Berlin 2024 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 57: Phase Transformations III

MM 57.2: Vortrag

Donnerstag, 21. März 2024, 12:00–12:15, C 230

Resistometric determination of GP-zone formation and growth — •Fabian Miller, Johannes Berlin, and Ferdinand Haider — Universität Augsburg, Institut für Physik, 86135 Augsburg

Natural ageing in aluminium alloys is not yet fully understood, therefore the deeper analysis of their mechanical and electrical properties is important. These properties can be influenced by precipitate formation. Resistometry is a simple online method to monitor changes in the microstructure of a metallic alloy. In this work we focused on natural and artificial ageing of the Al-Cu system with samples containing 2 - 4 wt.% of Cu. Natural ageing depends on quenched in vacancies, so on the quenching conditions. Samples were homogenized at various temperatures and rapidly quenched to ambient temperature. Afterwards four point measurements were conducted during natural ageing. Due to formation of Guinier Preston zones, the resistivity first increases, then slowly decreases, allowing to monitor the unmixing for different temperatures and for different quenching conditions for samples with ternary trace alloying metals other than Cu. Also the sensitivity of the setup allowed to investigate the annihilation of vacancies quenched in from different high temperatures in pure Aluminium.

Keywords: Diffusion; Aluminium; Gunter Preston Zones; GP-Zones; Resistometry