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

钛基合金因其高强度（~1000 MPa）和良好的耐腐蚀性而具有很大的商业应用潜力。利用简单铸造技术制备大块纳米/超细组织钛基共晶合金的报道很少。在这个项目中，将获得定量和系统的理解，以评估冷却速度对共晶模型系统（即Ti-Fe）初始阶段微观结构形成的影响。特别是，冷却速率（10-106K/s）对局部晶格应变的影响，以及后者在微观结构演变的初始阶段对动力学的后续影响，以及几个亚稳相的出现，以及对相稳定性的影响，都将得到澄清。为了实现这一目标，计划采用联合方法，将德累斯顿IFW小组的实验与德国工业大学小组的相场模拟和德国<s:1>塞尔多夫MPIE小组的从头计算系统地结合起来。在随后的步骤中，计划对包含和不包含亚稳相的不同加工路线对初始生长动力学的影响进行系统研究。

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.