Consolidation of a Cu–2.5vol.% Al2O3 powder using high energy mechanical milling

Zhang, Deliang; Raynova, Stiliana Rousseva; Koch, Carl C.; Scattergood, R.O.; Youssef, Khaled M.

doi:10.1016/j.msea.2005.08.109

Cited by 25 publications

(7 citation statements)

References 18 publications

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“…For conventional Al-based composites, when incorporating smaller reinforcing particles to metal matrix, inhomogeneous dispersion, settling of reinforcements and poor wettability in the metal matrix are inevitable and subsequent treatment of thermomechanical processes are not effective to eliminate entirely these drawbacks (Ozdemir et al, 2000;Lee et al, 2001). On the other hand, recently it has been shown that several composites having a nanometric grain and reinforcing particles of finer size with a more uniform distribution in the matrix can be syn- thesized by high-energy ball milling process (HEM) (Prabhu et al, 2006;Zhang et al, 2005;El-Eskandarany, 1998;Osso et al, 1998;Huang et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Nanocrystalline Al–Al2O3p and SiCp composites produced by high-energy ball milling

Özdemir

Ahrens

Mücklich

et al. 2008

Journal of Materials Processing Technology

101

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Section: Introductionmentioning

confidence: 99%

Nanocrystalline Al–Al2O3p and SiCp composites produced by high-energy ball milling

Özdemir

Ahrens

Mücklich

et al. 2008

Journal of Materials Processing Technology

101

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“…The achievement of high fracture toughness as well as low processing cost requires small size of particle and particulate Al 2 O 3 phase. In the literature [1][2][3][4][5][6][7][8] several synthetic procedures are used for the production particulatereinforced Cu-Al 2 O 3 metal matrix composites that mainly include the addition of Al 2 O 3 into the Cu melt followed by casting and internal oxidation of Cu-Al alloy nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

“…Based on these properties, Zhang et al [8] synthesized consolidated Cu-2.5 vol.% Al 2 O 3 powder. It was proved that the formation of lumps results in the incorporation of Al 2 O 3 fine particles into the Cu matrix forming a composite structure.…”

Section: Introductionmentioning

confidence: 99%

Nanomechanical properties and thermal decomposition of Cu-Al₂O₃composites for FGM applications

et al. 2016

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-It is widely reported that copper-alumina (Cu-Al 2 O 3 ) nanocomposite materials exhibit high potential for use in structural applications in which enhanced mechanical characteristics are required. The investigation of Cu-Al 2 O 3 nanocomposites which are to form a functionally graded material (FGM) structure in terms of nanomechanical/structural integrity and thermal stability is still scarce. In this work, fully characterized nanosized Al 2 O 3 powder has been incorporated in Cu matrix in various compositions (2, 5 and 10 wt.% of Al 2 O 3 content). The produced composites were evaluated in terms of their morphology, structural analysis, thermal behavior, nanomechanical properties and their extent of viscoplasticity. The results reveal that all nanocomposites degrade at elevated temperatures; increased surface mass gain with decreasing Al 2 O 3 content was observed, while no such difference of % mass gain in 5 and 10 wt.% of Al and Al 2 O 3 content in Cu was observed. The increase of Al 2 O 3 wt.% content results in thermal stability enhancement of the nanocomposites. The thermal decomposition process of the material is reduced in the presence of 10 wt.% of Al 2 O 3 content. This result for the matrix decomposition can be explained by a decrease in the diffusion of oxygen and volatile degradation products throughout the composite material due to the incorporation of Al and Al 2 O 3 . The Al 2 O 3 powder enhances the overall thermal stability of the system. All samples exhibited significant pile-up of the materials after nanoindentation testing. Increasing the wt.% of Al 2 O 3 content was found to increase the creep deformation of the samples as well as the hardness and elastic modulus values.

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“…Besides alloying, ceramic oxide dispersion in the Cu matrix is known to improve mechanical properties of Cu alloys and enable retention of strength at high temperature generated during use (i.e., Joule heating, friction, and wear). [28][29][30][31][32] Nanometric materials are characterized by a unique microstructure comprising ultrafine crystallites/domains and very high specific surface/interfacial area of the crystallites that account for a host of novel properties not feasible in their coarse-grained counterparts. [33,34] Siegel [33] compared this microstructural state of having an almost equal number of atoms constituting nanometric crystallites and very high surface/volume fraction of interfaces/interfacial regions with ''bimodal'' distribution of grain body and boundary phases.…”

Section: Introductionmentioning

confidence: 99%

Development of Wear-Resistant Cu-10Cr-3Ag Electrical Contacts with Nano-Al2O3 Dispersion by Mechanical Alloying and High Pressure Sintering

Bera

Lojkowsky

Manna

2009

Metall Mater Trans A

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Cu-10Cr-3Ag (wt pct) alloy with nanocrystalline Al 2 O 3 dispersion was prepared by mechanical alloying and consolidated by high pressure sintering at different temperatures. Characterization by X-ray diffraction and scanning electron microscopy or transmission electron microscopy shows the formation of nanocrystalline matrix grains of about 40 nm after 25 hours of milling with nanometric (<20 nm) Al 2 O 3 particles dispersed in it. After consolidation by high pressure sintering (8 GPa at 400°C to 800°C), the dispersoids retain their ultrafine size and uniform distribution, while the alloyed matrix undergoes significant grain growth. The hardness and wear resistance of the pellets increase significantly with the addition of nano-Al 2 O 3 particles. The electrical conductivity of the pellets without and with nano-Al 2 O 3 dispersion is about 30 pct IACS (international annealing copper standard) and 25 pct IACS, respectively. Thus, mechanical alloying followed by high pressure sintering seems a potential route for developing nano-Al 2 O 3 dispersed Cu-Cr-Ag alloy for heavy duty electrical contact.

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Consolidation of a Cu–2.5vol.% Al2O3 powder using high energy mechanical milling

Cited by 25 publications

References 18 publications

Nanocrystalline Al–Al2O3p and SiCp composites produced by high-energy ball milling

Nanocrystalline Al–Al2O3p and SiCp composites produced by high-energy ball milling

Nanomechanical properties and thermal decomposition of Cu-Al₂O₃composites for FGM applications

Development of Wear-Resistant Cu-10Cr-3Ag Electrical Contacts with Nano-Al2O3 Dispersion by Mechanical Alloying and High Pressure Sintering

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Consolidation of a Cu–2.5vol.% Al2O3 powder using high energy mechanical milling

Cited by 25 publications

References 18 publications

Nanocrystalline Al–Al2O3p and SiCp composites produced by high-energy ball milling

Nanocrystalline Al–Al2O3p and SiCp composites produced by high-energy ball milling

Nanomechanical properties and thermal decomposition of Cu-Al2O3composites for FGM applications

Development of Wear-Resistant Cu-10Cr-3Ag Electrical Contacts with Nano-Al2O3 Dispersion by Mechanical Alloying and High Pressure Sintering

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About

Nanomechanical properties and thermal decomposition of Cu-Al₂O₃composites for FGM applications