Nano-scale twinned Cu with ultrahigh strength prepared by direct current electrodeposition

Li, Sujie; Zhu, Qing–Ling; Zheng, Boda; Yuan, Jie; Wang, Xiaojing

doi:10.1016/j.msea.2019.04.107

Cited by 49 publications

(22 citation statements)

References 34 publications

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“…The combined use of cold-rolling and annealing can remarkably enhance the yield strength. After cold-rolling, a high density of dislocations and nano-twins can generate dislocations hardening and refinement hardening via twin boundaries, respectively [36]. Thus, significant high yield strength can be obtained in the AR sample.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

The Effects of Annealing at Different Temperatures on Microstructure and Mechanical Properties of Cold-Rolled Al0.3CoCrFeNi High-Entropy Alloy

Zhu

Yang

Shi

et al. 2021

Metals

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In this work, cold-rolling was utilized to induce a high density of crystal defects in Al0.3CoCrFeNi high-entropy alloys. The effects of annealing temperature on static recrystallization, precipitation behavior and mechanical properties were investigated. With increasing annealing temperature from 590 °C to 800 °C, the area fraction of recrystallized region increases from 26.9% to 93.9%. Cold-rolling deformation largely promotes the precipitation of B2 phases during annealing, and the characteristics of the precipitates are linked to recrystallization level. The coarse and equiaxed B2 phases exist in the recrystallized region and the fine and elongated B2 phases occupy the non-recrystallized region. Combined use of cold-rolling and annealing can remarkably enhance the strength and toughness. A partially recrystallized microstructure in a cold-rolled sample annealed at 700 °C exhibits a better combination of strength and toughness than a fully recrystallized microstructure in a cold-rolled sample annealed at 800 °C. Finally, related mechanisms are discussed.

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Section: Mechanical Propertiesmentioning

confidence: 99%

The Effects of Annealing at Different Temperatures on Microstructure and Mechanical Properties of Cold-Rolled Al0.3CoCrFeNi High-Entropy Alloy

Zhu

Yang

Shi

et al. 2021

Metals

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“…Twin boundaries in the Cu phase can be produced by either mechanical or annealing treatment, which are called mechanical twin and annealing twins, respectively [ 15 , 16 , 17 , 18 , 19 , 20 ]. Furthermore, many researchers reported that twin boundaries can be produced by means of the electroplating [ 9 , 12 , 21 , 22 , 23 ]. The amount and density of the twin boundaries can be manipulated by the specific additives, pulse current modes, and different types of electroplating solution [ 9 , 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

“…Like other grain boundaries, twin boundary can increase the strength of metals by retarding the motion of the dislocations driven by the external stress. For example, Li et al have compared the mechanical of the Cu films with the twin granular structure mentioned above [ 21 ]. However, many researchers also have found that the twin boundaries could be removed by imposing the external stress, which is called de-twining [ 31 , 32 , 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of De-Twinning on Tensile Strength of Nano-Twinned Cu Films

et al. 2021

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Tensile tests were carried on the electroplated Cu films with various densities of twin grain boundary. With TEM images and a selected area diffraction pattern, nano-twinned structure can be observed and defined in the electroplated Cu films. The density of the nano-twin grain structure can be manipulated with the concentration of gelatin in the Cu-sulfate electrolyte solution. We found that the strength of the Cu films is highly related to the twin-boundary density. The Cu film with a greater twin-boundary density has a larger fracture strength than the Cu film with a lesser twin-boundary density. After tensile tests, necking phenomenon (about 20 μm) occurred in the fractured Cu films. Moreover, by focused ion beam (FIB) cross-sectional analysis, the de-twinning can be observed in the region where necking begins. Thus, we believe that the de-twinning of the nano-twinned structure initiates the plastic deformation of the nano-twinned Cu films. Furthermore, with the analysis of the TEM images on the nano-twinned structure in the necking region of the fractured Cu films, the de-twinning mechanism attributes to two processes: (1) the ledge formation by the engagement of the dislocations with the twin boundaries and (2) the collapse of the ledges with the opposite twin-boundaries. In conclusion, the plastic deformation of nano-twinned Cu films is governed by the de-twinning of the nano-twinned structure. Moreover, the fracture strength of the nano-twinned Cu films is proportional to the twin-boundaries density.

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“…The composite foil (Figure b) appears to have smaller grain sizes and more nanotwins than those of pure Cu foil (Figure a). Twin boundaries can effectively block the movement of dislocation and reduce electron scattering and so can improve the mechanical and physical properties of the Cu foil. , In the process of ELD, Ni nanosheets can catalyze the redox reaction of Cu 2 + in the presence of a reducing agent to form Cu particles and deposited on NCG to form interfacial bonding . Ni has good interfacial bonding with Cu and carbon materials, and therefore, Ni is a medium to improve the interfacial properties of Cu and NCG.…”

Section: Resultsmentioning

confidence: 99%

Scalable Preparation of Ultrathin Graphene-Reinforced Copper Composite Foils with High Mechanical Properties and Excellent Heat Dissipation

Wei

Hong

et al. 2021

ACS Appl. Mater. Interfaces

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As an important basic material of electronic equipment, copper (Cu) foils should have a small thickness, good mechanical properties, and excellent thermal conductivity. However, preparing an ultrathin Cu foil with good properties remains challenging. Herein, we report an electroless deposition (ELD) strategy for the facile and scalable preparation of an ultrathin freestanding nickel-coated graphene (NCG)/Cu composite foil in a short time of 25 min. The NCG can significantly improve the mechanical and physical properties of composite foils. Experimental results reveal that the NCG/Cu composite foil manifests the best performance when the NCG concentration in an ELD bath was 30 mg/L. The composite foil evidenced a thickness of 1.1 μm, a high tensile strength of 338.7 MPa, and a high thermal conductivity of 431.2 W/mK. Compared with the pure Cu foil, both bending times and elastic modulus are increased by 298.1 and 737.3%, respectively. Remarkably, the composite foil has excellent heat dissipation performance, showing enormous potential as a heat sink material. This work proposes a new method for manufacturing the ultrathin graphene-reinforced Cu composite foil with high performance for numerous applications.

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Nano-scale twinned Cu with ultrahigh strength prepared by direct current electrodeposition

Cited by 49 publications

References 34 publications

The Effects of Annealing at Different Temperatures on Microstructure and Mechanical Properties of Cold-Rolled Al0.3CoCrFeNi High-Entropy Alloy

The Effects of Annealing at Different Temperatures on Microstructure and Mechanical Properties of Cold-Rolled Al0.3CoCrFeNi High-Entropy Alloy

Effect of De-Twinning on Tensile Strength of Nano-Twinned Cu Films

Scalable Preparation of Ultrathin Graphene-Reinforced Copper Composite Foils with High Mechanical Properties and Excellent Heat Dissipation

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