Abstract
The Al-Si-Cu cast alloys are suitable for production of components for automotive and aerospace industries due to an excellent combination of mechanical properties; for such applications, the fracture behaviour of castings is important. A dimple type - trans-crystalline ductile fracture appears on the fracture surface of aluminium alloys, whose overall appearance shows both the matrix (α-phase) violation and the shape and size of the eutectic Si and the secondary - intermetallic phases. Nowadays, an increasing amount of aluminium is coming from the recycled products. The recycled aluminium cast alloys contain various additional elements (especially the higher amount of Fe), which are forming various secondary phases in microstructure. This paper describes dependence of the fracture surface character on the morphology and types of the secondary phases in the recycled A226 cast alloy with 0.9 % of Fe. The used experimental material was heat-treated and the fracture surface properties and morphology of the secondary phases in microstructure were analysed by a combination of different analytical techniques.
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