Abstract
When a freestanding plastically deformable metal film is stretched, it ruptures by strain localization, and the elongation is less than a few percent. When the film is deposited on a polymer substrate, however, strain localization may be retarded by the substrate. This paper reports Cu films deposited on Kapton substrates and stretched up to the rupture of the substrates (at an elongation between 50% and 60%). When Cr adhesion layers are introduced between Cu and Kapton, few microcracks in Cu may be found, and the measured electrical resistance agrees with a theoretical prediction. Micrographs show that the strain localization and debonding coevolve.
Highlights
This paper focuses on the deformability of metal films on polymer substrates
For a metal film well bonded to a polymer substrate, finite element simulations have shown that the substrate can delocalize strain, so that the metal film can elongate indefinitely, only limited by the rupture of the polymer substrate
This paper demonstrates that metal films on polymer substrates can be stretched beyond a strain of 50%, and is limited by the rupture of the polymer substrate
Summary
When a freestanding film of a plastically deformable metal is subjected to a tensile load, the film ruptures by strain localization, by forming a neck within a narrow region, of a width comparable to the thickness of the film. For the first set of specimens, Cu films were deposited directly on Kapton substrates, with no Cr interlayers. This tensile experiment was terminated when the Kapton substrate ruptured at an elongation of
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