Densification, microstructure and properties of supersolidus liquid phase sintered 6711Al-SiC metal matrix composites

Padmavathi, C.; Upadhyaya, Anish

doi:10.2298/sos1003363p

Cited by 38 publications

(20 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The literature describes that press-sintering process is only a feasible technique if a low GNPs content is used in the composite. Otherwise, consolidation during sintering will be challenging [82,83]. For MMNCs with GNP content higher than 4 vol %, to reach full densification, an external pressure assisted method should be used.…”

Section: Consolidation and Sintering (Third Challenge)mentioning

confidence: 99%

An Overview of Key Challenges in the Fabrication of Metal Matrix Nanocomposites Reinforced by Graphene Nanoplatelets

Saboori

Moheimani

Dadkhah

et al. 2018

Metals

View full text Add to dashboard Cite

This article provides an overview of research efforts with an emphasis on the fabrication of metal matrix nanocomposites (MMNCs) reinforced by graphene nanoplatelets (GNPs). Particular attention is devoted to finding the challenges in the production of MMNCs through the powder metallurgy techniques. The main technical challenges can be listed as: (I) reinforcement selection; (II) dispersion of reinforcement within the matrix; (III) reactivity between the reinforcement and matrix; (IV) interfacial bonding; (V) preferred orientation of reinforcement. It is found that some of these difficulties can be attributed to the nature of the materials involved, while the others are related to the preparation routes. It is reported that the challenges related to the process can often be addressed by changing the production process or by using post-processing techniques. More challenging issues instead are related to the composition of the matrix and reinforcement, their reactivity and the dispersion of reinforcement. These topics still bring significant challenges to the materials scientists, and it would be worth mentioning that the fabrication of MMNCs with a uniform dispersion of reinforcement, strong interfacial bonding, without detrimental reactions and improved isotropic properties is still a puzzling issue.

show abstract

Section: Consolidation and Sintering (Third Challenge)mentioning

confidence: 99%

An Overview of Key Challenges in the Fabrication of Metal Matrix Nanocomposites Reinforced by Graphene Nanoplatelets

Saboori

Moheimani

Dadkhah

et al. 2018

Metals

View full text Add to dashboard Cite

show abstract

“…It has to be mentioned that the residual porosity observed on the specimens with 5 and 10 vol% after pre-treatment ( Figure 7 d,e) also affects the electrical conductivity of these materials and, therefore, the anodizing process. Moreover, Srivastava et al [ 36 ] and Padmavathi et al [ 37 ] found that the electrical conductivity of Al/SiC p decreases with the increase in the volume fraction of the SiC p , not only due to the addition of a phase with lower conductivity than the Al matrix, but also because when high volume fractions of reinforcement particles are present, reinforcement clusters and porosity are often observed to decrease the electrical conductivity of the composite material.…”

Section: Resultsmentioning

confidence: 99%

Anodization Mechanism on SiC Nanoparticle Reinforced Al Matrix Composites Produced by Power Metallurgy

et al. 2014

View full text Add to dashboard Cite

Specimens of aluminum-based composites reinforced by silicon carbide nanoparticles (Al/SiCnp) produced by powder metallurgy (PM) were anodized under voltage control in tartaric-sulfuric acid (TSA). In this work, the influence of the amount of SiCnp on the film growth during anodizing was investigated. The current density versus time response and the morphology of the porous alumina film formed at the composite surface are compared to those concerning a commercial aluminum alloy (AA1050) anodized under the same conditions. The processing method of the aluminum alloys influences the efficiency of the anodizing process, leading to a lower thicknesses for the unreinforced Al-PM alloy regarding the AA1050. The current density versus time response is strongly dependent on the amount of SiCnp. The current peaks and the steady-state current density recorded at each voltage step increases with the SiCnp volume fraction due to the oxidation of the SiCnp. The formation mechanism of the anodic film on Al/SiCnp composites is different from that occurring in AA1050, partly due the heterogeneous distribution of the reinforcement particles in the metallic matrix, but also to the entrapment of SiCnp in the anodic film.

show abstract

“…This is due to the alumina particles act as a barriers to the movement of grain boundaries and hence delay for the grain growth [36]. Padmavathi et al [22] states that up to 10 vol% of SiC reinforcement in 6711 Al alloy results uniform distribution of of SiC particles throughout the matrix, as the SiC percentage increases beyond 10 vol% resulted cluster formation. Upto optimum percentage of reinforcement into metallic matrix gives homogeneous microstructure.…”

Section: The Effect Of Particle Size On Microstructurementioning

confidence: 99%

The effect of process parameters in Aluminum Metal Matrix Composites with Powder Metallurgy

Vani

Chak

2018

Manufacturing Rev.

View full text Add to dashboard Cite

Metal Matrix Composites are developed in recent years as an alternative over conventional engineering materials due to their improved properties. Among all, Aluminium Matrix Composites (AMCs) are increasing their demand due to low density, high strength-to-weight ratio, high toughness, corrosion resistance, higher stiffness, improved wear resistance, increased creep resistance, low co-efficient of thermal expansion, improved high temperature properties. Major applications of these materials have been in aerospace, automobile, military. There are different processing techniques for the fabrication of AMCs. Powder metallurgy is a one of the most promising and versatile routes for fabrication of particle reinforced AMCs as compared to other manufacturing methods. This method ensures the good wettability between matrix and reinforcement, homogeneous microstructure of the fabricated MMC, and prevents the formation of any undesirable phases. This article addresses mainly on the effect of process parameters like sintering time, temperature and particle size on the microstructure of aluminum metal matrix composites.

show abstract

Densification, microstructure and properties of supersolidus liquid phase sintered 6711Al-SiC metal matrix composites

Cited by 38 publications

References 47 publications

An Overview of Key Challenges in the Fabrication of Metal Matrix Nanocomposites Reinforced by Graphene Nanoplatelets

An Overview of Key Challenges in the Fabrication of Metal Matrix Nanocomposites Reinforced by Graphene Nanoplatelets

Anodization Mechanism on SiC Nanoparticle Reinforced Al Matrix Composites Produced by Power Metallurgy

The effect of process parameters in Aluminum Metal Matrix Composites with Powder Metallurgy

Contact Info

Product

Resources

About