Aluminum Metal Matrix Composites (MMCs) sought over other conventional materials in the field of aerospace, automotive and marine applications owing to their excellent improved properties. These materials are of much interest to the researchers from few decades. These composites initially replaced Cast Iron and Bronze alloys but owing to their poor wear and seizure resistance, they were subjected to many experiments and the wear behavior of these composites were explored to a maximum extent and were reported by number of research scholars for the past 25 years. In this paper an attempt has been made to consolidate some of the aspects of mechanical and wear behavior of Al-MMCs and the prediction of the Mechanical and Tribological properties of Aluminum MMCs.

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Mechanical and Tribological Behavior of Particulate Reinforced Aluminum Metal Matrix Composites – a review

Morphological evolution and growth mechanism of primary Mg2Si phase in Al–Mg2Si alloys

‘The micro/nano reinforced particle’ aluminum metal matrix composites (Al-MMCs) are widely used in manufacturing sector due to light-weight, superior strength-to-weight ratio, better fracture tough...

Developments in the aluminum metal matrix composites reinforced by micro/nano particles – A review:

In situ composites are a class of composite materials in which the reinforcement is formed within the matrix by reaction during the processing. In situ method of composite synthesis has been widely followed by researchers because of several advantages over conventional stir casting such as fine particle size, clean interface, and good wettability of the reinforcement with the matrix and homogeneous distribution of the reinforcement compared to other processes. Besides this, in situ processing of composites by casting route is also economical and amenable for large scale production as compared to other methods such as powder metallurgy and spray forming. Commonly used reinforcements for Al and its alloys which can be produced in situ are Al2O3, AlN, TiB2, TiC, ZrB2, and Mg2Si. The aim of this paper is to review the current research and development in aluminum-based in situ composites by casting route.

Aluminum-Based Cast In Situ Composites: A Review

This study reviews NiO film deposition using the Spray Pyrolysis Technique (SPT). Physical and chemical methods can be used to deposit NiO film. This review looks at different precursors and their characterization methods for spray deposition of NiO thin film. The usefulness of SPT emanates from this method being simple, low cost, and viable for mass production. It gives high product purity for metallic and non-metallic material deposition. Nickel chloride, nickel acetate, nickel nitrate, nickel hydroxide, nickel sulfate, and nickel formate are the major precursors for NiO thin film deposition. Nickel chloride and nickel acetate are the most used and highly available precursors. Unlike nickel acetate, nickel chloride precursors corrode the deposition equipment (spray gun). These precursors are relatively cheap compared to current materials used for solar panels (cells). SPT equipment consumes negligible power during deposition and none after usage. Various authors have investigated the physical, chemical, optical, structural characterization and properties of nanostructured NiO thin film. NiO films are p-type semiconductors and as such possesses direct band gap suitable for various applications. The film has been categorized as an excellent material for optoelectronic applications because of its tune-ability for optimization. The wide band gap is in the range of 3.25–4.0 eV. This review will be useful to researchers exploring solar photovoltaic potentials for solving electricity problems of developing countries.

Review of nanostructured NiO thin film deposition using the spray pyrolysis technique

The effects of phosphorus on primary, eutectic Mg2Si phases and growth manner of Mg2Si crystal in Mg2Si/Al composite with steel die and sand mould cast are investigated. The results show that, with the addition of phosphorus, the morphologies of primary Mg2Si particulates changed from dendritic or equiaxed to polygonal shape, and their sizes decrease from ∼300 μm and 200 μm to ∼20 μm and ∼50 μm, respectively. Furthermore, the morphologies of eutectic Mg2Si phases change from fibriform to short fibriform and/or dot-like, while the eutectic Si phases do not change obviously. The exact morphologies of Mg2Si crystals are identified as tetrakaidecahedron and/or octahedron after modification with P, due to V[1 0 0] is depressed. Also, growth mechanism and the formation of hopper-like crystal are discussed.

Effect of phosphorus on microstructure and growth manner of primary Mg2Si crystal in Mg2Si/Al composite

Strontium modification and formation of cubic primary Mg2Si crystals in Mg2Si/Al composite

Microstructure of the Ce-modified in situ Mg2Si/Al–Si–Cu composite

An in situ Mg 2 Si/Al–Si–Cu composite with semisolid structure was fabricated by cooling slope cast and partial remelting process. The as-cast microstructure, and effect of isothermal holding time on the morphology, size and shape factor of the grains were investigated. The results show that the morphology of primary Mg 2 Si and α-Al grains in the composite are globular and/or elliptic after partial remelting process. The size and shape factor of α-Al grains increase with the isothermal holding time.

Y.G. Zhao

Papers

Effect of phosphorus on microstructure and growth manner of primary Mg2Si crystal in Mg2Si/Al composite

Strontium modification and formation of cubic primary Mg2Si crystals in Mg2Si/Al composite

Microstructure of the Ce-modified in situ Mg2Si/Al–Si–Cu composite

Semisolid microstructure of Mg2Si/Al composite by cooling slope cast and its evolution during partial remelting process

Effects of melt superheating treatment on microstructure of Mg2Si/Al–Si–Cu composite