Berlin 2018 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 4: Topical session (Symposium EPS and MM): Mechanical Properties at Small Scales

MM 4.4: Vortrag

Montag, 12. März 2018, 11:15–11:30, TC 006

Electro-plastic deformation studies of Al-Cu eutectic alloys — •Doreen Andre, Stefanie Sandlöbes, and Sandra Korte-Kerzel — Institut für Metallkunde und Metallphysik, RWTH Aachen 52056 Aachen, GERMANY

A promising approach of forming materials with poor deformation behaviour, such as metallic-intermetallic composite materials, here an Al-Cu eutectic alloy, is to apply electric pulses during the forming processes. This effect is known as the electro-plastic effect (EPE). The EPE causes a drop in the yield strength resulting in higher formability of materials. However, the underlying physical mechanisms are not fully understood yet. Since the EPE has only been studied on the macroscopic scale until now, we have modified our nanoindenter device such that we can apply electrical pulses during nanoindentation and micro-pillar compression. This enables us to study the effects of electrical pulses during plastic deformation of single-phase and single-crystalline samples of even complex microstructures, hence, providing more detailed insights into the physical nature of the electro-plastic effect. Additionally, high current densities can be achieved due to the small tested sample volumes. Here, we present our experimental set-up and report about first experimental results of a nano-mechanical electro-plastic study on an Al-Cu eutectic alloy.