Material properties under drawing and extrusion with cyclic torsion

Kong, Lingxue; Lin, L.; Hodgson, Peter

doi:10.1016/s0921-5093(00)01971-7

Cited by 20 publications

(5 citation statements)

References 7 publications

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“…In cyclic methods of deformation, the diffusion of vacancies became quicker, resulting in the annihilation of edge dislocations by climb. In the result, the achievable saturation dislocation density is usually lower in cyclic methods of deformation than in monotonic [17,27].…”

Section: Introductionmentioning

confidence: 99%

Microstructure characterization of ultrafine grained Cu alloys processed by methods with cyclic scheme of deformation

Rodak¹

2018

MATERIAL ENGINEERING

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COT (compression with oscillatory torsion) is a simple process that has the ability to deform bulk metallic samples. Performed investigations show that this method of deformation leads to grain refinement of Cu-Cr and Cu-Fe alloys. The grain size obtained via the dislocation subdivision mechanism associated with generation of non-equilibrum grain boundaries is in the UFG range. Large fraction of grain boundaries have low angles of misorientation. The limitation of the grain refinement and creation of low angles boundaries can be attributed to the extensive dynamic recovery. However, recrystallization process and deformation twinning plays a crucial role in grain refinement resulting in grain refinement to the nanoscale. The present overview shows that many structural elements accompanying formation UGF structure influence on understanding of the microstructure-properties relationship in these materials.

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Section: Introductionmentioning

confidence: 99%

Microstructure characterization of ultrafine grained Cu alloys processed by methods with cyclic scheme of deformation

Rodak¹

2018

MATERIAL ENGINEERING

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“…The experimental results confirmed that the die or punch as it rotated, its extrusion force dropped, and as the material was twisted by the rotation of the die, the shear strain was created in the process. Kong et al [3] experiments of extrusion and drawing processes were carried out with or without swing dies. It was especially observed that the extrusion load tended to stabilize after the punch stroke traveled a certain distance during the swing die.…”

Section: Introductionmentioning

confidence: 99%

FEM simulation optimization and slab method on rotating extrusion of thin-walled round tube under constant shear friction

Chang,

Huang,

Teng

et al. 2023

J. Phys.: Conf. Ser.

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This research considering constant shear friction is to explore the rotating extrusion of thin-walled round tube based on FEM simulation and slab method, and compares the results of both models to realize the variations and acceptance. The effective stress, the effective strain, the velocity field, the average thickness, the extrusion force, and the extrusion torque can be obtained from this study. It reveals the average thickness obtained from rotating extrusion is more uniform than that obtained from no rotating extrusion. The FEM optimization for extrusion force can be combined with Taguchi method, the L934 orthogonal table considers the four control factors which are outer diameter to thickness ratio, frictional factor, rotating angular velocity, half die angle, and three levels. The ranking of influence factors and the optimization combination can be obtained from FEM simulation optimization. Eventually the extrusion force between FEM simulation and slab method is compared under rotating angular velocity, 0.2 rad/s, the maximum error is 10.49 % and the minimum error is -0.29%; the average error is 4.16%, so the trend is in good agreement each other. Therefore, the both models can be verified.

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“…However, there is a limitation during the extrusion process, because the larger the extrusion, the more massive the equipment that is required. Therefore, some extrusion methods with the introduction of torsional deformation have attracted the attention of more and more scholars [ 27 , 28 , 29 , 30 , 31 ]. The working principle of rotating extrusion deformation is that a die is rotated during the hot extrusion process in order to reduce the forming load and accumulate strain at the same time.…”

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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Material properties under drawing and extrusion with cyclic torsion

Cited by 20 publications

References 7 publications

Microstructure characterization of ultrafine grained Cu alloys processed by methods with cyclic scheme of deformation

Microstructure characterization of ultrafine grained Cu alloys processed by methods with cyclic scheme of deformation

FEM simulation optimization and slab method on rotating extrusion of thin-walled round tube under constant shear friction

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

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