Evolution of stress fields during crack growth and arrest in a brittle-ductile CrN-Cr clamped-cantilever analysed by X-ray nanodiffraction and modelling

0553123 - FZÚ 2022 RIV GB eng J - Článek v odborném periodiku
Meindlhumer, M. - Brandt, L.R. - Zálešák, J. - Rosenthal, M. - Hruby, H. - Kopeček, Jaromír - Salvati, E. - Mitterer, C. - Daniel, R. - Todt, J. - Keckes, J. - Korsunsky, A.M.
Evolution of stress fields during crack growth and arrest in a brittle-ductile CrN-Cr clamped-cantilever analysed by X-ray nanodiffraction and modelling.
Materials and Design. Roč. 198, Jan. (2021), č. článku 109365. ISSN 0264-1275. E-ISSN 1873-4197
Institucionální podpora: RVO:68378271
Klíčová slova: cross-sectional X-ray nanodiffraction * micromechanics * CrN * Cr * multi-layer * eigenstrain modelling
Obor OECD: Materials engineering
Impakt faktor: 9.417, rok: 2021
Způsob publikování: Open access

In order to understand the fracture resistance of nanocrystalline thin films, it is necessary to assess nanoscopic multiaxial stress fields accompanying crack growth during irreversible deformation. Here, a clamped cantilever with dimensions of 200 × 23.7 × 40 μm3 was machined by focused ion beam milling from a thin film composed of four alternating CrN and Cr layers. The cantilever was loaded to 460 mN in two steps and multiaxial strain distributions were determined by in situ cross-sectional X-ray nanodiffraction. Characterization in as-deposited state revealed the depth variation of fibre texture and residual stress across the layers. The in situ experiment indicated a strong influence of the residual stresses on the cross-sectional stress fields evolution and crack arrest capability at the CrN-Cr interface.
Trvalý link: http://hdl.handle.net/11104/0328136