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Creep Deformation by Dislocation Movement in Waspaloy

Mark Whittaker Orcid Logo, Will Harrison Orcid Logo, Christopher Deen, Cathie Rae, Steve Williams

Materials, Volume: 10, Issue: 1, Start page: 61

Swansea University Authors: Mark Whittaker Orcid Logo, Will Harrison Orcid Logo

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DOI (Published version): 10.3390/ma10010061

Abstract

Creep tests of the polycrystalline nickel alloy Waspaloy have been conducted at Swansea University, for varying stress conditions at 700 ◦C. Investigation through use of Transmission Electron Microscopy at Cambridge University has examined the dislocation networks formed under these conditions, with...

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Published in: Materials
ISSN: 1996-1944
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa31621
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spelling 2020-07-16T14:08:46.5117661 v2 31621 2017-01-12 Creep Deformation by Dislocation Movement in Waspaloy a146c6d442cb2c466d096179f9ac97ca 0000-0002-5854-0726 Mark Whittaker Mark Whittaker true false dae59f76fa4f63123aa028abfcd2b07a 0000-0002-0380-7075 Will Harrison Will Harrison true false 2017-01-12 MTLS Creep tests of the polycrystalline nickel alloy Waspaloy have been conducted at Swansea University, for varying stress conditions at 700 ◦C. Investigation through use of Transmission Electron Microscopy at Cambridge University has examined the dislocation networks formed under these conditions, with particular attention paid to comparing tests performed above and below the yield stress. This paper highlights how the dislocation structures vary throughout creep and proposes a dislocation mechanism theory for creep in Waspaloy. Activation energies are calculated through approaches developed in the use of the recently formulated Wilshire Equations, and are found to differ above and below the yield stress. Low activation energies are found to be related to dislocation interaction with γ 0 precipitates below the yield stress. However, significantly increased dislocation densities at stresses above yield cause an increase in the activation energy values as forest hardening becomes the primary mechanism controlling dislocation movement. It is proposed that the activation energy change is related to the stress increment provided by work hardening, as can be observed from Ti, Ni and steel results. Journal Article Materials 10 1 61 1996-1944 12 1 2017 2017-01-12 10.3390/ma10010061 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2020-07-16T14:08:46.5117661 2017-01-12T11:06:02.9733738 College of Engineering Engineering Mark Whittaker 0000-0002-5854-0726 1 Will Harrison 0000-0002-0380-7075 2 Christopher Deen 3 Cathie Rae 4 Steve Williams 5 0031621-12012017110805.pdf whittaker2017.pdf 2017-01-12T11:08:05.3400000 Output 10600014 application/pdf Version of Record true 2017-01-12T00:00:00.0000000 This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited true https://creativecommons.org/licenses/by/4.0/
title Creep Deformation by Dislocation Movement in Waspaloy
spellingShingle Creep Deformation by Dislocation Movement in Waspaloy
Mark Whittaker
Will Harrison
title_short Creep Deformation by Dislocation Movement in Waspaloy
title_full Creep Deformation by Dislocation Movement in Waspaloy
title_fullStr Creep Deformation by Dislocation Movement in Waspaloy
title_full_unstemmed Creep Deformation by Dislocation Movement in Waspaloy
title_sort Creep Deformation by Dislocation Movement in Waspaloy
author_id_str_mv a146c6d442cb2c466d096179f9ac97ca
dae59f76fa4f63123aa028abfcd2b07a
author_id_fullname_str_mv a146c6d442cb2c466d096179f9ac97ca_***_Mark Whittaker
dae59f76fa4f63123aa028abfcd2b07a_***_Will Harrison
author Mark Whittaker
Will Harrison
author2 Mark Whittaker
Will Harrison
Christopher Deen
Cathie Rae
Steve Williams
format Journal article
container_title Materials
container_volume 10
container_issue 1
container_start_page 61
publishDate 2017
institution Swansea University
issn 1996-1944
doi_str_mv 10.3390/ma10010061
college_str College of Engineering
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hierarchy_top_title College of Engineering
hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
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description Creep tests of the polycrystalline nickel alloy Waspaloy have been conducted at Swansea University, for varying stress conditions at 700 ◦C. Investigation through use of Transmission Electron Microscopy at Cambridge University has examined the dislocation networks formed under these conditions, with particular attention paid to comparing tests performed above and below the yield stress. This paper highlights how the dislocation structures vary throughout creep and proposes a dislocation mechanism theory for creep in Waspaloy. Activation energies are calculated through approaches developed in the use of the recently formulated Wilshire Equations, and are found to differ above and below the yield stress. Low activation energies are found to be related to dislocation interaction with γ 0 precipitates below the yield stress. However, significantly increased dislocation densities at stresses above yield cause an increase in the activation energy values as forest hardening becomes the primary mechanism controlling dislocation movement. It is proposed that the activation energy change is related to the stress increment provided by work hardening, as can be observed from Ti, Ni and steel results.
published_date 2017-01-12T03:43:29Z
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