Enhancing tensile strength of Cu by introducing gradient microstructures via a simple torsion deformation

Guo, Ning; Song, Bo; Yu, Hongbing; Xin, Renlong; Wang, Bingshu; Liu, Tingting

doi:10.1016/j.matdes.2015.10.157

Cited by 52 publications

(23 citation statements)

References 27 publications

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“…Recently, it has been found that torsion deformation is somewhat superior for improving the mechanical properties of rod-shaped materials [22,23,24,25,26,27,28]. Specifically, torsion deformation can introduce a gradient distribution of deformed microstructure compared with other deformation types.…”

Section: Introductionmentioning

confidence: 99%

Improving Tensile and Compressive Properties of an Extruded AZ91 Rod by the Combined Use of Torsion Deformation and Aging Treatment

et al. 2017

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In this study, AZ91 magnesium alloy rods were used to investigate the effects of torsion deformation on microstructure and subsequent aging behavior. Extruded AZ91 rod has a uniform microstructure and typical fiber texture. Torsion deformation can generate a gradient microstructure on the cross-section of the rod. After torsion, from the center to the edge in the cross-section of the rod, both stored dislocations and area fraction of {10-12} twins gradually increase, and the basal pole of the texture tends to rotate in the ED direction. Direct aging usually generates coarse discontinuous precipitates and fine continuous precipitates simultaneously. Both twin structures and dislocations via torsion deformation can be effective microstructures for the nucleation of continuous precipitates during subsequent aging. Thus, aging after torsion can promote continuous precipitation and generate gradient precipitation characteristics. Both aging treatment and torsion deformation can reduce yield asymmetry, and torsion deformation enhances the aging hardening effect by promoting continuous precipitation. Therefore, combined use of torsion deformation and aging treatment can effectively enhance the yield strength and almost eliminate the yield asymmetry of the present extruded AZ91 rod. Finally, the relevant mechanisms are discussed.

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Section: Introductionmentioning

confidence: 99%

Improving Tensile and Compressive Properties of an Extruded AZ91 Rod by the Combined Use of Torsion Deformation and Aging Treatment

et al. 2017

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“…Theoretically, the materials deform elastically rather than plastically in the core region during the torsion. We have reported that after the pre‐torsion deformation, the grains almost maintain their original equiaxed shape in the near‐core region, and the microstructural change mainly occurs in the surface layer due to the strain gradient of torsion . Thus, microstructural characterizations were mainly concentrated on the near‐surface layer (about 1.9 mm from the rod axis) along the longitudinal sections of the torsion deformed samples in this study (see Figure S2 in Supplementary Information).…”

Section: Materials and Experimental Sectionmentioning

confidence: 63%

“…Thus, microstructural characterizations were mainly concentrated on the near‐surface layer (about 1.9 mm from the rod axis) along the longitudinal sections of the torsion deformed samples in this study (see Figure S2 in Supplementary Information). Such characterization method can reflect the shear direction (SD) of torsion and the microstructural feature of the torsional samples in the RA–SD plane …”

Section: Materials and Experimental Sectionmentioning

confidence: 99%

“…Based on recent advances in our understanding of the effect of conventional torsion on the microstructures and mechanical properties of engineering materials, such as cold drawn pearlitic steel wire and magnesium alloy, we propose a novel approach to optimize the strength and ductility of copper by means of torsion deformation. It has been found that torsion deformation can significantly enhance the tensile yield strength of the commercial as‐extruded copper rods without changing their shape and size . The purpose of this study is to study the influence of torsion deformation on microstructures and properties of commercial hot‐extruded Cu rods by twisting the rods to different number of revolutions.…”

Section: Introductionmentioning

confidence: 99%

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Microstructures and Mechanical Properties of Commercial Hot‐Extruded Copper Processed by Torsion Deformation

Guo

Xiao

et al. 2016

Adv Eng Mater

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Free-end torsion deformation is used for processing copper rod in this work. Both microstructures and mechanical properties of the torsional rods are quantitatively analyzed. The results show that gradient lamellar dislocation substructures (LDS) along the radial direction as the main defects are formed after torsion. The increment of the LDS density, the shrinking of spacing size, and the change of length/ spacing (L/S) ratio of the LDS are all non-monotonic function of torsion revolution. High-density LDS with fine spacing can retain strain hardening capability, which results in good combination of high tensile strength and good ductility in the torsional deformed sample with large number of revolutions. The influence of torsion strain on primary twin boundaries (TBs) in the hot-extruded rod is also discussed. Fig. 4. Statistical measurements of the LDS size and morphology evolutions with increasing torsion strain: (a) distribution of LDS spacing; (b) distribution of length/spacing (L/S) aspect ratios of LDS in the torsional samples with different strains. The results were determined by using of at least five ECCI images for each sample.

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“…However, the limited depth of the gradient structure (about a few hundred microns) formed by the general processing ways hinders the applicability to large-scale components. Recently, pre-torsion deformation, which can introduce gradient microstructures at larger scales, has been used to obtain good mechanical properties of Cu [13], Mg [14], and steels [15]. Using the same method, Wei et al [16] found that a synergy of strength and ductility can be achieved through gradient nanotwins in a dumbbell-shaped TWIP steel specimen.…”

Section: Introductionmentioning

confidence: 99%

Outstanding Tensile Properties and Their Origins in Twinning-Induced Plasticity (TWIP) Steels with Gradient Substructures

et al. 2020

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The low yield strength (~300 MPa) of twinning-induced plasticity (TWIP) steels greatly limits their structural applications in the industrial field. Conventional strengthening mechanisms usually cause an enhancement of yield strength but also a severe loss of ductility. In this research, gradient substructures were introduced in the Fe-22Mn-0.6C TWIP steels by different pre-torsional deformation in order to overcome the above limitations. The substructure evolution, mechanical properties, and their origins in gradient-substructured (GS) TWIP steels were measured and compared by electron backscattered diffraction (EBSD), monotonous and loading-unloading-reloading (LUR) tensile tests. It was found that a simple torsional treatment could prepare gradient twins and dislocations in coarse-grained TWIP steel samples depending on torsional strain. The uniaxial tensile tests indicated that a superior combination of high yield strength, high ultimate strength, and considerable ductility was simultaneously obtained in the GS samples. The high yield strength and high ultimate tensile strength were attributed to synergetic strengthening mechanisms, viz., dislocation strengthening, due to the accumulation of high density of dislocations, and very high back stress strengthening due to gradient substructure distribution, which was accommodated through pile-ups of extra geometrically necessary dislocations (GNDs) across the sample-scale. Additionally, high ductility originated from gradient substructure-induced back stress hardening. The present study is also beneficial to the design efforts of high strength and high ductility of other heterogeneous-structured TWIP alloy systems.

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Enhancing tensile strength of Cu by introducing gradient microstructures via a simple torsion deformation

Cited by 52 publications

References 27 publications

Improving Tensile and Compressive Properties of an Extruded AZ91 Rod by the Combined Use of Torsion Deformation and Aging Treatment

Improving Tensile and Compressive Properties of an Extruded AZ91 Rod by the Combined Use of Torsion Deformation and Aging Treatment

Microstructures and Mechanical Properties of Commercial Hot‐Extruded Copper Processed by Torsion Deformation

Outstanding Tensile Properties and Their Origins in Twinning-Induced Plasticity (TWIP) Steels with Gradient Substructures

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