Effect of extrusion ratios on microstructural evolution, textural evolution, and grain boundary character distributions of pure copper tubes during hydrostatic extrusion

Lee, Jong-Beom; Jeong, Hye-Jin; Park, Sang Yong

doi:10.1016/j.matchar.2019.109941

Cited by 15 publications

(7 citation statements)

References 31 publications

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“…The YS and UTS of the rolled copper sheets increased steeply with an increase in the RSR up to 2.0, followed by a sharp decrease when the roll speed ratio was increased to 3.0. The strength drop phenomenon has previously been documented for copper tubes hydrostatically extruded at a high extrusion ratio [20,21].…”

Section: Resultsmentioning

confidence: 80%

“…In contrast with the ND plane, the fraction of misorientations with a lower angle largely decreased in the TD plane. It is proposed herein that the presence of both Σ3-type and Σ9-type twin boundaries at RSR=3 (figure 3(c)), the so-called coincidence site lattice (CSL) boundary, might demonstrate recovery because the CSL boundaries are simplified due to merging of closest-neighbor atoms by the heat generated during severe plastic deformation [20,32]. In this study, the temperature of the surface of the copper sheets increased from ∼15 °C for the as-received samples to ∼55 °C for the sample rolled at RSR=3.…”

Section: Discussionmentioning

confidence: 99%

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Mechanical properties, microstructure, and texture evolution of copper sheets subjected to differential speed rolling process

Lee¹,

Jeong²,

Lee³

et al. 2022

Mater. Res. Express

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Copper sheets were subjected to differential speed rolling (DSR) at roll speed ratios (RSRs) from 1 to 3. The effects of the RSR on the yield strength, uniform strain, microstructure, and texture evolution in the copper sheets were investigated. The grain refinement and uniformity were obviously enhanced, the yield strength and uniform strains increased slightly, and the shear texture components were further widely distributed when the RSR was increased up to 2. At RSR=3, the yield strength decreased, with a distinct increase in the uniform strains due to dynamic recovery and recrystallization as a result of the steep reduction in the geometrically necessary dislocation (GND) density and the grain orientation spread (GOS), thereby increasing the work hardening coefficient (n) and decreasing the work hardening rate (θ).

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Section: Resultsmentioning

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Mechanical properties, microstructure, and texture evolution of copper sheets subjected to differential speed rolling process

Lee¹,

Jeong²,

Lee³

et al. 2022

Mater. Res. Express

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“…The Nb tube strains were varied from 0.8 to 1.7. The ram diameter was 150 mm and the ram speed was 0.2 mm/s [14].…”

Section: Methodsmentioning

confidence: 99%

Effect of strains on textural evolution of hydrostatically extruded niobium tubes

Lee

Park

Jeong

2020

Materials Science and Technology

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The influence of tube strains on tube deformation ratios and textural evolution during the deformation of pure Nb tubes subjected to hydrostatic extrusion was investigated. The tube deformation ratios increased with increasing tube strains. A very strong <111> fibre texture at a lower strain transformed to a dual strong <100> and weak <111> fibre texture at a higher strain. The texture evolution led to an increase in the Taylor factor at the drawing tensor.

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“…According to the Hall-Petch relationship, the hardness of the material is inversely proportional to the grain size. 22 The main reason why the microhardness of the material surface is not the largest may be that the large amount of energy produced by severe plastic deformation, which is produced in the form of heat release on the surface, resulting in the recrystallization of the surface. 23 During the USRP, the surface layer of the material is subjected to repeat ultrasonic impact and static load, which produces severe plastic deformation on the surface of the material.…”

Section: Xrd and Roughness Analysismentioning

confidence: 99%

Research on surface properties of Ti-6Al-4V alloy by multi-ultrasonic rolling

Wang

Pan

Liu

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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The main purpose of this paper was to investigate the effect of the multiple ultrasonic surface rolling process (USRP) on the surface mechanical properties and wear mechanism of Ti-6Al-4V. Firstly, X-ray diffraction (XRD) microscopic analysis, work hardening and residual stress were used to measure and characterize the surface performance by USRP. The friction coefficient and wear morphology were obtained by the scanning electron microscope (SEM), three-dimension (3D) white light interferometer and energy dispersive spectrometer (EDS). The results showed that the material surface mechanical properties was effectively improved by the USRP, and the surface grains were refined to form nanoscale. It also can be found that the wear resistance of the material surface was effected by the surface mechanical properties. With the increase of processing, the main wear mechanism changed from delamination-based oxidation wear to adhesive wear with the increase of processing.

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Effect of extrusion ratios on microstructural evolution, textural evolution, and grain boundary character distributions of pure copper tubes during hydrostatic extrusion

Cited by 15 publications

References 31 publications

Mechanical properties, microstructure, and texture evolution of copper sheets subjected to differential speed rolling process

Mechanical properties, microstructure, and texture evolution of copper sheets subjected to differential speed rolling process

Effect of strains on textural evolution of hydrostatically extruded niobium tubes

Research on surface properties of Ti-6Al-4V alloy by multi-ultrasonic rolling

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