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Experimental study of room-temperature indentation viscoplastic ‘creep’ in zirconium

Storer, S. C.; Fitzpatrick, M. E.; Hainsworth, S. V. and Rist, M. A. (2016). Experimental study of room-temperature indentation viscoplastic ‘creep’ in zirconium. Philosophical Magazine. Part A: Materials Science, 96(24) pp. 2547–2563.

DOI (Digital Object Identifier) Link: https://doi.org/10.1080/14786435.2016.1209310
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Abstract

In this paper we have studied the mechanisms of so-called ‘indentation creep’ in a zirconium alloy. Nanoindentation was used to obtain strain rate data as the sample was indented at room temperature, at a homologous temperature below that for which creep behaviour would be expected for this material. A high value of strain rate was obtained, consistent with previous work on indentation creep. In order to elucidate the mechanism of time-dependent deformation, a load relaxation experiment was performed by uniaxial loading of a sample of the same alloy. By allowing relaxation of the sample from a peak load in the tensile test machine, a similar stress exponent was obtained to that seen in the nanoindentation creep test. We conclude that for metals, at temperatures below that at which conventional creep will occur, nanoindentation ‘creep’ proceeds through deformation on active slip systems that were initiated by prior loading beyond the plastic limit. It is therefore more appropriate to describe it as a viscoplastic process, and not as creep deformation.

Item Type: Journal Item
Copyright Holders: 2016 Informa UK Limited
ISSN: 1478-6435
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Related URLs:
Item ID: 48432
Depositing User: Susan Storer
Date Deposited: 06 Feb 2017 10:40
Last Modified: 02 Nov 2017 15:06
URI: http://oro.open.ac.uk/id/eprint/48432
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