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Coupled precipitation and yield strength modelling for non-isothermal treatments of a 6061 aluminium alloy

2013; Elsevier BV; Volume: 62; Linguagem: Inglês

10.1016/j.actamat.2013.09.041

1873-2453

Didier Bardel, Michel Perez, Daniel Nélias, A. Deschamps, Christopher Hutchinson, Daniel Maisonnette, Thibaut Chaise, J. Garnier, Florent Bourlier,

Aluminum Alloys Composites Properties

In age-hardening alloys, high-temperature processes, such as welding, can strongly modify the precipitation state, and thus degrade the associated mechanical properties. The aim of this paper is to present a coupled approach able to describe precipitation and associated yield stresses for non-isothermal treatments of a 6061 aluminium alloy. The precipitation state (in terms of volume fraction and precipitate size distribution) is modelled thanks to a recent implementation of the classical nucleation and growth theories for needle-shaped precipitates. The precipitation model is validated through small-angle neutron scattering and transmission electron microscopy experiments. The precipitation size distribution is then used as an entry parameter of a micromechanical model for the yield strength of the alloy. Predicted yield stresses are compared to tensile tests performed with various heating conditions, representative of the heat-affected zone of a welded joint.