EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

Nanofluids are solid-liquid mixtures composed of solid nanofibers or nanoparticles with size in the range of 1 to 100 nm that are suspended in a fluid. Their applications span in cooling of engines and electronics, heat exchange in solar collectors, heat storage systems and as coolants in manufacturing. The use of nanofluids has been proved in some cases to offer a positive effect on the corrosion resistance. Aluminum is a light material with remarkable fatigue resistance under various environmental conditions such as air, water, and sea, as well as under exposure to different chemicals.
The aim of this study was to evaluate the fatigue performance of a cold-rolled AA 7075-T6 plate in a Cu nanofluid and other corrosion environments, under the aspect of the forming direction. A three-point bending fatigue device was specially designed and manufactured, with the tests performed at a frequency of 20 Hz, R=1, in ambient temperature. Fatigue Wohler-like curves were designed for tests performed along the long transverse (T), short-transverse (S) and rolling (L) directions of the plate. The stress corresponding to 106 cycles was considered as the fatigue life limit (endurance limit). The results were interpreted against the forming direction and revealed significant differences in fatigue and corrosion-fatigue life. The nanofluid impact on aluminum fatigue life was evaluated as a parameter with high potential that is worth further investigation.
Acknowledgement: A portion of this research has been co-financed by the European Union and Greek national funds through the Operational Program Competitiveness, Entrepreneurship and Innovation, under the call RESEARCH – CREATE – INNOVATE (project code: Τ1ΕDΚ-04359).