Refine
Year of publication
Document Type
- Article (70)
- Book (28)
- Part of a Book (19)
- Bachelor Thesis (14)
- Conference Proceeding (13)
- Doctoral Thesis (2)
- Report (2)
- Other (1)
- Working Paper (1)
Keywords
- Solarthermie (6)
- Energy (3)
- Autarkie (2)
- Container (2)
- Energie (2)
- Pflege (2)
- Simulation (2)
- Südafrika (2)
- Transition (2)
- Akademisierung der Gesundheitsfachberufe (1)
Institute
- Institut für Duale Studiengänge (150) (remove)
Semi-solid metal alloys, as used in thixoforming, have a special microstructure of globular grains suspended in a liquid metal matrix. The complex rheological properties are strongly influenced by the local solid fraction, particle shape, particle size and state of agglomeration. There is a high demand for models and software tools allowing the simulation of semi-solid casting processes. The material under investigation is a tin-lead alloy (Sn-15%Pb) which exhibits a similar microstructure to aluminium alloys. The experiments were performed with a concentric cylinder rheometer of the Searle type. Initially, the liquid alloy is cooled down to the semi-solid range under constant shearing and then kept under isothermal conditions for further experimentation. Based on the experimental data, a single-phase model has been derived where the semi-solid alloy is regarded as a homogeneous material with thixotropic properties and the microstructure is characterised by a structural parameter. The model consists of two parts: the equation of state, including a finite yield stress, and a rate equation for the structural parameter. The model equations are employed in numerical software and used for the simulation of characteristic filling cases and the comparison with the conventional filling.