Dresden 2014 – scientific programme

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DS: Fachverband Dünne Schichten

DS 9: Layer Properties: Electrical, Optical, and Mechanical Properties

DS 9.8: Talk

Tuesday, April 1, 2014, 12:00–12:15, CHE 91

Effect of temperature on the electrical and mechanical performance of Al-Li thin films deposited on viscoelastic substrates — •Alla S. Sologubenko, Diana Courty, and Ralph Spolenak — Laboratory for Nanometallurgy (LNM), ETH Zurich, Wolfgang-Pauli- Strasse 10, CH-8093 Zurich, Switzerland

Grain boundary cohesion and adhesion of the metallic thin film to a polyimide substrate are two factors crucially affecting the structural integrity of Al-Li alloys upon tensile loading. Al-Li thin film alloys of different compositions and microstructures were subjected to mechanical loading experiments accompanied by electrical resistance measurements in a tensile stage equipped with an in-situ heating module. The experiments performed at 100°C show drastic change in both, mechanical and electrical responses of the thin films of all compositions in comparison to room temperature measurements. This behavior evidences a large enhancement of adhesion in the thin film-substrate system due to the temperature increase. The exceptionally good performance of the equisize-grained Al-5 at.%Li alloy at both temperatures is attributed to an effect of the small intermetallic phase particles on the film plasticity and grain boundary cohesion.