Author(s)

W. van Till, C. Vuik, S. van der Zwaag

Abstract

Moving boundaries in solid state aluminium alloys W. van Till', C. Vuik^, S. van der Zwaag* ^ Department for Materials Science and Technology, ^Department of Applied Mathematical Analysis, Delft University of Technology, The Netherlands Abstract As-cast commercial aluminium extrusion alloys contain dissolvable precipitates and stable intermetallic particles that make the material unsuitable for further mechanical processing. These inhomogeneities can be removed with a thermal treatment, during which precipitates dissolve and needle-shaped iron based (3- particles transform into more spherical and benign a-particles. The dissolution of precipitates can be described as a moving boundary prob- lem. The moving grid and the phase field method are suitable numerical methods to solve this problem. The moving grid method has been used successfully to model the dissolution of the precipitates. However, it is difficult to capture com- plex shapes of the moving boundary, since th

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