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

钛基合金由于其高强度（~1000 MPa）和良好的耐腐蚀性而具有巨大的商业应用潜力。采用简单的铸造工艺制备块体纳米/超细结构钛基共晶合金的报道很少。在这个项目中，将获得一个定量和系统的理解，在评估冷却速度对组织形成的影响在共晶模型系统，即Ti-Fe的初始阶段。特别是，冷却速率（10- 106 K/s）对局部晶格应变的影响，以及随后在微观结构演变的初始阶段，后者对动力学的影响，以及几个亚稳相的出现，以及对相的稳定性，应予以澄清。为了实现这一目标的联合方法，在IFW德累斯顿组中的实验系统地结合在RWTH组中的相场模拟，并与MPIE杜塞尔多夫组的从头计算相结合。在随后的步骤中，计划对不同加工路线的影响进行系统研究，包括和不包括亚稳相对初始生长动力学的影响。

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.