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Open AccessArticle

A Phenomenological Mechanical Material Model for Precipitation Hardening Aluminium Alloys

1
Chair of Materials Science, Faculty of Mechanical Engineering and Marine Technology, University of Rostock, 18059 Rostock, Germany
2
Competence Centre CALOR, Department Life, Light & Matter, Faculty of Interdisciplinary Research, University of Rostock, 18059 Rostock, Germany
*
Author to whom correspondence should be addressed.
Metals 2019, 9(11), 1165; https://doi.org/10.3390/met9111165
Received: 25 September 2019 / Revised: 14 October 2019 / Accepted: 21 October 2019 / Published: 29 October 2019
(This article belongs to the Special Issue Numerical Modelling and Simulation of Metal Processing)
Age hardening aluminium alloys obtain their strength by forming precipitates. This precipitation-hardened state is often the initial condition for short-term heat treatments, like welding processes or local laser heat treatment to produce tailored heat-treated profiles (THTP). During these heat treatments, the strength-increasing precipitates are dissolved depending on the maximum temperature and the material is softened in these areas. Depending on the temperature path, the mechanical properties differ between heating and cooling at the same temperature. To model this behavior, a phenomenological material model was developed based on the dissolution characteristics and experimental flow curves were developed depending on the current temperature and the maximum temperature. The dissolution characteristics were analyzed by calorimetry. The mechanical properties at different temperatures and peak temperatures were recorded by thermomechanical analysis. The usual phase transformation equations in the Finite Element Method (FEM) code, which were developed for phase transformation in steels, were used to develop a phenomenological model for the mechanical properties as a function of the relevant heat treatment parameters. This material model was implemented for aluminium alloy 6060 T4 in the finite element software LS-DYNA (Livermore Software Technology Corporation). View Full-Text
Keywords: aluminium alloy; EN AW-6060; precipitation hardening aluminium alloys; material model; heating; cooling; flow cures; LS-DYNA aluminium alloy; EN AW-6060; precipitation hardening aluminium alloys; material model; heating; cooling; flow cures; LS-DYNA
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MDPI and ACS Style

Fröck, H.; Kappis, L.V.; Reich, M.; Kessler, O. A Phenomenological Mechanical Material Model for Precipitation Hardening Aluminium Alloys. Metals 2019, 9, 1165.

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