Essay Example on Desirable properties of weight savings better corrosion resistance and Mechanical









Introduction The desirable properties of weight savings better corrosion resistance and mechanical properties led aluminum and its composites AMC to be used primarily in the field of aerospace automobiles defense research sports and structural applications Rajmohan et al 1 Mordyuk et al 2 Beygi et al 3 The developments in the area of functionally graded material uplifted research in the field of hybrid metal matrix composites MMCs and low cost alloyed aluminum metal as a matrix for altering and obtaining desirable properties in the field of composites Saravanan et al 4 Alaneme et al 5 Hipke et al 6 Liu et al 7 Applications of MMCs increased due to the obtained tailored properties by adding desirable reinforcements in the form of ceramics including graphite mica silica zircon alumina and silicon carbide Silica reinforced aluminum composites are used for a variety of applications including manufacturing of pistons calipers and rotors due to an excellent combination of high strength and high wear resistance properties A lot of research work has been carried out on aluminum based composite materials reinforced with silica Surappa 8 at varying volume fractions for altering mechanical physical thermal and tribological properties 

The significant benefits in the form of performance and economics triggered research in the area of AMCs Stein et al 9 Yang et al 10 Sahoo et al 11 Researchers are focusing on many influencing parameters to obtain the desired properties by altering the processing routes reinforcement types volume fractions alloying heat treatment method etc Newer processing routes are emerging in the field of composite processing which include microwave processing Singh et al 12 diffusion bonding stir casting infiltration in situ reactive process and spray deposition and consolidation Singh et al 13 however stir casting processes are the oldest and most cost effective method for producing MMCs of metals with lower melting temperature such as aluminum and magnésium Hashim et al 14 Ezatpour et al 15 The experimental work of Niranjan and Lakshminarayanan 16 was based on investigations of the dry sliding behavior of aluminum based composites reinforced with titanium boride The authors concluded that the wear properties were significantly improved due to the uniform dispersion of reinforcement and strong particle matrix bonding which were characterized by relevant techniques such as scanning electron microscopy SEM and X ray diffraction 

The work carried out by Yigezu et al 17 investigated the effect of sliding distance applied load and weight percentage of reinforcement on the abrasive wear properties of aluminum composites In situ synthesis of aluminum based composites reinforced with Si and TiC particles was carried out and characterized by a pin on disc apparatus for wear testing and SEM for microstructure analysis Results revealed that the mechanical properties were improved by increasing the reinforcement weight percentage and at particular applied load the wear loss and coefficient of friction were reduced Dry sliding wear properties of hybrid aluminium metal matrix composites HAMC reinforced with graphite silicon carbide and alumina particles were extensively studied by Ravindran et al 18 19 Rajkumar and Aravindan 20 Suresha and Sridhara 21 Kumar and Dhiman 22 and Koksal et al 23 and favorable results were reported with reinforcement additions However it was reported that graphite should be added in lower percentages and other reinforcements were also recommended with lower volume fractions usually less than 10 because with increasing weight percentage of reinforcements agglomeration occurs as reported by Singh et al 24 This clustering can seriously affect the properties of materials by reducing overall strength in other parts of the composite The weakening effect of higher graphite content 8 was reported by Gibson et al 25 and it was reported that higher contents can cause significant yielding of the composite with increased wear rate However appropriate levels of graphite can help in the formation of conductive tribolayers which can reduce the wear rate significantly due to their lubricating properties Rajkumar and Aravindan 20 Singh et al 24

The properties of MMCs depend on many factors such as uniform distribution of reinforcements particle size interfacial bonding and wettability of reinforcements and interaction of hybrid particles It was reported Singh et al 24 that the addition of graphite in alumina particles provides the support of lubrication whereas alumina contributes to the overall hardness which provides a positive interaction for wear resistance applications In the present work to obtain a better interaction between the reinforced particles their contributions at varying weight percentages were studied before sliding wear tests were performed To the best of the authors knowledge much less work has been reported on the dry sliding behavior of HAMCs containing alumina carbon nanotube and boron carbide using the Taguchi methodology The high cost of boron carbide and lower wettability of B4C particles at lower temperatures Krishna et al 26 restricted its use in research on HAMCs From the literature survey it can be seen that there are limited research work on dry sliding wear parameter optimization while machining AA6061 B4C CNT This article focuses on optimization of process parameters on machining of hybrid AA6061 MMCs on various compositions of B4C and CNT by DOE method The input and output parameters were explored using Taguchi s DOE and regression equations The results and calculated values were based on plan of the experiment and the results analyzed using MINITAB software

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