Mechanism of plasticity enhancement of AZ31B magnesium alloy sheet by accumulative alternating back extrusion

Wang, Ye; Feng, Liqiang; Bian, Nan; Du, Hua Qiu; Huo, Peng Da

doi:10.1016/j.jma.2021.08.035

Cited by 31 publications

(7 citation statements)

References 36 publications

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“…In Fig. 3d, g combined with f, i the grain orientation is mainly concentrated in the direction of [1][2][3][4][5][6][7][8][9][10]. As shown in Fig.…”

Section: Microstructurementioning

confidence: 75%

“…However, Wang et al [8] reported that the traditional plastic processing method easily makes the magnesium alloy show a strong basal texture, which could limit its development and application [9]. Sagapuram et al [10] realized the regulation of magnesium alloy sheet texture through shear-based deformation processing. Tilted-basal textures, wherein the basal poles are inclined from the sheet surface normal, are achieved by this processing.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Recrystallization Mechanism and Texture Evolution during Interactive Alternating Extruded Magnesium Alloy

Gao

Feng

et al. 2023

Acta Metall. Sin. (Engl. Lett.)

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Alternating extrusion (AFE) is a new way to effectively alter the texture and enhance the mechanical properties of the extruded bars. However, the mechanisms of microstructure evolution and enhancement of hardness are still unknown by different extrusion ratios (ERs) during extrusion. This work systematically investigated the microstructure and hardness of AZ31 alloy with various extrusion ratios of 8.1, 15.6, and 24.8 by electron backscattered diffraction. The most striking result to emerge from the data is that when the ERs were increased from 8.1 to 15.6, the grain size was refined to 7.13 μm. However, when the ER reached 24.8, the average grain size was 11.43 μm. The proportion of recrystallization was only 2.92%, there was a continuous rotation of sub-grains at coarse grain boundaries, and non-basal slip < a > dislocations were activated and enriched near low-angle grain boundaries. At present, the recrystallization has not been completed. The grains of the product are coarsened, and the hardness is reduced. When λ = 15.6, the AFE has a significant grain refinement effect and the highest hardness value.

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“…In Fig. 3d, g combined with f, i the grain orientation is mainly concentrated in the direction of [1][2][3][4][5][6][7][8][9][10]. As shown in Fig.…”

Section: Microstructurementioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Dynamic Recrystallization Mechanism and Texture Evolution during Interactive Alternating Extruded Magnesium Alloy

Gao

Feng

et al. 2023

Acta Metall. Sin. (Engl. Lett.)

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“…Wang et al [ 21 ] described the effect of accumulative alternating indirect extrusion on the mechanical properties of commercial AZ31 alloy and stated that after accumulative alternating indirect extrusion, the grain of the extrusion sheet was significantly refined. With the number of extrusion cycles increased from 2:1 to 4:1, dislocations with a high density increased the proportion of DRX.…”

Section: Magnesium Alloy Extrusion Process and Advantagesmentioning

confidence: 99%

Research Progress on Microstructure Evolution and Strengthening-Toughening Mechanism of Mg Alloys by Extrusion

et al. 2023

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Magnesium and magnesium-based alloys are widely used in the transportation, aerospace and military industries because they are lightweight, have good specific strength, a high specific damping capacity, excellent electromagnetic shielding properties and controllable degradation. However, traditional as-cast magnesium alloys have many defects. Their mechanical and corrosion properties cause difficulties in meeting application requirements. Therefore, extrusion processes are often used to eliminate the structural defects of magnesium alloys, and to improve strength and toughness synergy as well as corrosion resistance. This paper comprehensively summarizes the characteristics of extrusion processes, elaborates on the evolution law of microstructure, discusses DRX nucleation, texture weakening and abnormal texture behavior, discusses the influence of extrusion parameters on alloy properties, and systematically analyzes the properties of extruded magnesium alloys. The strengthening mechanism is comprehensively summarized, the non-basal plane slip, texture weakening and randomization laws are comprehensively summarized, and the future research direction of high-performance extruded magnesium alloys is prospected.

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“…As shown in Figure 5a, coarse grains induced by homogenized treatment were not refined and a large number of dynamic recrystallized (DRX) fine grains formed along the GBs and inner of coarse grains. Some sub-grain boundaries (sub-GB) with a disorientation angle exceeding 2 • can be clearly seen in the coarse grains which will promote the DRX process by absorbing the dislocation during the deformation [9,49]. Due to the presence of a high density of dislocations, internal grain disorientation appears to result in the variation in color of the IPF maps.…”

Section: Microstructure Evolutionmentioning

confidence: 99%

The Effect of Rotary-Die Equal-Channel Angular Pressing Process on the Microstructure, the Mechanical and Friction Properties of GW103 Alloy

et al. 2022

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In this study, the effect of rotary-die equal-channel angular pressing (RD-ECAP) on the microstructure and texture evolution of GW103 alloy is studied. RD-ECAP processes were carried out for 1, 4 and 12 passes at 450 °C. The mechanical properties and friction behavior of RD-ECAP-processed Mg-10Gd-3Y (wt%) alloy (GW103) are discussed. The results reveal that the size of dynamic recrystallized grains and second-phase particles are significantly refined to about 1.3 μm and 1 μm, respectively. The texture evolution of the processed samples is studied by X-ray diffraction and electron backscattered diffraction techniques. The multiple texture components formed are not observed after the conventional ECAP process. Moreover, different dynamic recrystallization (DRX) mechanisms are systemically analyzed and discussed in view of the texture evolution of ECAP processed samples. The final textures obtained after 12 passes are identified as two types: The C-texture type induced by continuous and discontinuous DRX, and the random texture components induced by reorientation of the initial <101¯0> fiber. Based on the grain refinement, precipitate strengthening and texture weakening mechanisms, a high-performance ternary alloy of Mg-Gd-Y was firstly obtained through 12 passes RD-ECAP processing, with a combination of high yield strength of 312 MPa and a high ductility of 22%. In addition, the friction behaviors are also studied. The multi-pass-processed samples exhibit a relatively lower friction coefficient under a load of 10 N at room temperature.

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Mechanism of plasticity enhancement of AZ31B magnesium alloy sheet by accumulative alternating back extrusion

Cited by 31 publications

References 36 publications

Dynamic Recrystallization Mechanism and Texture Evolution during Interactive Alternating Extruded Magnesium Alloy

Dynamic Recrystallization Mechanism and Texture Evolution during Interactive Alternating Extruded Magnesium Alloy

Research Progress on Microstructure Evolution and Strengthening-Toughening Mechanism of Mg Alloys by Extrusion

The Effect of Rotary-Die Equal-Channel Angular Pressing Process on the Microstructure, the Mechanical and Friction Properties of GW103 Alloy

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