Effect of alumina inclusions on microstructure and mechanical properties of 62 WC, 32 (Ti-W) C and 6 Co compacts

Albdiry, Mushtaq and Alethari, Haydar (2012) Effect of alumina inclusions on microstructure and mechanical properties of 62 WC, 32 (Ti-W) C and 6 Co compacts. International Journal of Microstructure and Materials Properties, 7 (4). pp. 329-340. ISSN 1741-8410

Abstract

This investigation is aimed at understanding the role of adding ceramic inclusion, alumina (Al2O3) on the densification, microstructure and mechanical properties of cemented carbide cutting inserts. The samples were
prepared of an initial mixture of 62 WC, 32 (Ti-W) C and 6 Co wt% particulates; different additions of Al2O3 of 1, 2, 3 and 4 wt% were introduced to that mixture. The testing specimens were compacted via powder metallurgy at 200 MPa and sintered at 1,410°C under vacuum. The green and sintered densities have decreased; the figures of macrohardness, Vickers hardness and transverse rupture strength have also deteriorated with the increase of alumina content. The macrohardness has almost declined of 30% at 3% alumina. This is ascribed to the interfacial grain-boundary decohesion between Al2O3 and carbide particles as can be observed from scanning electron microscopy images which depicts the monolithic clusters in the final consolidation of the compacts.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Copyright © 2012 Inderscience Enterprises Ltd. Permanent restricted access to published version due to publisher copyright policy.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 17 Mar 2013 07:20
Last Modified: 18 Aug 2014 05:07
Uncontrolled Keywords: powder metallurgy; cemented carbides; alumina; inclusion; microstructure and materials properties
Fields of Research : 09 Engineering > 0904 Chemical Engineering > 090406 Powder and Particle Technology
09 Engineering > 0912 Materials Engineering > 091207 Metals and Alloy Materials
09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Socio-Economic Objective: B Economic Development > 86 Manufacturing > 8610 Ceramics, Glass and Industrial Mineral Products > 861099 Ceramics, Glass and Industrial Mineral Products not elsewhere classified
Identification Number or DOI: 10.1504/IJMMP.2012.048523
URI: http://eprints.usq.edu.au/id/eprint/22098

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