A study on characterization of Al-18%Si alloy by centrifuge casting

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IDL - International Digital Library Of Technology & Research Volume 1, Issue 3, Apr 2017

Available at: www.dbpublications.org

International e-Journal For Technology And Research-2017

A study on characterization of Al-18%Si alloy by centrifuge casting Manjunath M D 1, Mallikarjun P S2, Shankar Narayan K3, Rajiv B L4, Harish N5 1234

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Department of Mechanical Engineering, NMIT Yelahanka, Bangalore, Karnataka, India Assistant Professor, Department of Mechanical Engineering, NMIT yelahanka, Bangalore Karnataka, India

Abstract: Aluminum-silicon alloy are characterized by light weight, good strength –to-weight ratio, ease of fabrication of at reasonable cost, high strength at elevated temperature, good thermal conductivity, excellent castability, good weldability, excellent corrosion and wear resistance property. Thus, these types of alloys are well suited for automotive industries, aerospace structural and military applications. In centrifuge casting solidification rate is faster compared to gravity casting, but still solidification depends on various process parameters like, cooling temperature of molten metal, rotational speed of the die and also wall thickness of die. In centrifuge casting the silicon deposition in aluminum varies from top to bottom. Here Al-Si functionally graded material is used and developed under centrifuge casting. The method used in this work to produce functionally graded material is totally different from other centrifugal casting which helped in producing solid cylindrical parts. This report describes about mechanical characterization of Al18%Si at different temperature. At 950°C casting shows good ultimate tensile strength and harder metal compared to other casting. Keywords: centrifuge casting, mechanical properties, functionally graded material(FGM), AlSi18% centrifuge casting.

1.INTRODUCTION Functionally Graded Material are a new class of inhomogeneous material, whose composition and

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microstructure vary from one end to the other in component. In conventional composites, the constituent phases are evenly distributed thereby the properties on an average will be uniform. However in FGMs, the composition and microstructure vary smoothly in space and the properties and performance therefore vary from one end of the specimen to other end. The FGMs, can be tailored to the specific service requirement thus ensuring the best response of the system. Due to the gradual variation of composition and microstructure, it avoids an abrupt interface which gives smooth transition from one side to the other side avoiding the local stress concentration [1]. This work uses a modified centrifugal casting technique to produce in situ blocky Al/Si FGMs. The process enables the pouring of molten metal in to stationary mould. The principal advantage of this is good mould filling combined with microstructure control, which usually results in improved mechanical properties. Apart from this production rate, time saving, and any kind of casting can be reproducible of any shape.

2.OBJECTIVES As from the literature review promoted for the need of a systematic study of various mechanical properties of Aluminum Silicon alloy can be used for better application and have better composition. This study can lead one to explore the possibility of identify the use of these alloy for engineering applications. Therefore the work taken up have following objectives: 1. Fabrication of Al-Si by centrifuge casting.

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