Scale-bridging studies of the elastic contributions to initial microstructure formation in the eutectic system Ti-Fe

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Ti-based alloys have been suggested for commercial applications with a great potential due to their high strength (~1000 MPa) and good corrosion resistance. There are very few reports on bulk nano/ultrafine structured Ti-base eutectic alloys produced by simple casting techniques. In this project a quantitative and systematic understanding will be acquired on evaluating the effect of cooling rate on microstructure formation at the initial stages in a eutectic model system, i.e. Ti-Fe. In particular, the effects of the cooling rate (10-106K/s) on the local lattice strain - and the subsequent influence of the latter on the kinetics during the initial stages of microstructure evolution together with the appearance of several metastable phases as well as on the stability of the phases shall be clarified. To achieve this goal a joint approach, where experiments in the group at IFW Dresden are systematically combined with phase-field simulations in the group at RWTH and with ab initio calculations of the group at MPIE Düsseldorf are intended. In a subsequent step a systematic study of the influence of different processing routes with and without the inclusion of a metastable phase on the kinetics of initial growth is planned.