Enhanced precipitation hardening in an alumina reinforced Al–Cu alloy matrix composite

Yu, Peng; Kwok, Chun Kit; To, C.Y.; Li, T.K.; Ng, Dickon H. L.

doi:10.1016/j.compositesb.2007.01.010

Cited by 16 publications

(5 citation statements)

References 14 publications

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“…The increased microhardness of the Cu-NbC composites over than that of pure copper may be due to the composites' incorporation of NbC hard phase. In a metal matrix composite material, the reinforcement phase prevents plastic deformation by blocking the dislocation movement in the matrix phase under mechanical loading [29,30]. In Cu-NbC composite, the copper matrix was first deformed upon applying the load, whilst NbC acted as obstacles to the moving dislocations in the copper matrix, leading to an increase in microhardness of the composite.…”

Section: Effect Of Nbc Volume Fraction On Microhardnessmentioning

confidence: 99%

Spark plasma sintering of mechanically alloyed in situ copper–niobium carbide composite

Long

Othman

Umemoto

et al. 2010

Journal of Alloys and Compounds

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Section: Effect Of Nbc Volume Fraction On Microhardnessmentioning

confidence: 99%

Spark plasma sintering of mechanically alloyed in situ copper–niobium carbide composite

Long

Othman

Umemoto

et al. 2010

Journal of Alloys and Compounds

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“…In addition, as the samples were subjected to the rapid heating and cooling in the consolidation processing by the SPS method, thermally activated dislocations are created due to the CTE mismatch between metallic matrix (Cu; 6.6 × 10 −6 1/°C) and nanoceramic (NbC; 17.1 × 10 −6 1/°C). Furthermore, the reinforcing agent hinders the plastic deformation by pinning the dislocation movement in the matrix phase (Orowan model) 29,30 . Once the Cu–NbC nanocomposite is loaded, the copper matrix deforms first, while the NbC nanoparticles act as obstacles to pin the dislocations in the copper matrix, forming the dislocation pile‐ups.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the reinforcing agent hinders the plastic deformation by pinning the dislocation movement in the matrix phase (Orowan model). 29,30 Once the Cu-NbC nanocomposite is loaded, the copper matrix deforms first, while the NbC nanoparticles act as obstacles to pin the dislocations in the copper matrix, forming the dislocation pile-ups. Higher concentrations of NbC reinforcement enhance the resistance to the movement of dislocations, leading to an increase in the strength of the nanocomposite.…”

Section: Preparation Of Cu-nbc Nanocomposite and Evaluation Of Mechan...mentioning

confidence: 99%

The effects of NbC nanoparticles synthesized by combustion method on the mechanical properties of Cu–NbC nanocomposite

Moghim

Jalaly

Sadeghzadeh

2022

Int J Applied Ceramic Tech

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In the first stage of this work, the master nanocomposite of niobium carbide (NbC)-Cu (ceramic-based nanocomposite) was synthesized by a mechanically induced magnesiothermic combustion in the Nb 2 O 5 /CuO/Mg/C system. Ignition time in this system was recorded to be ∼28 min of milling. In the second stage, appropriate amounts of NbC-Cu nanocomposite powder were mixed with pure copper powder to prepare Cu-based nanocomposite with 0, 5, 10, 15, and 20 volume fraction of NbC. The final metal matrix nanocomposite powder was sintered by spark plasma sintering method. The density of nanocomposite specimens decreased with increasing the percentage of NbC nanoparticles, while the microhardness of specimens increased with increasing nano-NbC content. Regarding the tensile test, the sample Cu-10 vol.% NbC nanocomposite with a strength of 372 MPa (∼63% higher than that of nonreinforced copper) was the best composition, and the nanocomposite strength decreased at higher NbC concentrations, mostly due to the agglomeration and nonhomogeneous distribution of reinforcing nanoparticles.

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“…In situ synthesis has been extensively utilized to produce particle-reinforced metals for strong interfacial contact between the reinforcement and the Al matrix, effective control of the size of the in situ particles as well as the level of reinforcement, which yields better tailorability of the properties [5]. One commonly adopted in situ method involves a reaction between Al and a metal oxide, such as CuO [6], Fe 2 O 3 [7], Ti 2 O [8] and ZnO [9], to produce Al 2 O 3 particle reinforcements. CuO is one of the most widely used metal oxides because fine in situ Al 2 O 3 particles can be successfully synthesized in the Al/CuO systems and the reduced Cu can react with Al to form intermetallic phases that can act as reinforcements in the composite matrix [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of CuO Particle Size on the Microstructure Evolution of Al2O3P/Al Composites Prepared Via Displacement Reactions in the Al/CuO System

Zhao

Shi

Zhang

2015

Acta Metall. Sin. (Engl. Lett.)

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An Al 2 O 3P /Al composite was successfully synthesized using a displacement reaction between 80 wt% Al and 20 wt% CuO powders at a heating rate of 5°C/min. Two different sizes CuO particles were used, and all the experiments were conducted under an argon atmosphere. To analyze the microstructural evolution during synthesis, the Al-20 wt% CuO samples were heated to the temperatures selected according to the differential scanning calorimetry curve and then immediately quenched with water. The phase composites and microstructure of the water-quenching samples were investigated using X-ray diffraction, optical microscopy, scanning electron microscopy and energy-dispersive spectrometry.The results indicate that the CuO particle size has a significant effect on the microstructural evolution of the samples during the heating stage and on the microstructure of synthesized composites. Smaller CuO particles can decrease the reaction temperature, narrow the reaction temperature range at the different reaction stages during the heating stage and make the size and distribution of in situ Al 2 O 3 particles more uniform. The reaction between Al and CuO can be complete as the temperature rises to 900°C. The size of the in situ Al 2 O 3 particles is approximately 5 lm when the size of the CuO particles is less than 6 lm. This sample has a relatively high Rockwell hardness of 60 HRB.

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Enhanced precipitation hardening in an alumina reinforced Al–Cu alloy matrix composite

Cited by 16 publications

References 14 publications

Spark plasma sintering of mechanically alloyed in situ copper–niobium carbide composite

Spark plasma sintering of mechanically alloyed in situ copper–niobium carbide composite

The effects of NbC nanoparticles synthesized by combustion method on the mechanical properties of Cu–NbC nanocomposite

Effect of CuO Particle Size on the Microstructure Evolution of Al2O3P/Al Composites Prepared Via Displacement Reactions in the Al/CuO System

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