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In-Situ Aluminothermal Reduction Synthesis of Ti3AlC2 Aluminium Composite by Friction Stir Processing

Madhu, H C and Kailas, V Satish (2016) In-Situ Aluminothermal Reduction Synthesis of Ti3AlC2 Aluminium Composite by Friction Stir Processing. In: 1st International Conference on Sustainable Materials Processing and Manufacturing (SMPM), JAN 23-25, 2017, Skukuza, SOUTH AFRICA, pp. 157-162.

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Official URL: http://dx.doi.org/10.1016/j.promfg.2016.12.041

Abstract

Max phase Ti(3)AlC(2)composite, which generally requires high energy ball milling and reactions at higher temperature, has been synthesized at lower temperatures by Friction Stir Processing (FSP). To enable this TiO2+C mixture is dispersed into aluminium matrix by FSP. FSP is a high strain rate plastic deformation process used for microstructural refinement in which a rotating nonconsumable tool mixes the work piece material while moving forward. Six overlapping passes of FSP were done to disperse stoichiometric TiO2+C mixture in to Aluminium matrix. Optical microscopy and scanning electron microscopy was done to confirm uniform distribution of particles. X-ray diffraction (XRD) was used for phase identification. XRD of as -processed sample showed peaks of Al, TiO2 and C indicating absence of reaction during FSP. Differential Scanning Calorimetric (DSC) analysis done on this processed sample showed exothermic peaks at 633 degrees C (below melting point of Al), 710 degrees C (above melting point) and 951 degrees C (above melting point). To evaluate the reactions at these temperatures, processed samples were heated to respective temperatures. For samples heated to 633 degrees C, Ti3AlC2, Al3Ti, TiC, Al phases has been observed along with unreacted TiO2 and C. For samples heated to 710 degrees C, peaks of Ti3AlC2, Al3Ti, Al and C were observed. For sample heated to 951 degrees C, only Ti3AlC2 and Al2O3 phases were observed besides Aluminium (Fig. 1). Interestingly, TiC impurity normally associated with Ti3AlC2 synthesis was absent for the sample heated to 951 degrees C. It is postulated that due to particle refinement during FSP, activation energy of the reaction is lowered. This lowering of activation energy also led to formation of Ti3AlC2 and TiC phases even for samples heated to 633 degrees C. Based on the results a reaction path has been proposed. (C) 2017 Published by Elsevier B.V.

Item Type: Conference Paper
Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE BV, SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 20 May 2017 05:18
Last Modified: 20 May 2017 05:18
URI: http://eprints.iisc.ac.in/id/eprint/56890

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