Strain-induced phase transformation of a thin Co film on flexible substrates
- Author(s)
- V. M. Marx, C. Kirchlechner, B. Breitbach, M. J. Cordill, D. M. Toebbens, T. Waitz, G. Dehm
- Abstract
The strain-induced FCC to HCP phase transformation of a two phase Co film on polyimide was investigated by performing a tensile test in an X-ray diffractometer. During straining of the 2 μm thick film, the intensity of the (002)
FCC peak continuously decreases at engineering strains between 2 and 8% and remains constant at higher strains. Complementary in situ tensile tests under an optical light microscope showed crack formation at 6.7% and crack saturation at around 10% engineering strain. The strain-induced phase transformation starts before the first cracks form leading to a maximum lattice strain of approximately 0.9% as initiation strain measured from the (101¯1)
HCP peak with the sin
2ψ method which converts to a film stress of approximately 1270 ± 150 MPa. It could be revealed that a strain-induced phase transformation can enhance the ductility and therefore delay the crack onset of a thin cobalt film.
- Organisation(s)
- Physics of Nanostructured Materials
- External organisation(s)
- Max-Planck-Institut für Eisenforschung, Max-Planck-Gesellschaft, Montanuniversität Leoben, Österreichische Akademie der Wissenschaften (ÖAW), Helmholtz-Zentrum Berlin für Materialien und Energie, Helmholtz-Zentrum Dresden-Rossendorf
- Journal
- Acta Materialia
- Volume
- 121
- Pages
- 227-233
- No. of pages
- 7
- ISSN
- 1359-6454
- DOI
- https://doi.org/10.1016/j.actamat.2016.09.015
- Publication date
- 12-2016
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103018 Materials physics
- Keywords
- ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials, Ceramics and Composites, Metals and Alloys, Polymers and Plastics
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/straininduced-phase-transformation-of-a-thin-co-film-on-flexible-substrates(cf0543a3-51b1-4baf-bb4d-406c6ea9992c).html