iosr-JMCE   Volume-7 ~ Issue-4

Abstract: Metal matrix nanocomposites (MMNCs) with the addition of nano-sized ceramic particles can be of significance for automobile, aerospace and numerous other applications. The physical and mechanical characteristics of the light refractory carbides such as SiC, TiC and B4C make them suitable for being used as reinforcement in aluminium base metal matrix composites This paper presents a technique for an inexpensive fabrication of bulk lightweight MMNCs with reproducible microstructures and superior properties by use of ultrasonic nonlinear effects, namely transient cavitation and acoustic streaming; to achieve uniform dispersion of nano-sized B4C particles in molten aluminum alloy. Nano-sized B4Cp enhanced properties of aluminium matrix composites, with 1.5%wt of B4C. As compared to the base metal alloy, the mechanical properties including tensile strength and yield strength of the nanocomposites were improved significantly, while the ductility of base metal alloy matrix castings was retained. Micro structural study was carried out with an optical microscope and SEM which validates a good dispersion of nano-sized B4Cp in metal matrix. Mechanical properties of the as-cast MMNCs have been improved significantly even with a low weight fraction of nano-sized B4C.

Key Words: Metal matrix nano composites, Ultrasonic cavitaion, Boron carbide nanoparticles.

[[1]. G. Cao, H. Konishi, X. Li, "Mechanical properties and microstructure of SiC-reinforced Mg-(2,4)Al-1Si nanocomposites fabricated by ultrasonic cavitation based solidification processing". Materials Science and Engineering A 486 (2008) 357–362.
[2]. Jie Lan, Yong Yang, Xiaochun Li "Microstructure and microhardness of SiC nanoparticles reinforced magnesium composites fabricated by ultrasonic method" Materials Science and Engineering A 386 (2004) 284–290.
[3]. Yong Yang, Jie Lan, Xiaochun Li "Study on bulk aluminum matrix nano-composite fabricated by ultrasonic dispersion of nano-sized SiC particles in molten aluminum alloy" Materials Science and Engineering A 380 (2004) 378–383.
[4]. Guoping Cao, Hiromi Konishi, Xiaochun Li "Mechanical Properties and Microstructure of Mg/SiC Nanocomposites Fabricated by Ultrasonic Cavitation Based Nanomanufacturing" Journal of Manufacturing Science and Engineering JUNE 2008, Vol. 130.
[5]. G. Cao, H. Konishi and X. Li "Recent Developments on Ultrasonic Cavitation Based Solidification Processing of Bulk Magnesium Nanocomposites" International Journal of Metal casting/Winter 08, 57-68.
[6]. Yong Yang, Xiaochun Li, "Ultrasonic Cavitation Based Nanomanufacturing of Bulk Aluminum Matrix Nanocomposites. Journal of Manufacturing Science and Engineering" JUNE 2007, Vol. 129 / 497-501.
[7]. Xiaochun Li et al. "Fundamental Study of Bulk Magnesium Alloy Matrix Nanocomposites Fabricated by Ultrasonic Cavitation Based Solidification Processing" NSF Nanoscale Science and Engineering Grantees Conference, Dec 4-6, 2006.
[8]. S. M. Zebarjad, S. A. Sajjadi and E. Z. Vahid Karimi " Influence of Nanosized Silicon Carbide on Dimensional Stability of Al/SiC Nanocomposite" Research Letters in Materials Science Volume 2008, Article ID 835746, 4 pages.
[9]. A. Mazahery, H. Abdizadeh, H.R. Baharvandi "Development of high-performance A356 nano-Al2O3 composites" Materials Science and Engineering A 518 (2009) 61–64.
[10]. Vikram Singh and R.C. Prasad "Tensile and fracture behaviour of 6061 Al-SiCp metal matrix composites", International symposium of research students on materials science and engineering, December 20-22, 2004, Chennai, India.

Abstract: The Aluminium Industries Ltd was one of the leading switchgear manufacturers in India. It flourished in late 1960's. The company then faced severe financial stringency and doomed in 1985. This paper is based on an industrial training carried out at the company. The performance analysis and problem identification were carried out as part of the study and is summarised through this paper. The real problems at the company could be identified and suitable corrective measures could solve the problem and upheld the company in future.

Keywords - Capacity utilization, Cause and Effect relationship, Financial Performance, Sales performance SWOT analysis

Reports
[1] Annual Report of ALIND

Abstract: Manufacturing of dies has been presenting greater requirements of geometrical accuracy, dimensional precision and surface quality as well as decrease in costs and manufacturing times. Although proper cutting parameter values are utilized to obtain high geometrical accuracy and surface quality, there may exist geometrical discrepancy between the designed and the manufactured surface profile of the die cavities. In milling process; cutting speed, step over and feed are the main cutting parameters and these parameters affect geometrical accuracy and surface quality of the casting die cavities. In this paper, effects of the cutting parameters on geometrical error have been examined on a representative die cavity profile. To remove undesired volume in the die cavities, available cutting strategies are investigated. Finish option for roughing and finish option for finishing are optimized to reduce the Machining time of the cutting process thereby decreasing the cost of cutting process. The cutting parameters considered are Cut Feed, Step Depth, Spindle Speed for both roughing and finishing, scan type for roughing and lace type for finishing.3D model and manufacturing process is done in parametric modeling software Pro/Engineer wildfire5.0.

Keywords: Casting Dies, Milling Process ,, roughing & finishing of die cavity..

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[10]. Jenq Shyong By Chen, Yung Kuo Huang, Mao-Son Chen, "Feed rate optimization and tool profile modification for the high-efficiency ball end milling process", International Journal of Machine Tools &Manufacture..

Abstract: The main aim of the project is to analyze the thermal properties by varying geometry, material and thickness of cylinder fins. Parametric models of cylinder with fins have been developed to predict the transient thermal behavior. The models are created by varying the geometry, rectangular, circular and curved shaped fins and also by varying thickness of the fins. The 3D modeling software used is Pro/Engineer.The analysis is done using ANSYS. Presently Material used for manufacturing cylinder fin body is Aluminum Alloy 204 which has thermal conductivity of 110-150W/mk. We are analyzing the cylinder fins using this material and also using Aluminum alloy 6061 and Magnesium alloy which have higher thermal conductivities.

Keywords: Engine Cylinder Fins , Material , Fea Anlysis

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