Mechanical properties of iron matrix composites reinforced by copper-coated hybrid ceramic particles
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We investigated improvements to the mechanical properties of iron matrix composites for the case where the surfaces of the reinforcing particles are coated with copper and a hybrid mixture of different types of reinforcing ceramic particles (hybrid particles mixture) is used. Copper coating on the surfaces of SiC, TiC, and TiN particles can eliminate interfacial defects to significantly improve the composites’ mechanical properties. The addition of uncoated hybrid particles mixture has little effect on the tensile strength improvement of composites compared with composites reinforced by monolithic particles, whereas copper-coated hybrid reinforcement has a significant effect. Any composite reinforced with copper-coated hybrid particles mixture will always have higher strength than that reinforced with monolithic particles. Our findings suggest that the load transfer between the matrix and reinforcing particles improved because of different elastic moduli, coefficients of thermal expansion and reaction heats of different types of reinforcing particles.
Contributing Editor: Jürgen Eckert a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2015.208
highest value reported so far.13–15 Further research may lead to improvements in mechanical properties by adjusting the microstructure and processing details, such as particle surface treatment and green compact preparation as per the DTRHP technology. The matrix–reinforcements interface is a key factor influencing the mechanical properties of PRIMCs.16–19 The effect of nickel coating on particle reinforcement was found to benefit interfacial bonding, which results in a higher mechanical response of metal matrix composites.20,21 Few studies have reported the effect of copper coating on the mechanical properties of iron matrix composites, and electroless copper coating on ceramic particles has been proven to be a low-cost and easycontrolled technology compared with nickel coating.22 Ceramic particles such as SiC, TiC, and TiN are commonly used as reinforcements in metal matrix composites owing to their good physical and chemical properties.23–25 Variations in the reinforcement volume fraction, size, type, and sintering process substantially affect the mechanical properties of PRIMCs.6,26–28 Because the effect of different individual types of reinforcing particles on the mechanical properties of PRIMCs has been reported3,27,29 using various processing technologies, we cannot conclusively determine the best material. A comparison of different reinforcement types on the mechanical properties of PRIMCs using a single processing technique is required. Only a few studies have considered hybrid ceramic particles of different types for metal matrix composites.30–32 An aluminum matrix composite reinforced by TiB2 and Al2O3 particles mixture was reported to have
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Ó Materials Research Society 2015
I. INTRODUCTION
Ceramic particle reinforced iron matrix composites (PRIMCs) offer many opportunities for developing new materials by combining phys
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