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