Graphene effect on mechanical response of metal substrate
(2019) Euromat 2019, European Congress and Exhibition on Advanced Materials and Processes — Location: Stockholm, Sweden (1.September.2019)
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- Introduction/Purpose This work investigates the effect of a single layer graphene on the development of the contact plasticity inside a copper underlying substrate. Methods A copper film deposited on a Si wafer has been used as the substrate in the chemical vapor deposition process for graphene production. Hence, there is no need for transferring graphene which avoids many possible artifacts. Nanoindentation was performed on the Cu-film with and without graphene. In order to understand the root causes of these effects of the presence of graphene on the plastic flow, transmission electron microscopy is used to compare samples after nanoindentation in terms of dislocation structures. 3D discrete dislocation dynamics simulations are also performed to analyze the long-range back stress that are generated by the dislocation arrangements. To further extend this research and investigate the known effect of hardening by graphene insertion into metals, another system has been addressed which involves the deposition of a Cu film on top of the graphene layer, lying itself on top of the annealed Cu substrate (Copper-Graphene-Copper). Results The analysis of the force-displacement curves indicates that the presence of graphene modifies the onset of plasticity which appears in the form of a pop-in. The first pop-in occurs at lower loads and the pop-in lengths are smaller with graphene in comparison to the Cu film without graphene. The magnitude of the effect of the presence of a graphene cap layer varies also with respect to the orientation of the indented Cu grain. In addition, the presence of graphene caused marked effect on the indentation response in the second configuration, even larger than the first configuration. Conclusions Graphene shows a profound effect on the indentation response of copper film in the both case when graphene lying on the top of copper film also placing between two copper film.
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Bahrami, F., Fivel, M., Wasil Malik, M., Huet, B., Hammad, M., Idrissi, H., Raskin, J.-P., & Pardoen, T. (2019). Graphene effect on mechanical response of metal substrate. Abstract Book - EUROMAT 2019, p. 1370. https://hdl.handle.net/2078.5/228283