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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

DOI: 10.1107/S1600576716013935 DOI Help

Authors: C. Li (School of Materials, University of Manchester) , S. D. M. Jacques (School of Materials, University of Manchester) , Y. Chen (School of Materials, University of Manchester) , D. Daisenberger (Diamond Light Source) , P. Xiao (School of Materials, University of Manchester) , N. Markocsan (cProduction Technology Centre, University West, Trollha¨ttan, Sweden) , P. Nylen (cProduction Technology Centre, University West, Trollha¨ttan, Sweden) , R. J. Cernik (School of Materials, University of Manchester)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Applied Crystallography , VOL 49

State: Published (Approved)
Published: December 2016
Diamond Proposal Number(s): 12206

Open Access Open Access

Abstract: 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.

Journal Keywords: thermal barrier coatings; synchrotron glancing-angle X-ray diffraction; stress mapping; flat plate powder diffraction

Subject Areas: Materials


Instruments: I15-Extreme Conditions

Documents:
kc5041.pdf