Al-based composites reinforced with AlB 2 , AlN and BN phases: Experimental and theoretical studies

Particulate-reinforced metal matrix composites are of particular interest because of their ease of fabrication, low cost, and isotropic properties. Friction stir processing offers a promising alter...

Particulate metal matrix composites and their fabrication via friction stir processing – a review

This study deals with the tribological properties of 2 wt.% of SiC and x wt.% of Gr (x = 0, 0.5, 1, 1.5, 2, and 3) nanoparticles reinforced Al6061 alloy fabricated through ultrasonically assisted casting technique. Microstructure, various elements, particle sizes, phases, worn surfaces, wear debris are analyzed to understand the tribological behaviour of hybrid nanocomposites. Microstructural studies revealed the uniform dispersion of SiC and Gr nano-reinforcements in the matrix. Nano-clusters appeared in the micrographs with the increase of Gr nanoparticles. Density and microhardness of Al6061–2SiC-xGr hybrid nanocomposites decreased with the rise of Gr in the composite material. Influence of Gr content on the wear rate and coefficient of friction of hybrid nanocomposites are studied. Pin-on-disc apparatus is used to carry out the experiments at 5–20 N normal load, 0.5–2 m/s sliding velocity and 1000–3000 m sliding distance. The wear rate and coefficient of friction of hybrid nanocomposites reduced with the rise of nano Gr content up to a critical value and then increased. The reduction of wear rate for Al6061–2SiC-xGr (x = 0.5, 1, 1.5, 2, and 3) hybrid nanocomposites compared to AA6061 alloy at higher tribological conditions is 20%, 40.2%, 47.3%, 57%, 73%, and 64% respectively. Similarly the reduction in coefficient of friction for Al6061–2SiC-xGr (x = 0.5, 1, 1.5, 2, and 3) hybrid nanocomposites compared to Al6061 alloy is 3%, 5.9%, 11.8%, 17.7% and 9% respectively. The wear debris size decreased with the rise of Gr content in the Al6061–2SiC nanocomposite.

Tribological Behaviour of Al6061–2SiC-xGr Hybrid Metal Matrix Nanocomposites Fabricated through Ultrasonically Assisted Stir Casting Technique

Wear and microhardness behaviors of AA7075/SiC-BN hybrid nanocomposite surfaces fabricated by friction stir processing

Optimization of powder metallurgy parameters to obtain low corrosion rate and high compressive strength in Al-MoO3 composites using SN ratio and ANOVA analysis

Silicon Carbide Reinforced Aluminium Metal Matrix Nano Composites-A Review

Two-body abrasion wear rate of AA6061 aluminium alloy, AA6061-2SiC nanocomposite, and AA6061-2SiC-2Gr hybrid nanocomposites were studied using a pin on disc machine at various applied normal loads ...

Two-body abrasive wear behaviour of AA6061-2SiC-2Gr hybrid nanocomposite fabricated through ultrasonically assisted stir casting

Al6061 alloy-based hybrid nanocomposites reinforced with 2wt% SiC and x wt% of graphite (x = 0, 0.5, 1, 1.5, 2 and 3) nanoparticles are fabricated through ultrasonically assisted casting technique. Microstructure, phases, grain size and fracture surfaces of the hybrid nanocomposites are studied to understand the mechanical properties. Microstructural studies revealed the uniform distribution of SiC and graphite nano-reinforcements in the matrix. The small-scale clusters appeared in the microstructure with the increase in graphite nanoparticles. The grain size, density, hardness and ultimate tensile strength of hybrid nanocomposites decreased with the rise of graphite in the composite material. The yield strength of the hybrid nanocomposites increased with increase in graphite up to 2 wt% and then decreased. SiC and graphite dual phase nanoparticles’ strengthening effect on yield strength was theoretically evaluated using various strengthening mechanisms including porosity effect. Enhancement of yield strength in hybrid nanocomposite due to strengthening mechanisms followed the trend $$\Delta \sigma_{{\Delta {\text{CTE}}}} > \Delta \sigma_{\text{Orowan}} > \Delta \sigma_{\text{HP}} > \Delta \sigma_{\text{load}}$$
 . The predicted yield strength of hybrid nanocomposites obtained using the modified Clyne model and quadratic summation model were close to the experimental values. Fracture surfaces of hybrid nanocomposites exhibited brittle fracture with interdendritic cracking, stepwise facets and particle pull out with the increase in graphite content in the matrix.

Strengthening and Mechanical Properties of SiC and Graphite Reinforced Al6061 Hybrid Nanocomposites Processed Through Ultrasonically Assisted Casting Technique

Global requirement for minimum cost, high efficiency, and good grade materials has made a diversion in research from base alloys to composite materials, since the last five decades. In the case of metal matrix composites, aluminium metal matrix composites have been certified and steadily advanced due to properties such as high strength, low density, and high wear resistance. They are widely used in automobile industry, aircraft industry, structural applications, and many other defence systems. Researchers have observed that the addition of nano-size SiCNP reinforcements to aluminium-based matrix yields superior properties and good bonding characteristics between matrix and reinforcements of nanocomposites. Along with silicon carbide particulate primary nano-reinforcements, researchers studied the properties of aluminium metal matrix nanocomposites with the addition of secondary reinforcements. These hybrid nanocomposites exhibited improved wear resistance. This article reviews the fabrication methods, mec...

A. Prasad Reddy

Papers

Silicon Carbide Reinforced Aluminium Metal Matrix Nano Composites-A Review

Tribological Behaviour of Al6061–2SiC-xGr Hybrid Metal Matrix Nanocomposites Fabricated through Ultrasonically Assisted Stir Casting Technique

Two-body abrasive wear behaviour of AA6061-2SiC-2Gr hybrid nanocomposite fabricated through ultrasonically assisted stir casting

Strengthening and Mechanical Properties of SiC and Graphite Reinforced Al6061 Hybrid Nanocomposites Processed Through Ultrasonically Assisted Casting Technique

Al/SiCNP and Al/SiCNP/X nanocomposites fabrication and properties: A review: