Neutron Through-Thickness Stress Measurements in Two-Phase Coatings with High Spatial Resolution

Neutron Through-Thickness Stress Measurements in Two-Phase Coatings with High Spatial Resolution

V. Luzin, D. Fraser

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Neutron diffraction residual stress profiling of sprayed coatings with high spatial resolution is a difficult task. Normally, only for single-phase materials 0.1 – 0.2 mm resolution can be achieved. Stress measurements in two-phase or multi-phase coatings are an even more formidable experimental task due to the necessity of measuring all phases with lower than 100% volume fractions and the necessity to resolve the d0 problem in a more complex way than the for single-phase coating systems. The results of through-thickness residual stress profiling neutron diffraction experiments are reported on a selected two-phase, metal-metal composite coating, deposited by the cold spray technique. With both phase strains measured and complemented by additional information provided by other characterisations, the full stress state was reconstructed. Macro- and micro-stresses were separated allowing interpretation of the experimental data in terms of macro- and micro-mechanics. It also allowed us to make conclusions about the thermal mechanisms of macro- and micro-stress formation, as well as connection of these mechanisms to spraying parameters.

Residual Stress, Coatings, Cold Spray

Published online 4/20/2018, 6 pages
Copyright © 2018 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: V. Luzin, D. Fraser, ‘Neutron Through-Thickness Stress Measurements in Two-Phase Coatings with High Spatial Resolution’, Materials Research Proceedings, Vol. 4, pp 111-116, 2018


The article was published as article 17 of the book

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[1] V. Luzin, J. Matejicek and G.-H. T., Through-thickness Residual Stress Measurement by Neutron Diffraction in Cu+W Plasma Spray Coatings, Mater. Sci. Forum, 652 (2010) 50-56.
[2] K.-D. Liss, B. Hunter, M. Hagen, T. Noakes and S. Kennedy, Echidna – the new high-resolution powder diffractometer being built at OPAL, Physica B: Condensed Matter, 385–386, Part 2 (2006) 1010-1012.
[3] A.C. Larson and R.B. Von Dreele, in: Report LAUR 86-748, Los Alamos National Laboratory, 2004.
[4] B. Toby, EXPGUI, a graphical user interface for GSAS, J. Appl. Crystallogr., 34 (2001) 210-213.
[5] O. Kirstein, V. Luzin and U. Garbe, The Strain-Scanning Diffractometer Kowari, Neutron News, 20 (2009) 34-36.
[6] Y.C. Tsui and T.W. Clyne, An analytical model for predicting residual stresses in progressively deposited coatings .1. Planar geometry, Thin Solid Films, 306 (1997) 23-33.
[7] Z. Hashin, The Elastic Moduli of Heterogeneous Materials, Journal of Applied Mechanics, 29 (1962) 143-150.
[8] V. Luzin, K. Spencer, M. Zhang, N. Matthews, J. Davis and M. Saleh, Residual Stresses in Cold Spray Coatings, in: P. Cavaliere (Ed.) Cold-Spray Coatings – Recent Trends and Future Perspectives, Springer, 2018.