Effect of circumferential strain rate on dynamic recrystallization and texture of Mg-13Gd-4Y-2Zn-0.5Zr alloy during rotary backward extrusion

Meng, Yingze; Yu, Jianmin; Zhang, Guanshi; Wu, Yuna; Zhang, Zhimin; Shi, Zheng

doi:10.1016/j.jma.2019.12.012

Cited by 49 publications

(8 citation statements)

References 43 publications

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“…It can be seen that the texture intensities of both unDRXed grains and DRXed grains in AZ31-A/G/A and AZ31-A/G are higher than those in monolithic AZ31, further indicating that co-extrusion can weaken the texture of AZ31 component in bimetallic composite plates. In addition, the texture intensity of DRXed microstructure is lower than that of unDRXed microstructure, indicating that the DRX can reduce the texture strength of AZ31, which is consistent with the fact that DRXed grains can promote the random development of grain orientation, as mentioned in previous literature [17,30]. As shown in Fig.…”

Section: Effect Of Co-extrusion On Texture Of Az31supporting

confidence: 90%

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Effect of Extrusion Combination Types on Microstructure and Mechanical Properties of the AZ31/GW103K Bimetallic Composite Plates

Meng

Lin

Wang

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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The AZ31/GW103K bimetallic composite plates were prepared by co-extrusion of diff erent combination types (sandwich extrusion type and double semicircle extrusion type), and eff ects of diff erent extrusion combination types on the microstructure and mechanical properties of bimetallic composite plates were systematically investigated. The results show that both the AZ31/GW103K bimetallic composite plates prepared by diff erent extrusion combination types have good metallurgical bonding, and changing the combination type does not aff ect the thickness of the interfacial transition layer of composite plates. Compared with the monolithic AZ31 and GW103K extruded plates, co-extrusion can promote the dynamic recrystallization (DRX) of AZ31 and GW103K components in composite plates, and double semicircular extrusion type has a better promotion eff ect on the DRX than sandwich extrusion type. In addition, the texture of AZ31 in both monolithic AZ31 and AZ31/GW103K/AZ31 (A/G/A) plates is a typical (0002) basal texture, while that in the AZ31/GW103K (A/G) composite plate shifts to the tangent direction (TD) of extruded plate. Compared with the monolithic AZ31 extruded plate, both the yield strength and tensile strength of A/G and A/G/A bimetallic composite plates are signifi cantly improved. The strength of A/G/A composite plate is higher than that of A/G composite plate, but its elongation is worse. Meanwhile, co-extrusion reduces the dislocation density of AZ31 and GW103K components in composite plates, and diff erent extrusion combination types also aff ect the dislocation density.

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Section: Effect Of Co-extrusion On Texture Of Az31supporting

confidence: 90%

“…Figure 7 shows grain boundary maps and misorientation angle distribution (MAD) figures of AZ31 in different extruded plates. Considering the orientation difference angle less than 2° is usually caused by the instrument error, so they are not counted in the statistics [17]. As shown in Fig.…”

Section: Microstructure and Texturementioning

confidence: 99%

Effect of Extrusion Combination Types on Microstructure and Mechanical Properties of the AZ31/GW103K Bimetallic Composite Plates

Meng

Lin

Wang

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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“…This indicates that both the CDRX mechanism and the DDRX mechanism were present during the hot deformation. The evolution of this mechanism has been reported in magnesium alloys prepared by extrusion and other methods [ 26 , 27 ].…”

Section: Discussionmentioning

confidence: 96%

Effect of Deformation Parameters on Recrystallization Behavior and Long-Period Stacking-Ordered Phase of Mg-9Gd-4Y-2Zn-0.5Zr Alloy

et al. 2022

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In this study, a Mg-9Gd-4Y-2Zn-0.5Zr (wt.%) alloy was subjected, after solution treatment, to hot compression deformation at different temperatures (350 °C, 400 °C and 450 °C) and different strain rates (0.001 s−1, 0.01 s−1, 0.1 s−1 and 0.5 s−1) on a Gleeble-3800 thermal simulator. The evolution of the stress–strain curves under different conditions was compared. The changes in microstructure caused by the different deformation parameters and the change law of the long-period stacking-ordered (LPSO) phase during compression were observed and analyzed by optical microscope (OM) and scanning electron microscope (SEM). The results show that with the increase in the deformation temperature and the decrease in the strain rate, the degree of dynamic recrystallization (DRX) gradually increased, and the morphology of the phase also changed through, for example, twist fracture. The continuous dynamic recrystallization (CDRX) and discontinuous dynamic recrystallization (DDRX) mechanisms activated during the thermal deformation process can effectively refine the grains and weaken the texture in the alloy.

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“…The grains are equiaxed, with average grain size about 92 μm. There are different forms of LPSO phase in the Mg-Gd-Y-Zn-Zr alloy [27]. The thin straight stripe-like lamellar phase are inside the grains.…”

Section: Initial Microstructurementioning

confidence: 99%

“…However, these deformations usually result in strong deformation textures and slight grain refinement effect, they are difficult to meet the high requirements. Researchers have found that severe plastic deformation (SPD) with shear stress deformation can significantly optimize these problems [25][26][27][28]. This kind of SPD process usually puts the alloy under complex stress state, and the effect of complex stress on the material is often difficult to distinguish clearly.…”

Section: Introductionmentioning

confidence: 99%

Effect of shear stress and compressive stress deformation on LPSO phase kink behavior of Mg-Gd-Y-Zn-Zr alloy

Meng

Yu³

et al. 2022

Mater. Res. Express

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Using torsion and compression experiments, the kink behavior of the long period stacking ordered (LPSO) phase under different stress deformation of the Mg-13Gd-4Y-2Zn-0.5Zr alloy were studied. The results show that different stress states have different effects on the kink of LPSO phase. The grain deformation of the shear stress deformed (SSD) alloy is relatively weak, where LPSO phases are mostly C-shaped or S-shaped kinks. The kink forms can be divided into parallel kinks and angular kinks. The grains of compressive stress deformed (CSD) alloy are significantly elongated and perpendicular to the compression direction, in which occur more Z-shaped zigzag kinks. The kink angle and kink times of the shear stress deformed alloy are small, while the relative kink width is larger. There are large number kink bands during compressive stress deformation, almost all of which are distributed in perpendicular to the compression direction. The difference in the kink behavior is due to the non-basal slip of SSD is easy to active, while in the CSD alloy, the non-basal slip is relatively difficult to active, resulting in more dislocation pile-up. Different forms of kinks can release stress concentration, and all of kinks make the grains deflect in the direction with higher non-basal slip schmid factor.

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Effect of circumferential strain rate on dynamic recrystallization and texture of Mg-13Gd-4Y-2Zn-0.5Zr alloy during rotary backward extrusion

Cited by 49 publications

References 43 publications

Effect of Extrusion Combination Types on Microstructure and Mechanical Properties of the AZ31/GW103K Bimetallic Composite Plates

Effect of Extrusion Combination Types on Microstructure and Mechanical Properties of the AZ31/GW103K Bimetallic Composite Plates

Effect of Deformation Parameters on Recrystallization Behavior and Long-Period Stacking-Ordered Phase of Mg-9Gd-4Y-2Zn-0.5Zr Alloy

Effect of shear stress and compressive stress deformation on LPSO phase kink behavior of Mg-Gd-Y-Zn-Zr alloy

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