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A stochastic microstructure model for particle reinforced aluminium matrix composites

: Losch, Katharina; Schuff, S.; Balle, Frank; Beck, T.; Redenbach, C.


Journal of microscopy 273 (2019), Nr.2, S.115-126
ISSN: 0022-2720
ISSN: 1365-2818
Deutsche Forschungsgemeinschaft DFG
GRK 1932
Fraunhofer ITWM ()
Fraunhofer EMI ()
aluminum matrix composite; metal matrix composite; microstructural model; silicon carbide particles; volume images

Metal matrix composites are complex materials consisting of various phases which can display largely different mechanical properties. The deformation behaviour of these composites cannot be sufficiently modelled by averages or simple particle shapes due to the local stresses that occur on the particle edges. Therefore, a sophisticated model of the microstructure is needed. We introduce a method for stochastic modelling of a silicon carbide (SiC) particle reinforced aluminium matrix composite. The SiC particles are modelled by Laguerre polyhedra generated by densely packed spheres. The shape factors of the polyhedra have been fitted to the particle shapes observed in three‐dimensional images. Particle elongation in extrusion direction and the observed log‐normal volume distribution of the particles are included in the model by suitable scaling. An outlook is presented on how to model the grains of the polycrystalline aluminium matrix and intermetallic precipitates, which result from the strengthening mechanism of the matrix.