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Modelling precipitation hardening with Kampmann-Wagner approach for age hardened aluminium alloys

By Jan Herrnring (Helmholtz Zentrum Geesthacht)
Co-authors: Benjamin Klusemann (2Leuphana University of L√ľneburg, 1Helmholtz-Zentrum Geesthacht)

Since the discovery of precipitation hardening in aluminium alloys at the beginning one of the 20th century aluminium alloys have become one of the most important materials for lightweight structures. The excellent mechanical properties of precipitation hardened aluminium alloys are based on a size distribution of nano-scaled metastable precipitations. Once these distribution is known, it is possible to determine yield strength and work hardening of the alloy. Such simulation tools are essential in research and industry for process development. This work uses a generalized modelling approach of the numerical Kampmann-Wagner-Model for non-isothermal second phase precipitation. Core element of this modelling approach are a nucleation law, which is based on classic nucleation theory. Further the development of already nucleated precipitations is described by a transient partial differential equation, which determines the velocity of growth or dissolution of the precipitates. This modelling strategy has been implemented and coupled with the open source code OpenCalphad for utilizing the possibilities of the CALPHAD approach. Selected examples of this model of an 6xxx aluminium alloy for different heat treatments, in particular for laser welding, are presented showing the capabilities of this modelling approach.

Ⓒ Photos:Toerisme Leuven