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Densification mechanisms during reactive spark plasma sintering of Titanium diboride and Zirconium diboride

Karthiselva, N S and Kashyap, Sanjay and Yadav, Devinder and Murty, B S and Bakshi, Srinivasa R (2017) Densification mechanisms during reactive spark plasma sintering of Titanium diboride and Zirconium diboride. In: PHILOSOPHICAL MAGAZINE, 97 (19, A). pp. 1588-1609.

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Official URL: http://dx.doi.org/10.1080/14786435.2017.1312022

Abstract

In this study, dense fine-grained ZrB2 and TiB2 were fabricated using reactive spark plasma sintering (RSPS) of ball-milled Zr/B and Ti/B mixtures. Systematic investigations were carried out to understand the mechanisms of reactive sintering. Two densification mechanisms were found to be operating during RSPS. The first stage of densification was due to self-propagating high temperature synthesis reaction leading to formation of ZrB2 and TiB2 compacts having relative density of similar to 48 and similar to 65%, respectively. The second stage of densification occurred at temperatures more than 1100 degrees C and resulted in final relative density of more than 98%. Electron backscatter diffraction and electron microscopy studies on interrupted RSPS samples as well as dense samples showed deformed grains and presence of slip steps while grain orientation spread map and pole figure analysis confirmed plastic flow. Plastic flow-aided pore closure is shown as major mechanism during reactive sintering.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the TAYLOR & FRANCIS LTD, 2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 10 Jun 2017 04:40
Last Modified: 10 Jun 2017 04:40
URI: http://eprints.iisc.ac.in/id/eprint/57185

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