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MM: Fachverband Metall- und Materialphysik

MM 34: Mechanical Properties and Alloy Design: e.g. Light-Weight, High-Temperature, Multicomponent Materials II

MM 34.5: Talk

Wednesday, March 20, 2024, 11:15–11:30, C 230

Experimental investigation on early precipitation reactions in Al-Cu alloys — •Johannes Berlin, Fabian Miller, and Ferdinand Haider — Chair for Experimental Physics I, University of Augsburg, Universitätsstraße 1, 86159 Augsburg (Germany)

Due to their excellent strength-to-weight ratio, heat-treatable Al-Cu alloys have been widely used since their invention. Although the hardening precipitates in these alloys are well-known, the early stages of formation and decomposition are still topic of ongoing research. Based on state-of-the-art scanning transmission electron microscopy, single Cu atoms can be imaged and natural ageing in form of Guinier*Preston zone formation accelerated by excess vacancies can be investigated. Scanning transmission electron microscopy is used to investigate the influence of different parameters, such as thermal history and the addition of trace elements, on early-stage precipitation in Al. In addition, resistivity, DSC and hardness measurements are performed to evaluate the temper state of the specimens. A better understanding of the mechanisms of precipitate formation and precipitate growth in these alloys could make it possible to further fine-tune material properties.

Keywords: Aluminium; Guinier-Preston Zones; TEM; Precipitates; vacancies