Nano-Scale Residual Stress Profiling in Thin Multilayer Films with Non-Equibiaxial Stress State
| Autor: | Alessandro Benedetto, Paul Jacquet, Marco Sebastiani, Alexander M. Korsunsky, Muhammad Zeeshan Mughal, Edoardo Rossi, Enrico Salvati |
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| Přispěvatelé: | Sebastiani, M., Rossi, E., Mughal, M. Z., Benedetto, A., Jacquet, P., Salvati, E., Korsunsky, A. M. |
| Rok vydání: | 2020 |
| Předmět: |
Ring-core
Digital image correlation Materials science General Chemical Engineering Residual stre FIB-DIC residual stress 02 engineering and technology Dielectric 01 natural sciences Focused ion beam Article lcsh:Chemistry Adhesion Low emissivity coatings Non-equibiaxial stress Profiling Residual stress Stress (mechanics) ring-core Stack (abstract data type) 0103 physical sciences non-equibiaxial stress General Materials Science Thin film Composite material 010302 applied physics Low emissivity coating low emissivity coatings 021001 nanoscience & nanotechnology Non-equibiaxial stre adhesion Glazing lcsh:QD1-999 profiling 0210 nano-technology |
| Zdroj: | Nanomaterials Volume 10 Issue 5 Nanomaterials, Vol 10, Iss 853, p 853 (2020) |
| ISSN: | 2079-4991 |
| DOI: | 10.3390/nano10050853 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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