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

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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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