Microstructural Influences Caused by Different Aging Strategies on the Strain-Dependent Damping of the High-Strength Aluminum Alloy AA7075

Metals, vol. 12, pp. 2172

Abstract

The present study focused on the influence of different aging conditions on the strain-dependent damping of the high-strength aluminum alloy AA7075. For this purpose, different artificial aging strategies were carried out after solution heat treatment with subsequent water quenching to identify correlations between microstructural evolution, hardness development, and individual material damping. The resulting material damping was measured using an experimental setup based on the principle of electromagnetic feedback. Scanning transmission electron microscopy (STEM) investigations were carried out using a scanning electron microscope (SEM) to characterize the material’s microstructure. Depending on the aging conditions, the damping investigations revealed specific characteristic behaviors in the strain-dependent range from 1 × 10−7 to 0.002. Peak aging conditions showed lower damping than the overaged conditions but resulted in the highest hardness. The hardness decreased with increasing aging time or temperature.

Authors 8

1. Steffen Lotz corresponding

   University of Kassel

   Affiliation as printed

   METAKUS Automotive GmbH, Fehrenberger Straße 1a, 34225 Baunatal, Germany

   Metal Forming Technology, University of Kassel, Kurt-Wolters-Straße 3, 34125 Kassel, Germany

2. Jiali Zhang Aachen Institute for Materials Applications in Mechanical Engineering

   RWTH Aachen University

   Affiliation as printed

   Institute for Materials Applications in Mechanical Engineering, RWTH Aachen, Augustinerbach 4, 52062 Aachen, Germany

3. Emad Scharifi

   University of Kassel

   Affiliation as printed

   Metal Forming Technology, University of Kassel, Kurt-Wolters-Straße 3, 34125 Kassel, Germany

4. Roland Morak
   Affiliation as printed

   Research and Development, AMAG Rolling GmbH, Postfach 32, 5282 Ranshofen, Austria

5. Ursula Weidig

   University of Kassel

   Affiliation as printed

   Metal Forming Technology, University of Kassel, Kurt-Wolters-Straße 3, 34125 Kassel, Germany

6. J. Göken

   University of Applied Sciences Emden Leer

   Affiliation as printed

   Faculty of Maritime Sciences, University of Applied Sciences Emden/Leer, Bergmannstraße 36, 26789 Leer, Germany

7. Christoph Broeckmann Aachen Institute for Materials Applications in Mechanical Engineering

   RWTH Aachen University

   Affiliation as printed

   Institute for Materials Applications in Mechanical Engineering, RWTH Aachen, Augustinerbach 4, 52062 Aachen, Germany

8. Kurt Steinhoff

   University of Kassel

   Affiliation as printed

   Metal Forming Technology, University of Kassel, Kurt-Wolters-Straße 3, 34125 Kassel, Germany