Effect of plain strain deformation on grain strengthening mechanism of Fe-Al2O3 metal matrix nanocomposites

The present paper reports the effect of plain strain deformation on grain strengthening mechanism of iron (Fe) - alumina (Al2O3) Metal Matrix Nanocomposites (MMNCs) fabricated through powder metallurgical (P/M) processing. Specimens for the present study were weighed in required amount, ball milled, compacted at a load of 5, 6 and 7 tons followed by sintering in an atmospheric controlled furnace at 1100 °C for 1 hour. Plain strain deformation of samples was carried out at a load of 5 tons under different interfacial condition i.e. dry, solid lubricant and liquid lubricant. XRD studies reveal the formation of iron, alumina and nano iron-aluminate (FeAl2O4) phases respectively. Maximum average sintered density investigated for the specimen is found to be 4.6179 gm/cc compacted under 7 tons of load and minimum sintered density is found to be 4.4572 gm/cc for specimen compacted under 5 tons of load. Overall, fabricated Fe-Al2O3 metal matrix nanocomposites with powder metallurgy route when characterized for plain strain deformation shows strengthening between grain and grain boundary which can be a good candidate material for application in railways especially while designing railway structures and tracks.

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Sintering and Hardness Behavior of Fe-Al2O3 Metal Matrix Nanocomposites Prepared by Powder Metallurgy

Journal of Composites ◽

10.1155/2014/145973 ◽

2014 ◽

Vol 2014 ◽

pp. 1-10 ◽

Cited By ~ 11

Author(s):

Pallav Gupta ◽

Devendra Kumar ◽

Om Parkash ◽

A. K. Jha

Keyword(s):

Powder Metallurgy ◽

Mechanical Behavior ◽

Metal Matrix ◽

Processing Parameters ◽

Inert Atmosphere ◽

Industrial Applications ◽

Reactive Sintering ◽

Metal Matrix Nanocomposites ◽

Matrix Nanocomposites ◽

Powder Metallurgy Route

The present paper reports the investigations on sintering and hardness behavior of Fe-Al2O3 Metal Matrix Nanocomposites (MMNCs) prepared by Powder Metallurgy (P/M) route with varying concentration of Al2O3 (5–30 wt%). The MMNC specimens for the present investigations were synthesized by ball milling, followed by compaction and sintering in an inert atmosphere in the temperature range of 900–1100°C for 1–3 hours using Powder Metallurgy route. Phase and microstructures of the specimens were characterized by XRD and SEM. Reactive sintering takes place in these materials. During sintering nano iron aluminate (FeAl2O4) phase forms. Characterization was done by measuring density and hardness. Results have been discussed critically to illustrate the effect of various processing parameters on sintering and mechanical behavior. It is expected that the results of these investigations will be useful in developing Metal Matrix Nanocomposites (MMNCs) for typical industrial applications.

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Challenges in Manufacturing Aluminium Based Metal Matrix Nanocomposites via Stir Casting Route

Materials Science Forum ◽

10.4028/www.scientific.net/msf.736.72 ◽

2012 ◽

Vol 736 ◽

pp. 72-80 ◽

Cited By ~ 5

Author(s):

Subhranshu Chatterjee ◽

Amitava Basu Mallick

Keyword(s):

Metal Matrix ◽

Settling Velocity ◽

Strengthening Mechanism ◽

Stir Casting ◽

Theoretical Concepts ◽

Metal Matrix Nanocomposites ◽

Theoretical Predictions ◽

Matrix Nanocomposites ◽

Grain Refinement Strengthening

The influence of material processing conditions for preparing aluminium based metal matrix nanocomposites through stir casting route is reviewed. The role of particle size with respect to Brownian motion, Stokes settling velocity and strengthening mechanism is assessed from theoretical understandings. Variation of microstructural features and mechanical properties of the nanocomposites are predicted from theoretical concepts and related mathematical models. Experiments conducted to validate the theoretical predictions show that both Orowan and grain refinement strengthening mechanisms remain operative which is the key to the improved strength property of the nanocomposites.

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Graphene-based metal matrix nanocomposites: Recent development and challenges

Journal of Composite Materials ◽

10.1177/0021998320988566 ◽

2021 ◽

pp. 002199832098856

Author(s):

Rachit Ranjan ◽

Vivek Bajpai

Keyword(s):

Metal Matrix Composites ◽

Metal Matrix ◽

Matrix Material ◽

Strengthening Mechanism ◽

Special Focus ◽

Matrix Composites ◽

Metal Matrix Nanocomposites ◽

Research Gap ◽

New Research ◽

Matrix Nanocomposites

This articles reviews till-date available literature on metal matrix composites reinforced with graphene, CNT and other carbonaceous materials. The article has a special focus on the mechanical, tribological and challenges associated with the fabrication of nanocomposites. Simultaneously, it reviews the synthesis, strengthening mechanism and applications of graphene along with research gap associated with graphene metal matrix nanocomposites (GMMNC). Carbonaceous nanofillers, e.g. Graphene, are known to have extraordinary mechanical, thermal and electrical properties along with multifaceted characteristics. These materials have the potential to become an ideal material in numerous application which requires reinforcement. Graphene nanoplatelets (GNP) suffers various challenges starting from its synthesis to the uniform distribution within the matrix material. Our concern is to give details on the challenges associated with graphene and metal matrix composites along with the solution so that new research can be done at its ease. Section 1 of the article gives a detailed analysis of various carbonaceous reinforcement materials. Preparation, processing and dispersion technique for graphene and composite material is given in section 2. Section 3 of the article deals with different matrix material used in MMNC along with the properties and challenges associated with it in tabulated form. Strengthening mechanism used for the enhancement of mechanical properties of composites is described in section 4, whereas, Section 5 deals with the applications and Research gap.

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Fabrication and Characterization of the Modified EV31-Based Metal Matrix Nanocomposites

Metals ◽

10.3390/met11010125 ◽

2021 ◽

Vol 11 (1) ◽

pp. 125

Author(s):

Seyed Kiomars Moheimani ◽

Mehran Dadkhah ◽

Mohammad Hossein Mosallanejad ◽

Abdollah Saboori

Keyword(s):

Thermal Expansion ◽

Mechanical Strength ◽

Metal Matrix ◽

Coefficient Of Thermal Expansion ◽

Structural Effect ◽

Metal Matrix Nanocomposites ◽

Mechanical Stirring ◽

Specific Strength ◽

The Matrix ◽

Matrix Nanocomposites

Metal matrix nanocomposites (MMNCs) with high specific strength have been of interest for numerous researchers. In the current study, Mg matrix nanocomposites reinforced with AlN nanoparticles were produced using the mechanical stirring-assisted casting method. Microstructure, hardness, physical, thermal and electrical properties of the produced composites were characterized in this work. According to the microstructural evaluations, the ceramic nanoparticles were uniformly dispersed within the matrix by applying a mechanical stirring. At higher AlN contents, however, some agglomerates were observed as a consequence of a particle-pushing mechanism during the solidification. Microhardness results showed a slight improvement in the mechanical strength of the nanocomposites following the addition of AlN nanoparticles. Interestingly, nanocomposite samples were featured with higher electrical and thermal conductivities, which can be attributed to the structural effect of nanoparticles within the matrix. Moreover, thermal expansion analysis of the nanocomposites indicated that the presence of nanoparticles lowered the Coefficient of Thermal Expansion (CTE) in the case of nanocomposites. All in all, this combination of properties, including high mechanical strength, thermal and electrical conductivity, together with low CTE, make these new nanocomposites very promising materials for electro packaging applications.

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Wettability in Metal Matrix Composites

Metals ◽

10.3390/met11071034 ◽

2021 ◽

Vol 11 (7) ◽

pp. 1034

Author(s):

Massoud Malaki ◽

Alireza Fadaei Tehrani ◽

Behzad Niroumand ◽

Manoj Gupta

Keyword(s):

Metal Matrix Composites ◽

Metal Matrix ◽

Aluminum Matrix ◽

Interfacial Strength ◽

High Strength ◽

Aluminum Matrix Composites ◽

Matrix Composites ◽

Metal Matrix Nanocomposites ◽

Aerospace Applications ◽

Matrix Nanocomposites

Metal matrix composites (MMCs) have been developed in response to the enormous demand for special industrial materials and structures for automotive and aerospace applications, wherein both high-strength and light weight are simultaneously required. The most common, inexpensive route to fabricate MMCs or metal matrix nanocomposites (MMNCs) is based on casting, wherein reinforcements like nanoceramics, -carbides, -nitrides, elements or carbon allotropes are added to molten metal matrices; however, most of the mentioned reinforcements, especially those with nanosized reinforcing particles, have usually poor wettability with serious drawbacks like particle agglomerations and therefore diminished mechanical strength is almost always expected. Many research efforts have been made to enhance the affinity between the mating surfaces. The aim in this paper is to critically review and comprehensively discuss those approaches/routes commonly employed to boost wetting conditions at reinforcement-matrix interfaces. Particular attention is paid to aluminum matrix composites owing to the interest in lightweight materials and the need to enhance the mechanical properties like strength, wear, or creep resistance. It is believed that effective treatment(s) may enormously affect the wetting and interfacial strength.

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