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

V. M. Marx; C. Kirchlechner; B. Breitbach; M. J. Cordill; D. M. Toebbens; T. Waitz; G. Dehm

doi:10.1016/j.actamat.2016.09.015

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

V. M. Marx (Corresponding author)
, C. Kirchlechner
, B. Breitbach
, M. J. Cordill
, D. M. Toebbens
, T. Waitz
, G. Dehm

Physics of Nanostructured Materials

Publications: Contribution to journal › Article › Peer Reviewed

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.

Original language	English
Pages (from-to)	227-233
Number of pages	7
Journal	Acta Materialia
Volume	121
DOIs	https://doi.org/10.1016/j.actamat.2016.09.015
Publication status	Published - Dec 2016

Funding

Partial funding has been provided by the HZB (Berlin, Germany) under the project number 2014_2_14201169. B. Putz and O. Glushko (Erich Schmid Institute of Materials Science, Leoben) are acknowledged for the help during the synchrotron beamtime. The authors thank G. Richter, F. Thiele and R. Volker (MPI for Intelligent Systems, Stuttgart, Germany) for the fabrication of the Co film. Additionally, G. Bialkowski (MPIE, Dusseldorf, Germany) is acknowledged for annealing of the film and S. Zaefferer (MPIE, Dusseldorf, Germany) for support during EBSD measurements.

Austrian Fields of Science 2012

103018 Materials physics

Keywords

Phase transformation
Tensile test
X-ray diffraction
Thin films
MARTENSITIC-TRANSFORMATION
DEFORMATION-BEHAVIOR
MAGNETIC-PROPERTIES
IN-SITU
POLYCRYSTALLINE COBALT
NANOCRYSTALLINE COBALT
MECHANICAL-PROPERTIES
COPPER-FILMS
CU FILMS
ALLOY

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10.1016/j.actamat.2016.09.015

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title = "Strain-induced phase transformation of a thin Co film on flexible substrates",

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. ",

keywords = "Phase transformation, Tensile test, X-ray diffraction, Thin films, MARTENSITIC-TRANSFORMATION, DEFORMATION-BEHAVIOR, MAGNETIC-PROPERTIES, IN-SITU, POLYCRYSTALLINE COBALT, NANOCRYSTALLINE COBALT, MECHANICAL-PROPERTIES, COPPER-FILMS, CU FILMS, ALLOY",

author = "Marx, \{V. M.\} and C. Kirchlechner and B. Breitbach and Cordill, \{M. J.\} and Toebbens, \{D. M.\} and T. Waitz and G. Dehm",

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AU - Marx, V. M.

AU - Kirchlechner, C.

AU - Breitbach, B.

AU - Cordill, M. J.

AU - Toebbens, D. M.

AU - Waitz, T.

AU - Dehm, G.

PY - 2016/12

Y1 - 2016/12

N2 - 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.

AB - 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.

KW - Phase transformation

KW - Tensile test

KW - X-ray diffraction

KW - Thin films

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KW - DEFORMATION-BEHAVIOR

KW - MAGNETIC-PROPERTIES

KW - IN-SITU

KW - POLYCRYSTALLINE COBALT

KW - NANOCRYSTALLINE COBALT

KW - MECHANICAL-PROPERTIES

KW - COPPER-FILMS

KW - CU FILMS

KW - ALLOY

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U2 - 10.1016/j.actamat.2016.09.015

DO - 10.1016/j.actamat.2016.09.015

M3 - Article

SN - 1359-6454

VL - 121

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EP - 233

JO - Acta Materialia

JF - Acta Materialia

ER -

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

Abstract

Funding

Austrian Fields of Science 2012

Keywords

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