Preparation and properties of enhanced bulk nanoporous coppers

Yang, Qing; Han, Bo; Wang, Jia; Mao, Ruifeng

doi:10.1016/j.matlet.2012.01.027

Cited by 34 publications

(15 citation statements)

References 14 publications

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“…It has been reported that applying an electric current pulse during the solidification processing, which refines the grain size . Electropulsing treatment (EPT) was also used during annealing of cold‐worked copper to obtain fine recrystallization grains and to retard the formation of annealing twins . Gromov et al studied the structure, phase composition, and dislocation substructure of steel subjected to EPE and found the fatigue durability increases within short‐time treatment.…”

Section: Introductionmentioning

confidence: 99%

Retracted: Effect of High‐Energy Electropulsing on the Phase Transition and Mechanical Properties of Two‐Phase Titanium Alloy Strips

Tse

Tang

et al. 2014

Adv Eng Mater

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The effect of high-energy electropulsing treatment (EPT) on the phase transition and mechanical properties of the two-phase Ti-6Al-4V alloy strips (in the solid solution state) was studied with the help of uniaxial tensile machine, X-ray diffraction, optical stereo-microscope, scanning electron microscope, and electrical resistance meters. Results show that the ductility of the titanium alloy strips under EPT could be enhanced remarkably at most by 225% while keeping the tensile strength nearly unchanged. EPT facilitates b-Ti phase precipitation noticeably with increasing percentage of the b phase and the average size of the b phase. In addition, precipitated b phase gathers coarsening, forms into continuous strips and migrates from the interior grains to the inter-granular regions transforming the wormlike microstructure into the equiaxed microstructure. The mechanism for rapid phase change during EPT is put forward with increasing the nucleation rate of the a ! b phase transformation and accelerating the diffusion flux of vanadium atoms under the coupling of the thermal and athermal effects. Therefore, a highly efficient aging treatment method for titanium alloys is provided to prepare advanced engineering materials with outstanding mechanical properties, which can be widely applied in the aerospace and biomedical fields.

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Section: Introductionmentioning

confidence: 99%

Retracted: Effect of High‐Energy Electropulsing on the Phase Transition and Mechanical Properties of Two‐Phase Titanium Alloy Strips

Tse

Tang

et al. 2014

Adv Eng Mater

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“…As shown in Table II Figure 4 shows the mechanical property histogram of NP-Cu and NP-Cu/Ni. The elastic modulus and hardness of the nanoporous structures were improved by electroless plating, which may due to the increase of ligament width and enhancement of connection between ligaments [9]. As shown in Fig.…”

Section: Resultsmentioning

confidence: 89%

“…Cu 30 Zn 70 alloy was prepared by melting Cu powders and bulk Zn with atomic ratio of 3 : 7 in a nitrogen atmosphere, the detailed procedure was reported in Ref. [9]. NP-Cu was prepared by dealloying of Cu 30 Zn 70 precursor at 70 • C in corrosion solution consisting of 1 mol/L HCl + 4 mol/L NH 4 Cl.…”

Section: Methodsmentioning

confidence: 99%

“…As a sustainable non-noble nanoporous metal, nanoporous copper (NP-Cu) which can be prepared at low cost has attracted much attention due to the high electrical and thermal conductivity of copper [7,8]. Furthermore, the mechanical, corrosion resistance and catalytic properties can be improved by surface modification [9][10][11]. Electroless plating is a universal coating technique to improve the corrosion or wear resistance of various metals [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…Nanoporous metals can be employed as electroless plating substrates due to their high surface activity. The catalytic properties, corrosion resistance, mechanical properties, and electrical and thermal conductivities of NP-Cu were improved by electroless plating of Pt, Ni, and Cu [9,10,15]. In addition, the appropriate use of complexing agents can not only improve the stability of plating solution, but also effectively regulate the coating deposition process and its performance [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Complexing Agents on Morphologies and Mechanical Properties of Nanoporous Copper/Nickel

Yang

2018

e-J. Surf. Sci. Nanotech.

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Nanoporous copper/nickel (NP-Cu/Ni) were prepared by electroless plating of NiP on nanoporous copper (NP-Cu). The influence of concentration ratio of lactic acid to citric acid on the morphologies and mechanical properties of NP-Cu/Ni was investigated. The results showed that the ligament width increased after electroless plating and the three-dimensional bicontinuous ligament-channel structure was retained. The mechanical properties were improved. NP-Cu/Ni prepared using concentration ratio of 30 g/L : 20 g/L demonstrated the best comprehensive performance.

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Engineering a Hierarchy of Disorder: A New Route to Synthesize High‐Performance 3D Nanoporous All‐Carbon Materials**

Lee,

Loh,

Yeo

et al. 2024

Advanced Materials

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We report a new nanoporous amorphous carbon (NAC) structure that achieves both ultrahigh strength and high electrical conductivity, which are usually incompatible in porous materials. By using modified spark plasma sintering, we create three amorphous carbon phases with different atomic bonding configurations. The composite consists of an amorphous sp2‐carbon matrix mixed with amorphous sp3‐carbon and amorphous graphitic motif. NAC structure has isotropic electrical conductivity of up to 12,000 S/m, a Young's modulus of up to ∼5 GPa, and Vickers hardness of over 900 MPa. These properties are superior to those of existing conductive nanoporous materials. Direct investigation of the multiscale structure of this material through transmission electron microscopy (TEM), electron energy loss spectroscopy (EELS), and machine learning‐based electron tomography revealed that the origin of the remarkable material properties is the well‐organized sp2/sp3 amorphous carbon phases with a core‐shell‐like architecture, where the sp3‐rich carbon forms a resilient core surrounded by a conductive sp2‐rich layer. Our research not only introduces novel material with exceptional properties, but also opens new opportunities for exploring amorphous structures and designing high‐performance materials.This article is protected by copyright. All rights reserved

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Preparation and properties of enhanced bulk nanoporous coppers

Cited by 34 publications

References 14 publications

Retracted: Effect of High‐Energy Electropulsing on the Phase Transition and Mechanical Properties of Two‐Phase Titanium Alloy Strips

Retracted: Effect of High‐Energy Electropulsing on the Phase Transition and Mechanical Properties of Two‐Phase Titanium Alloy Strips

Influence of Complexing Agents on Morphologies and Mechanical Properties of Nanoporous Copper/Nickel

Engineering a Hierarchy of Disorder: A New Route to Synthesize High‐Performance 3D Nanoporous All‐Carbon Materials**

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