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A multiscale-indentation study of deformation and fracture in 6H polycrystalline silicon carbide

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journal contribution
posted on 09.04.2020, 09:23 by Dezhou Zhang, Liguo ZhaoLiguo Zhao, Anish RoyAnish Roy
The mechanical behaviour of a polycrystalline silicon carbide across length scales was studied using Vickers indentation, focusing on the hardness, fracture toughness and failure mechanism of the material. For macroscopic and microscopic indentations, the hardness decreased with an increase in load, which was associated with the well-known indentation size effect as well as the internal flaws. For nanoindentation, severe plastic deformation was discovered beneath the imprints on the basal plane (0001) which is the most favourable crystallographic plane for dislocation movement. Alternative sources of plastic deformation, including deformation twinning and stacking faults, were found for nanoindentations with an increased load. Also, cracking was observed for indents made at 100 mN and above, which was used to study the fracture toughness.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Materials Science and Technology

Volume

36

Issue

10

Pages

1111 - 1124

Publisher

Taylor & Francis

Version

AM (Accepted Manuscript)

Rights holder

© Institute of Materials, Minerals and Mining

Publisher statement

This is an Accepted Manuscript of an article published by Taylor & Francis in Materials Science and Technology on 24 April 2020, available online: http://www.tandfonline.com/10.1080/02670836.2020.1755139.

Acceptance date

08/04/2020

Publication date

2020-04-24

Copyright date

2020

ISSN

0267-0836

eISSN

1743-2847

Language

en

Depositor

Prof Liguo Zhao. Deposit date: 8 April 2020