-phase particles after hot extrusion. Moreover, a weak texture with two dominant peaks formed owing to the significant grain refinement and the enhanced activation of pyramidal <c + a> slip at relative high temperature. The tension tests showed that both the yield strength and ultimate tensile strength of the extruded alloy were dramatically improved owing to the joint strengthening effect of fine grain and β-phase particles as compared with the homogenized sample. The solution treatment achieved the good plasticity of the alloy resulting from the dissolution of β-phases and the development of more equiaxed grains, while the direct-aging process led to poor alloy elongation as a result of residual eutectic β-phases. After solution and aging treatment, simultaneous bonding strength and plasticity of the alloy were achieved, as a consequence of dissolution of coarse eutectic β-phases and heterogeneous precipitation of a large quantity of newly formed β-phases with both the morphologies of continuous and discontinuous precipitates.

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“…A high flow stress state can be expressed by using equation (1), and a low flow stress state can be expressed by using equation (2).…”

Section: Constitutive Modelmentioning

confidence: 99%

“…However, as a widely used light metal, magnesium alloy has a complex nucleation mechanism. Considering the nucleation and growth characteristics of magnesium alloys, the recrystallization mechanism includes two categories [1,2]: continuous dynamic recrystallization (CDRX) and discontinuous dynamic recrystallization (DDRX). CDRX forms near the grain boundary, where stress concentration is high and proceeds with small-angle grain boundary networks, which are called subgrains and that migrate and merge to form new large-angle grains.…”

Section: Introductionmentioning

confidence: 99%

Recrystallization Microstructure Prediction of a Hot‐Rolled AZ31 Magnesium Alloy Sheet by Using the Cellular Automata Method

Chen

Zhao

et al. 2019

Mathematical Problems in Engineering

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A large reduction rolling process was used to obtain complete dynamic recrystallization (DRX) microstructures with fine recrystallization grains. Based on the hyperbolic sinusoidal equation that included an Arrhenius term, a constitutive model of flow stress was established for the unidirectional solidification sheet of AZ31 magnesium alloy. Furthermore, discretized by the cellular automata (CA) method, a real-time nucleation equation coupled flow stress was developed for the numerical simulation of the microstructural evolution during DRX. The stress and strain results of finite element analysis were inducted to CA simulation to bridge the macroscopic rolling process analysis with the microscopic DRX activities. Considering that the nucleation of recrystallization may occur at the grain and R-grain boundary, the DRX processes under different deformation conditions were simulated. The evolution of microstructure, percentages of DRX, and sizes of recrystallization grains were discussed in detail. Results of DRX simulation were compared with those from electron backscatter diffraction analysis, and the simulated microstructure was in good agreement with the actual pattern obtained using experiment analysis. The simulation technique provides a flexible way for predicting the morphological variations of DRX microstructure accompanied with plastic deformation on a hot-rolled sheet.

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Unveiling the formation of basal texture variations based on twinning and dynamic recrystallization in AZ31 magnesium alloy during extrusion

Cited by 424 publications

References 81 publications

Tailoring the Rolling Texture of AZ31 Mg Alloy with Calcium and Tin Addition

Tailoring the Rolling Texture of AZ31 Mg Alloy with Calcium and Tin Addition

Microstructure Evolution and Mechanical Properties of AZ80 Mg Alloy during Annular Channel Angular Extrusion Process and Heat Treatment

Recrystallization Microstructure Prediction of a Hot‐Rolled AZ31 Magnesium Alloy Sheet by Using the Cellular Automata Method

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