Refining the microstructure and modifying the texture of the AZ80 alloy cylindrical tube by the rotating backward extrusion with different rotating revolutions

Dong, Beibei; Che, Xin; Wang, Qiang; Meng, Ming; Gao, Ziwen; Ma, Jian‐Nong; Yang, Fulai; Zhang, Zhiming

doi:10.1016/j.jallcom.2020.155442

Cited by 39 publications

(14 citation statements)

References 40 publications

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“…When the whole RBE process was finished, the RBE specimens were immediately quenched in air to retain the high temperature deformation microstructure. In our previous research [ 1 ], it could be found that the rotating speeds of the RBE specimens were 0.079, 0.785, and 1.57 rad/s, respectively, which corresponded to rotating revolutions of n = 5, n = 10, and n = 50.…”

Section: Methodsmentioning

confidence: 98%

“…Magnesium (Mg) alloys have an important application prospect in many fields, owing to their low density, high specific strength, and good damping [ 1 , 2 , 3 , 4 ]. However, Mg alloys usually exhibit a poor ductility and forming ability at an ambient temperature because of the special hexagonal close-packed (HCP) structure [ 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, we have developed a new SPD technique titled rotating backward extrusion (RBE), which can produce ultra-fine grain (UFG) parts [ 1 , 19 , 20 ]. The RBE process is characterized by the rotation of an open punch during the thermal extrusion process, which can reduce the extrusion load and produce a large accumulative plastic strain through single pass deformation.…”

Section: Introductionmentioning

confidence: 99%

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An Investigation on the Microstructure and Texture of an AZ80 Cup-Shaped Piece Processed by Rotating Backward Extrusion

Che

Dong

et al. 2020

Materials

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The rotating backward extrusion (RBE) process, as a new severe plastic deformation (SPD) process, is based on conventional backward extrusion and rotation, which meets the requirement of modern industrial development with its high performance and production efficiency. However, there is little research on the microstructure evolution and texture modification of the RBE process. Thus, in this study, the effect of different rotating revolutions, e.g., n = 5, n = 10, and n = 50, on the microstructure and texture development for the RBE process based on the AZ80 magnesium (Mg) alloy were investigated at 653 K. The results disclose that the rotating revolution is an influencing processing parameter on the deformation of the RBE process. The grain refining ability is enhanced with the increase of the rotating revolutions, and the minimum grain size of the cup bottom, shearing zone, and cup wall can reach to 16.7 μm, 15.6 μm, and 13.0 μm, respectively, under the condition of n = 50. Furthermore, with the increase in the rotating revolutions, the microstructure of the alloy becomes more uniform and the proportion of dynamic recrystallization (DRX) is also increased. The maximum DRX fractions of the sample for the cup bottom and cup wall are 95.4% and 86.8%, respectively, at n = 50. The DRX mechanism of the RBE process is determined by the continuous DRX and discontinuous DRX. In addition, the texture can be significant weakened during the RBE process, especially at the cup bottom, where the maximum pole intensity can be reduced from 17.6 at n = 10 to 6.5 at n = 50, which can be attributed to the higher proportion of new DRXed grains whose orientations are more random compared with the deformed grains.

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Section: Methodsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Investigation on the Microstructure and Texture of an AZ80 Cup-Shaped Piece Processed by Rotating Backward Extrusion

Che

Dong

et al. 2020

Materials

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“…The results indicated that the KOBO process can signi cantly improve the mechanical properties and re ne the grains. Wang [35][36][37] et al developed rotating backward extrusion (RBE) process which incorporate rotation with the conventional backward extrusion (CBE), and investigated the metal ow behavior and strain distribution in nite element simulation. The results showed that effective strain distribution and deformation uniformity could be improved because of the additional shear deformation.…”

Section: Introductionmentioning

confidence: 99%

Novel process combined extrusion and severe plastic deformation for plate component with rib-web structure of magnesium alloys

Zhu

Sun

Qian

et al. 2022

Int J Adv Manuf Technol

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Plates with rib-web structure of magnesium alloys can hardly fabricated through conventional method. In this work, the variable circular channel angular extrusion (VCCAE) combined extrusion and severe plastic deformation is proposed, in which billet undergoes severe deformation at several variable circular angular channel. The FE model for VCCAE of scaling plate with ribs is established and the experimental set up is designed. The feasibility of the novel process and the accuracy of the FE model are validated by the simulations and experiments. Stress state and the effective strain distribution in longitudinal section and cross section are analyzed. The results show that stress and strain distribution in longitudinal section is extremely inhomogeneous, and obvious stress concentration at the shear plane is founded. The microstructure in angular region is more uniform and ner, which validate that the severe shear deformation induced by the angular channel in the VCCAE process could promote the deformation uniformity and grain re nement. The results of numerical simulation and experiments demonstrate that the VCCAE process proposed in this paper is feasible and it has great potential to manufacture highperformance plate with ribs.

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“…In addition, compared to the traditional extrusion technique, the same strain could be achieved by single pass via the rotating extrusion method. Dong et al [ 32 ] reported the microstructure and the texture evolution of AZ80 alloy cylindrical tube by RBE with different rotating revolutions, and found that the average grain size was decreased and the proportion of dynamic recrystallization (DRX) was increased gradually with the increase in rotating revolutions. Che et al [ 16 ] studied the effect of processing parameters of a cup-shaped AZ80 Mg alloy via the RBE method; the microstructure and texture evolution were investigated simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Dynamic Recrystallization Behavior of Mg-Gd-Y-Zn-Zr Alloy during Rotating Backward Extrusion

Duan

Dong

et al. 2022

Materials

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Rotating backward extrusion (RBE) is one of severe plastic deformation (SPD) methods used to produce cylindrical components with a very large strain by a single pass. In this study, the microstructure and texture evolution in the different regions of Mg-12Gd-4Y-2Zn-0.5Zr (wt.%) alloys via RBE process were investigated by using optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM) and electron back-scatter diffraction (EBSD). The results showed that the cup-shaped sample formed by RBE process exhibited typical gradient microstructure expanding from its inner wall to outer wall along the radial direction (RD). The average grain size of the RBEed sample decreased when the radius decreased from the edge region to the center region along the RD, which was attributed to the different strains and strain rates in the different regions. It also could be observed that the center region showed highest deformation and the edge region exhibited the lowest deformation in the RBEed sample along the RD. In addition, the grain refinement mechanisms of the experimental alloy containing long-period stacking ordered (LPSO) phases after RBE with 100 N were continuous dynamic recrystallization (CDRX), discontinuous dynamic recrystallization (DDRX) and particle stimulated nucleation (PSN).

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Refining the microstructure and modifying the texture of the AZ80 alloy cylindrical tube by the rotating backward extrusion with different rotating revolutions

Cited by 39 publications

References 40 publications

An Investigation on the Microstructure and Texture of an AZ80 Cup-Shaped Piece Processed by Rotating Backward Extrusion

An Investigation on the Microstructure and Texture of an AZ80 Cup-Shaped Piece Processed by Rotating Backward Extrusion

Novel process combined extrusion and severe plastic deformation for plate component with rib-web structure of magnesium alloys

Microstructure Evolution and Dynamic Recrystallization Behavior of Mg-Gd-Y-Zn-Zr Alloy during Rotating Backward Extrusion

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