Cu-10 Wt Research Articles

Development and mechanical properties investigation of Cu-MWCNT-graphite nanoplatelets hybrid nanocomposites

In this work, Cu-based MWCNT-xGnP hybrid reinforced nanocomposites were fabricated by spark plasma sintering (SPS) and conventional sintering, and their microstructure and mechanical properties were analyzed using several techniques. As compared to sintered pure Cu samples, a remarkable enhancement in physical and mechanical properties is observed in the developed Cu-based hybrid nanocomposites. Hybrids of multiwalled carbon nanotubes and graphite nanoplatelets (MWCNT-xGnP) containing different ratios of MWCNT and xGnP were used as co-reinforcements to strengthen the Cu matrix. The influence of various MWCNT-xGnP hybrid nanofillers having different weight ratios of MWCNT and xGnP on the microstructure, mechanical properties, and wear behavior of Cu-MWCNT-xGnP nanocomposites have been investigated. The highest relative density, better wear behaviour, and hardness were observed in the case of Cu-2 wt% MWCNT50xGnP50 nanocomposite for both conventionally sintered and SPSed nanocomposites.

Rapid Nb3Sn film growth by sputtering Nb on hot bronze

Nb deposited by magnetron sputtering onto hot Cu-15 wt.%Sn bronze substrates at temperatures above 700 °C achieved Nb3Sn film growth at a rate of 33 nm min−1, which was an order of magnitude faster than that achieved for deposition of Nb on bronze at low temperature followed by in situ post reaction at the same high temperatures. Tin content in the Nb3Sn films made on hot bronze was ∼26.3%, which is significantly higher than ∼24.5% obtained by post-reaction as well as for typical bulk reactions between Nb and α-bronze. The Nb3Sn lattice parameter was consistent with measured tin content and predicted elastic strain for both routes. Critical temperatures of 14 K–16 K, instead of 18 K, were consistent with elastic strain due to coefficient of thermal expansion mismatch between the Nb3Sn and bronze substrate and, for the hot-bronze samples, stress related to the growth mechanism. Films were fully coalesced and had surface roughness values <20 nm over a 100 μm2 scan. Grain structure of the Nb3Sn films produced by Nb sputtering on hot bronze resembles zone 2 in the Thornton structure-zone diagram, in contrast to the equiaxed grain structure reminiscent of microstructure observed in reacted Nb3Sn wires exhibited by the post-reaction route.

Microstructural evolution in Cu–Nb processed via friction consolidation

Immiscible alloys, whether in well-mixed or layered forms, are of increasing interest based on their novel structural and functional properties, such as enhanced thermal stability against grain growth or radiation-induced defect trapping at the interfaces. To address the need for new approaches to tailor microstructures, the microstructural development of an immiscible Cu-4 wt.% Nb alloy processed via friction consolidation of elemental powders is investigated. Friction consolidation is a solid phase processing technique that imparts severe plastic strain into a deforming volume resulting in elevated temperatures below the melting temperature of the alloy. Two distinct processing pathways were chosen to understand the effect of thermomechanical conditions on the final microstructure. The microstructure was characterized using scanning electron microscopy, scanning transmission electron microscopy, and X-ray diffraction techniques. Path 1 exhibited larger strain, strain rate, and temperature as compared with path 2. In path 1, agglomerated Nb particles were present in the recrystallized ultrafine-grained Cu matrix, while in path 2 extremely fine and dispersed Nb particles were present in a highly deformed Cu matrix. In both pathways, supersaturation of Cu in Nb lattices was noted, but not vice versa. The asymmetry in mixing is explained based on deformation-based, thermodynamic and kinetic factors. These findings provide a pathway for creation of novel tailored microstructures and improved properties in any number of binary immiscible alloy systems.

Comparative study on carbon nanotube and graphene reinforced Cu matrix nanocomposites for thermal management applications

Cu-1 wt% carbon nanotube (CNT) and Cu-1 wt% multilayer graphene (Gr) nanocomposites were produced by 5 h mechanical milling. Then consolidations through three different techniques of cold press, hot press and spark plasma sintering (SPS) were done. Structure, microstructure, relative density, mechanical properties, electrical and thermal conductivity, thermal stability and coefficient of thermal expansion (CTE) were evaluated. Relatively good dispersion of CNTs and Gr in the Cu matrix were obtained. A decrease in particle size was much more notable in CuGr powder. The crystallite size decreases to 36 and 20 nm with the addition of both CNT and Gr, respectively. A comparison of the consolidation technique of SPS with others showed the maximum relative density, hardness and yield strength obtained by the SPS method. The relative density of CuGr and CuCNT nanocomposites consolidated by SPS was found to be 95–97%. The hardness of CuGr nanocomposite was 76 BHN, which was approximately 81 and 9% higher than of the Cu sample and CuCNT nanocomposite, respectively. The higher yield strength of 210 MPA was obtained for CuGr nanocomposite consolidated by SPS. CNTs and Gr are thoroughly embedded in the matrix and bonded tightly. The High electrical conductivity of 78%IACS, the thermal conductivity of 351 W/mK were achieved in the CuGr nanocomposite in combination with a CTE of 12.8 ppm/K. Both thermal distortion parameter (TDP) and softening percent of the nanocomposites were decreased by the addition of Gr and CNT. The present work implies that CuGr nanocomposite may be a good candidate for thermal management applications.

Effect of nanostructured Cu on microstructure, microhardness and wear behavior of Cu-xGnP composites developed using mechanical alloying

In the present study, Cu-1, 2 and 3 wt.% xGnP composites have been developed by powder metallurgy (PM) route using nanostructured Cu powder and their effect on microstructure, microhardness, sliding wear behaviour has been examined. The crystallite size and lattice strain of Cu after 25 h of mechanical milling have been found to be 16 nm and 0.576%, respectively. Major challenges associated with the development of Cu-xGnP composites is the uniform dispersion of the nanoplatelets in the Cu matrix, which have been dealt out by incorporating the nanostructured Cu- xGnP composites after mechanical alloying leading to the homogenous distribution of nanoplatelets in the Cu-matrix. A significant enhancement in relative density, microhardness and wear resistance of the Cu-3 wt. % xGnP nanofiller composite in particular has been observed due to the uniform distribution of the nanofillers. In Cu-3 wt. % xGnP composite developed using as-milled nanostructured Cu, a microhardness of ∼ 1.1 GPa could be achieved which is about ∼3 times higher than that of the pure sintered Cu sample (∼359 MPa). Nanostructured Cu also leads to enhancement of the hardness and wear property as compared to the as-received Cu. The wear mechanism in the various nanostructured Cu-xGnP composites has been studied in details.

Effect of Macroalloying Element Addition of Aluminum on Pure Copper

The influence of aluminum on copper (aluminum bronze) produced by die-casting process is reported in this work. Pure copper and aluminum bronze for 5 and 10 wt.% Al are produced by die casting process. Optical micrographs of pure copper, aluminum bronze with 5 and 10 wt.% Al revealed equiaxed grains, dendritic structure and martensite structure, respectively. The density of the copper, 5 and 10 wt.% aluminum bronze are reported as 8484 ± 84, 7991 ± 94 and 7518 ± 40 kg/m3, respectively. The Micro Vickers hardness of the copper, Cu-5 wt.% Al and Cu-10 wt.% Al, respectively, found to be observed as 96.833 ± 4.88, 139.01 ± 4.96 and 257.22 ± 5.85 HV1. The compression strength, wear behavior of pure copper, aluminum bronze of 5 and 10 wt.% Al were investigated by conducting the compression test and wear behavior using pin-on-disk wear test for different speeds and different loads.

Effect of the Small Punch Test sample geometry on the Liquid Metal Embrittlement of Cu-30 wt% Zn by the eGaIn

Liquid metal embrittlement (LME) is the embrittlement or the modification of the fracture behaviour of a metal or alloy when it undergoes plastic deformation while in contact with a liquid metal or liquid alloy. LME occurrence depends strongly on the properties of the metals involved and on the conditions of the mechanical stresses applied to the solid. The Small Punch Test (SPT) on flat specimens is very sensitive to identify the conditions of LME occurrence. Moreover, there are alternative SPT notched specimen geometries that have the potential to screen solid/liquid couples for sensibility to LME in different conditions. To study the apparition of the LME on an alpha brass with 30 wt% Zn in contact with the eGaIn (Ga-In eutectic), SPT at room temperature were carried out at different displacement rates and using three specimen types: the standard flat geometry and two notched geometries. While the flat specimens did not present LME, the presence of a notch and a high strain rate induced LME on the other specimen geometries. For these last specimens, the eGaIn modifies the SPT load-displacement curves at the crack propagation stage and changes the fracture to a partially ductile fracture followed by a brittle fracture.

Experimental study of the influence of operational and geometric variables on the powders produced by close-coupled gas atomisation

The effect of several operational and geometric variables on the particle size distribution of powders produced by close-coupled gas atomisation is analysed from a total of 66 experiments. Powders of three pure metals (copper, tin and iron) and two alloys (bronze Cu-15 wt% Sn and stainless steel SS 316 L) have been produced. Nitrogen, argon and helium were used as atomising gases. It is shown that the gas-to-metal ratio of volume flow rates (GMRV) is more relevant than the ratio of mass flow rates (GMR) in order to analyse the effect of atomisation variables on the particle size. Kishidaka's equation, originally proposed for water atomisation, is modified to predict the median particle size in gas atomisation. The accuracy of the new equation is compared with that of Lubanska, and Rao and Mehrotra. Kishidaka's modified empirical correlation is the most accurate in predicting the median particle size of the powders produced in this work. The morphology of the produced powders is studied by scanning electron microscopy (SEM) and it is observed that the melt superheat can play an important role in the aggregation of fine particles (< 10 μm), which increases the fraction of large particles (> 100 μm).

Extension of Solid Solubility and Structural Evolution in Nano-Structured Cu-Cr Solid Solution Induced by High-Energy Milling

In Cu-Cr alloys, the strengthening effects of Cr are severely limited due to the relatively low Cr solid solubility in Cu matrix. In addition, apart from the dissolved Cr, it should be noted that high proportion of Cr in Cu matrix work as the second phase dispersion strengthening. Therefore, it is of great significance to extend the Cr solid solubility and decrease the size of the undissolved Cr phase to nano-structure. In this work, the nano-sized Cu-5 wt.% Cr solid solution was achieved through high energy ball milling (HEBM) only for 12 h. The Cr solubility of ~1.15 at.% was quantitatively calculated based on XRD patterns, which means supersaturated solid solution was realized. Except for the dissolved Cr, the undissolved Cr phase was with nano-sized work as the second phase. Upon milling of the Cu-Cr powders with coarse grains, the crystallite sizes and grain sizes are found to decrease with the milling time, and remain almost unchanged at a steady-state with continued milling. In addition, it was found that the stored energy induced by dislocation density increment and grain size refinement would be high enough to overcome the thermodynamic barrier for the formation of solid solution.

Effect of titanium diboride ceramic particles on mechanical and wear behaviour of Cu-10 wt% W alloy composites processed by P/M route

Hypothesis of this research focuses on evaluating mechanical properties and thereby determine optimized conditions for lessened wear rate of powder metallurgy processed Titanium diboride (TiB2) reinforced Cu–W alloy matrix composites. Tungsten and Titanium diboride powders were mixed with copper powder to the state of homogeneity by mechanical alloying method, compacted in a computerized hydraulic press and further sintered at 900 °C for 2 h under argon environment. SEM studies revealed that TiB2 particles were disseminated evenly in Cu–W alloy. The fabricated composites were subjected to EDS and XRD studies to confirm the presence of required elements and the occurrence of oxides formed while sintering. The impact of wear test input parameters on the wear rate was identified and the optimized parameter to attain low wear rate was determined through Taguchi and ANOVA analysis by using L16 orthogonal array. The hardness, impact strength, compressive strength, and wear resistance of the composites experience considerable enhancement, with the inclusion of TiB2 particles. The optimized parameters to achieve less wear rate was arrived as A4B1C1D1 and the composite with 12 wt% TiB2 content subjected to 10 N load with 1 m/s velocity and 300 m sliding distance attained minimum wear rate.

Effect of xGnP/MWCNT reinforcement on mechanical, wear behavior and crystallographic texture of copper-based metal matrix composite

In the present investigation, Cu-based MMCs have been developed by PM route using exfoliated graphite nanoplatelets (xGnP) and MWCNTs as nanofillers and their influence on mechanical properties as well as crystallographic texture have been studied. xGnP possesses fine particle size as well as less disorder as compared to MWCNTs. Relative density, hardness and wear resistance found to be increased with the addition of nanofillers upto 2 wt% xGnP/MWCNTs, whereas porosity found to decrease with the addition of nanofillers upto 2 wt%. The hardness of Cu-2 wt% xGnP composite was found to be 560 MPa, which is about 1.6 times higher than that of the pure Cu sample (350 MPa) and 1.2 times greater than Cu-2 wt% MWCNTs composite (475 MPa). The wear mechanism was found to involve a combination of abrasion, ploughing, delamination, microcracks, deep grooves and pullout of nanofillers in all the composites. The tensile strength of the various Cu-xGnP composites shows an improvement upto the addition of 2 wt% xGnP. The maximum tensile strength of 130 MPa was achieved in the case of Cu-2 wt% xGnP composite, which is about 1.7 times higher than that of the pure sintered Cu sample (76 MPa). However, the tensile strength of the various Cu-MWCNT composites continuously decreases with the addition of MWCNTs. The homogenous distribution of xGnP, as well as good bonding of xGnP with Cu matrix, has been observed in SEM and TEM images of composites, which is found to be more dominant as compared to MWCNTs distribution in Cu-matrix. The residual stress in the various composites was found to be compressive in nature, and it shows a similar trend as that of the other properties like hardness and wear behaviour of the composites. The addition of nanofillers also altered the crystallographic texture of the composites. xGnP leads to weaker texture as well as decrees in the volume fraction of 〈011〉 fiber as compared to MWCNTs in Cu-based MMCs, which leads to having superior mechanical properties as compared to MWCNTs composites.

Microstructure evolution and deformation behaviour of Cu-10 wt%Fe alloy during cold rolling

In order to shorten the production process of Cu-Fe alloy and improve the microstructure homogeneity and properties and properties, Cu-10 wt%Fe alloy billet was prepared by double-melt mixed casting process and then cold rolled. Microstructure and mechanical property evolutions of the alloy and its deformation behaviours were investigated. The results showed that the alloy billet had dispersed spherical Fe phase particles and dendritic Fe phases. The alloy billet had excellent plasticity, and the cumulative cold rolling reduction without intermediate annealing reached 98%. When the reduction was 30%, numerous dislocations produced in the Cu matrix and the Cu matrix near the Fe phase underwent local crystal rotation, and the Fe phase particles deformed slightly. When the reduction exceeded 90%, dynamical recrystallization of the Cu matrix happened, fine grains with average diameter of ~300 nm formed, and the dendritic Fe phases were evenly distributed along the rolling direction, which mainly contributed to achieve large-reduction of cold rolling. When the reduction was 98%, the tensile strength and hardness increased from 340 MPa and 87 HV of the as-cast alloy to 543 MPa and 164 HV, respectively, and the elongation and electrical conductivity was reduced to 3.0% and 13.5%IACS. A process of double-melt mixed casting → cold rolling can work as a novel high-efficiency and compact method to produce Cu-Fe alloy sheet.

Influence of strain rate and Sn in solid solution on the grain refinement and crystalline defect density in severely deformed Cu

A commercially pure Cu and a Cu-8 wt.%Sn alloy were subjected to high pressure torsion (HPT) to study the effect of Sn as solute element and deformation rate on the grain refinement mechanism and the defect accumulation in Cu. The microstructure and hardness of produced ultrafine grained (UFG) states of both materials were carefully characterized. We show that addition of Sn in Cu leads to significant decrease in grain size, accumulation of higher stored energy and increase in hardness accompanied with the delay of hardness saturation with shear strain. Increasing HPT deformation rate induces significant heat dissipation in the processed materials markedly pronounced in CuSn8 as compared to Cu. Surprisingly, deformation rate has the opposite effect on the microhardness of UFG Cu and CuSn8, which decreases with the deformation rate for the case of Cu, while exhibits faster saturation to higher values for CuSn8. We also show that despite higher self-heating at higher deformation rates, higher HPT rotation speed provides reduction in grain size and increase in the defect density for CuSn8 alloy. This effect is assumed to be related to strong interactions between Sn solute atoms and strain-induced defects so that mechanically driven effects prevail over dynamic annihilation of dislocations. Finally, we present a qualitative model based on the phenomena of production and annihilation of dislocations. This model was able to reproduce the evolution of grain size, concentrations defects and hardness with different deformation parameters and after the addition of solute element in material.

Copper promoted Co/MgO: A stable and efficient catalyst for glycerol steam reforming

Different types of cobalt-based mixed oxide catalysts (20 wt%Co/MgO, 5 wt%Cu-20 wt% Co/MgO, 20 wt%Co/50%MgO–50%Al2O3) were synthesized by the co-precipitation method and applied for hydrogen production from glycerol steam reforming. The catalysts were characterized using X-ray diffraction (XRD), H2-Temperature-programmed reduction (H2-TPR), CO2-Temperature Programmed desorption, CO-Chemisorption, and CHN techniques. The H2-TPR analysis showed the reducibility of cobalt-oxide (5Cu20CM; 5 wt%Cu-20 wt% Co/MgO) was enhanced by the copper, and reduction profiles of cobalt oxide shifted to a lower temperature (<450 °C). Among the catalysts, 5Cu20CM showed a maximum yield of hydrogen (74.6%) with 100% conversion of glycerol to the gaseous phase. The superior catalytic performance of 5Cu20CM for glycerol conversion was attributed to the smaller particle size (7 nm), higher dispersion of cobalt (35.0%), and the higher surface area (56 m2/g) of cobalt metal. Furthermore, Raman spectroscopy of the spent catalysts confirmed that the copper promoted cobalt-magnesium catalyst suppressed the carbon formation, consequently, 5Cu20CM catalyst showed a stable performance up to 30 h.

Friction and wear of Cu-15 wt%Ni-8 wt%Sn bronze lubricated by grease at room and elevated temperature

Cu-15 wt%Ni-8 wt%Sn (CuNiSn) bronze alloy shows promising bearing performance when used in tribological applications and has attracted increasing research interest. In this work, the tribological performance of CuNiSn in terms of friction and wear were investigated in a ball-on-disc contact configuration, sliding against a Al2O3 ball under varying normal loads (1 and 4 N) and environmental temperatures (room temperature (~18 °C) and 110 °C). Post-test characterization techniques, including optical profilometry, scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and transmission electron microscopy (TEM) were adopted to characterize the wear track on the CuNiSn surface after 13,500 cycles of reciprocating sliding. Both friction and wear behaviour was found to depend on the load and temperature whilst wear resistance reduced with increased temperature. A mechanically mixed layer (MML) and plastic deformation layer (PDL) were characterized by TEM micrographs of the cross-section from the wear track. Under 4 N load, a 1–1.5 μm thick tribolayer was developed during sliding at room temperature compared with a 200–300 nm tribolayer at 110 °C. The friction and wear mechanisms were largely dominated by properties of the tribolayers which were initially associated with and affected by load and temperature.

Hot Pressing of Al-10 wt% Cu-10 wt% Ni/x (Al2O3–Ag) Nanocomposites at Different Heating Temperatures

For achieving good adhesion, full densification, and consequently, improving weakness in mechanical properties of aluminum matrix, the electroless coating, and cold–hot pressing have applied. Five Al-10 wt% Cu-10 wt% Ni/x (Al2O3–Ag) nanocomposites prepared by mixing for 6 h then fabricated by the cold pressing followed by hot pressing at different heating temperatures. Some properties of the fabricated samples include density, chemical composition, microstructure, hardness, toughness, wear rate, and wear behavior have characterized. No effect of alumina reinforcement on the densification has observed. New intermetallic such as Al3Ni2, Al3Ni, CuAl2, and Al3.892 Cu6.1 have formed at 630 °C. No cracks have propagated as a result of penetrating the indenter during hardness tests that means good toughness for all nanocomposites. The wear rate has decreased by increasing Al2O3 content. It has observed that plastic deformation dissipated by increasing the Al2O3 addition. The coefficient of thermal expansion gets enhanced by increasing the Al2O3 range.

Effect of Pre-Aging Treatment on the Mechanical Properties of Cold Rolled Cu-6 wt% Ni-1.4 wt% Si Alloy

Cu-Ni-Si alloys were strengthened by Ni2Si intermetallic compound precipitation in a Cu matrix during aging. The Cu-6 wt% Ni-1.4wt%Si alloy was prepared by water quenching (solution treatment) or air cooling (homogenization treatment) after heating 980 &lt;sup&gt;o&lt;/sup&gt;C for 2 hours and aging at 500 &lt;sup&gt;o&lt;/sup&gt;C for 6 hours. After maintaining a high temperature single phase region, the structure of the precipitate in the matrix was changed significantly by varying the cooling rate. The solution treated aged alloy had discontinuous precipitation with fiber shaped precipitates throughout the specimen, however, the alloy with homogenization had normal spherical shaped particles. The aged alloy after homogenization treatment had higher strength, ductility and electrical conductivity, of 628 MPa, 18%, 48% IACS, respectively, than aged alloy after solution treatment, which had 582 MPa, 15.5% and 50 % IACS, respectively. In contrast to the tendency of values after aging, after rolling and a 75% area reduction at room temperature after homogenization treatment the alloy had lower strength, ductility and electrical conductivity, of 774 MPa, 10.5%, 48% IACS, than the alloy after solution treatment, with 885 MPa, 6.5%, and 48% IACS, respectively. The Cu-6 wt% Ni-1.4wt%Si alloy with fully discontinuous precipitation had lower strength and higher electrical conductivity than the counterpart alloy with normal precipitation. However, inversely, the strength increased compared to the alloy with normal precipitation after rolling with 75% area reduction, without sacrificing electrical conductivity.

Influence of nanostructured Cu on the mechanical properties of Cu–MWCNTs composites

Abstract In the present investigation, Cu-multiwalled carbon nanotubes (MWCNTs) nanocomposites were developed through mechanical milling using nanostructured Cu as a matrix and MWCNTs as nanofillers. The influence of nanostructured Cu on the microstructure, microhardness, and wear behavior of Cu-MWCNTs nanocomposites was also studied. The crystallite size of nanostructured Cu powder via mechanical milling for 25 h was found to be 16 nm. The major challenge associated with the development of Cu-MWCNTs nanocomposites is the uniform dispersion of the CNTs in the Cu matrix, which was addressed by incorporating nanostructured Cu, leading to the homogeneous distribution of CNTs and good bonding between the CNTs and the Cu matrix. A significant improvement in relative density and microhardness with &lt;3 wt.% MWCNTs was observed compared to pure asreceived Cu and its composites. The hardness of Cu-3 wt.% MWCNTs nanocomposite developed using nanostructured Cu were achieved at &lt;800 MPa, which is about 2.3 times higher than that of the as-received Cu sample (~ 359 MPa). The significant increment in mechanical and wear properties mainly originates from fine-grain strengthening effects and solid solution strengthening. The wear mechanisms in the various nanostructured Cu-MWCNTs composites were studied in detail and oxidation wear was identified as one of the main wear mechanisms.

Microstructure and mechanical properties of a Cu-Fe-Nb alloy with a high product of the strength times the elongation

The tradeoff between the strength and fracture elongation in the high strength Cu-Fe alloys has been a research focus recently. A Cu-10 wt.%Fe-0.5 wt.% Nb alloy was designed and fabricated by casting and thermomechanical treatment to high strength and elongation. Microstructure evolutions and properties variations of the studied alloy during cold-drawing and cold rolling were investigated. After annealed at 400 ℃ for 1 h and further aged at 450 ℃ for 8 h, the ultimate tensile strength, elongation, product of the strength times the elongation (PSE), and electrical conductivity of the cold-drawn studied alloy were 736 MPa, 36 %, 22.82 GPa%, and 48.74 %IACS, respectively. Nanocrystals, Nb precipitates, and Fe fibers were detected in the studied alloy, which contributed to the high strength and the high fracture elongation. These findings provide essential understandings of the effects of the niobium on Cu-Fe system alloys, and the designed Cu-Fe-Nb alloy with high strength and fracture elongation could fulfill some requirements of the electronic and electrical industry.

Influence of nanostructured Cu on the mechanical properties of Cu–MWCNTs composites

Abstract In the present investigation, Cu-multiwalled carbon nanotubes (MWCNTs) nanocomposites were developed through mechanical milling using nanostructured Cu as a matrix and MWCNTs as nanofillers. The influence of nanostructured Cu on the microstructure, microhardness, and wear behavior of Cu-MWCNTs nanocomposites was also studied. The crystallite size of nanostructured Cu powder via mechanical milling for 25 h was found to be 16 nm. The major challenge associated with the development of Cu-MWCNTs nanocomposites is the uniform dispersion of the CNTs in the Cu matrix, which was addressed by incorporating nanostructured Cu, leading to the homogeneous distribution of CNTs and good bonding between the CNTs and the Cu matrix. A significant improvement in relative density and microhardness with &lt;3 wt.% MWCNTs was observed compared to pure asreceived Cu and its composites. The hardness of Cu-3 wt.% MWCNTs nanocomposite developed using nanostructured Cu were achieved at &lt;800 MPa, which is about 2.3 times higher than that of the as-received Cu sample (~ 359 MPa). The significant increment in mechanical and wear properties mainly originates from fine-grain strengthening effects and solid solution strengthening. The wear mechanisms in the various nanostructured Cu-MWCNTs composites were studied in detail and oxidation wear was identified as one of the main wear mechanisms.