Aluminium alloy fabrication; physical models

Aluminium alloy fabrication; physical models for process simulation

 

By:

Alexis Miroux

Materials innovation institute

Delft University of Technology

The Netherlands

 

There is a growing interest from the metal industry in using models with stronger physical basis to both better understand and control the fabrication process and to design products with improved properties. The fabrication chain usually contains several thermo-mechanical steps and the materials properties evolve along the chain due to the action of successive or concurrent physical phenomena, as for instance plastic deformation, recrystallization, or phase transformation. Understanding the underlying physical mechanisms of these transformations is also a pre-requisite for the elaboration of reliable models.

The Materials Science and Engineering department at the Delft University of Technology has long been developing such modelling approaches for metallic materials. The presentation gives several examples of physically based material models for the aluminium alloy production. The first one illustrates the coupling of a dislocation based model and a crystal plasticity model with a finite element model to simulate warm forming of AA6xxx sheets. In the second example mesoscale precipitation models simulating the metastable phase evolution during ageing of AA6xxx and AA7xxx are presented. The last one shows a detailed investigation of the grain boundary motion during recrystallization and the influence of the second phases resulting from the thermo-mechanical history during AA3xxx sheet rolling.