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

Ti-Fe 共晶体系中初始微观结构形成的弹性贡献的尺度桥接研究

• 批准号: 76817956
• 负责人: Professor Dr.-Ing. Jürgen Eckert
• 金额: --
• 依托单位: Max-Planck-Institut für Eisenforschung GmbH (MPIE)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/76817956?language=en
• 关键词: Scale; bridging; studies; elastic; contributions

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.

钛基合金因其高强度（~1000 MPa）和良好的耐腐蚀性而被建议用于商业应用，具有巨大的潜力。关于通过简单铸造技术生产块状纳米/超细结构钛基共晶合金的报道很少。在该项目中，将获得定量和系统的理解，以评估冷却速率对共晶模型系统（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，以及后者对微观结构演化初始阶段动力学的影响，以及几个亚稳态相的出现以及对相稳定性的影响，应予以澄清。为了实现这一目标，我们打算采用联合方法，将 IFW 德累斯顿小组的实验与 RWTH 小组的相场模拟以及 MPIE 杜塞尔多夫小组的从头算进行系统地结合起来。在后续步骤中，计划系统研究包含和不包含亚稳态相的不同加工路线对初始生长动力学的影响。

项目成果

First-principles study of the thermodynamic and elastic properties of eutectic Fe–Ti alloy

• DOI: 10.1016/j.actamat.2011.11.046
• 发表时间: 2012-02
• 期刊: Acta Materialia
• 影响因子: 9.4
• 作者: Li-Fang Zhu;M. Friák;A. Dick;B. Grabowski;T. Hickel;F. Liot;D. Holec;A. Schlieter;U. Kühn;J. Eckert;Z. Ebrahimi;H. Emmerich;J. Neugebauer