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A synchrotron X-ray diffraction deconvolution method for the measurement of residual stress in thermal barrier coatings as a function of depth
University of Manchester , School of Materials, Manchester M13 9PL, UK..
University of Manchester , School of Materials, Manchester M13 9PL, UK..
University of Manchester , School of Materials, Manchester M13 9PL, UK..
University of Manchester , School of Materials, Manchester M13 9PL, UK..
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2016 (English)In: Journal of applied crystallography, ISSN 0021-8898, E-ISSN 1600-5767, Vol. 49, no Pt 6, 1904-1911 p.Article in journal (Refereed) Published
Abstract [en]

The average residual stress distribution as a function of depth in an air plasma-sprayed yttria stabilized zirconia top coat used in thermal barrier coating (TBC) systems was measured using synchrotron radiation X-ray diffraction in reflection geometry on station I15 at Diamond Light Source, UK, employing a series of incidence angles. The stress values were calculated from data deconvoluted from diffraction patterns collected at increasing depths. The stress was found to be compressive through the thickness of the TBC and a fluctuation in the trend of the stress profile was indicated in some samples. Typically this fluctuation was observed to increase from the surface to the middle of the coating, decrease a little and then increase again towards the interface. The stress at the interface region was observed to be around 300 MPa, which agrees well with the reported values. The trend of the observed residual stress was found to be related to the crack distribution in the samples, in particular a large crack propagating from the middle of the coating. The method shows promise for the development of a nondestructive test for as-manufactured samples.

Place, publisher, year, edition, pages
2016. Vol. 49, no Pt 6, 1904-1911 p.
Keyword [en]
Flat plate powder diffraction, stress mapping, synchrotron glancing-angle X-ray diffraction, thermal barrier coatings
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology; ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-10338DOI: 10.1107/S1600576716013935ISI: 000391195900006PubMedID: 27980507Scopus ID: 2-s2.0-85003002949ISBN: 0021-8898 (Print) 0021-8898 OAI: oai:DiVA.org:hv-10338DiVA: diva2:1057757
Available from: 2016-12-19 Created: 2016-12-19 Last updated: 2017-04-20Bibliographically approved

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