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Open AccessArticle

Nano-Scale Residual Stress Profiling in Thin Multilayer Films with Non-Equibiaxial Stress State

1
Engineering Department, Università degli studi Roma Tre, via della Vasca Navale 79, 00146 Rome, Italy
2
School of Engineering & Innovation, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
3
Saint-Gobain Research Paris, 39 Quai Lucien Lefranc, 93303 Aubervilliers Cedex, France
4
Polytechnic Department of Engineering and Architecture (DPIA), University of Udine, Via delle Scienze 208, 33100 Udine, Italy
5
Multi-Beam Laboratory for Engineering Microscopy (MBLEM), Department of Engineering Science, Parks Road, Oxford OX1 3PJ, UK
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(5), 853; https://doi.org/10.3390/nano10050853
Received: 21 March 2020 / Revised: 23 April 2020 / Accepted: 24 April 2020 / Published: 28 April 2020
(This article belongs to the Special Issue Characterization of Nanomaterials)
Silver-based low-emissivity (low-E) coatings are applied on architectural glazing to cost-effectively reduce heat losses, as they generally consist of dielectric/Ag/dielectric multilayer stacks, where the thin Ag layer reflects long- wavelength infrared (IR), while the dielectric layers both protect the Ag and act as an anti-reflective barrier. The architecture of the multilayer stack influences its mechanical properties and it is strongly dependent on the residual stress distribution in the stack. Residual stress evaluation by combining focused ion beam (FIB) milling and digital image correlation (DIC), using the micro-ring core configuration (FIB-DIC), offers micron-scale lateral resolution and provides information about the residual stress variation with depth, i.e., it allows depth profiling for both equibiaxial and non-equibiaxial stress distributions and hence can be effectively used to characterize low-E coatings. In this work, we propose an innovative approach to improve the depth resolution and surface sensitivity for residual stress depth profiling in the case of ultra-thin as-deposited and post-deposition annealed Si3N4/Ag/ZnO low-E coatings, by considering different fractions of area for DIC strain analysis and accordingly developing a unique influence function to maintain the sensitivity of the technique at is maximum during the calculation. Residual stress measurements performed using this novel FIB-DIC approach revealed that the individual Si3N4/ZnO layers in the multilayer stack are under different amounts of compressive stresses. The magnitude and orientation of these stresses changes significantly after heat treatment and provides a clear explanation for the observed differences in terms of scratch critical load. The results show that the proposed FIB-DIC combined-areas approach is a unique method for accurately probing non-equibiaxial residual stresses with nano-scale resolution in thin films, including multilayers. View Full-Text
Keywords: FIB-DIC; ring-core; low emissivity coatings; residual stress; profiling; non-equibiaxial stress; adhesion FIB-DIC; ring-core; low emissivity coatings; residual stress; profiling; non-equibiaxial stress; adhesion
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MDPI and ACS Style

Sebastiani, M.; Rossi, E.; Zeeshan Mughal, M.; Benedetto, A.; Jacquet, P.; Salvati, E.; Korsunsky, A.M. Nano-Scale Residual Stress Profiling in Thin Multilayer Films with Non-Equibiaxial Stress State. Nanomaterials 2020, 10, 853.

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