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Strain-induced phase transformation of a thin Co film on flexible substrates

Autor(en)
V. M. Marx, C. Kirchlechner, B. Breitbach, M. J. Cordill, D. M. Toebbens, T. Waitz, G. Dehm
Abstrakt

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(en)
Physik Nanostrukturierter Materialien
Externe Organisation(en)
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
Band
121
Seiten
227-233
Anzahl der Seiten
7
ISSN
1359-6454
DOI
https://doi.org/10.1016/j.actamat.2016.09.015
Publikationsdatum
12-2016
Peer-reviewed
Ja
ÖFOS 2012
103018 Materialphysik
Schlagwörter
ASJC Scopus Sachgebiete
Electronic, Optical and Magnetic Materials, Ceramics and Composites, Metals and Alloys, Polymers and Plastics
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/cf0543a3-51b1-4baf-bb4d-406c6ea9992c