Characterization and optimizatin of mechanical properties of massively transformed Ti-46Al-9Nb sheet material

• Applicant: Professor Dr. Rüdiger Bormann, since 5/2006 (†)
• Subject Area: Metallurgical, Thermal and Thermomechanical Treatment of Materials
• Term: from 2006 to 2008
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 23835826

Mechanical properties of TiAl-based alloys are mainly determined by chemical composition and their micro structure as a result of thermomechanical processing. In the recently developed novel class of these materials with high Nb content, called TiAl alloys of 3r generation or TNB alloys, massive transformation of a into y-phase occurs on an experimentally and technologically easily accessible timescale for the first time. Consequently, novel type of micro structures, the massively transformed and a crossed-lamellae one, can be obtained, and may be utilized for commercial processing. The mechanical properties of massively transformed TiAl-based materials have only been briefly investigated. Therefore, it is proposed to carry out tensile test as well as creep experiments, and to determine fundamental properties of the massively transformed material as regard to its possible commercial application. Additional efforts are oriented towards optimisation of the strength and ductility properties of this particular microstructure by means of controlling of the grain size and precipitation behaviour, which will be realized by suitable heat-treatment procedures. Planned investigations should verify the usability of massive transformation for optimization of mechanical strength of the TNB alloys. The gained information would be of large scientific importance because of their contribution to the current status of knowledge about massive transformation in TNB materials, but also of a great practical meaning for possible future high-temperature applications of TiAl-based materials.

• DFG Programme: Research Grants
• Ehemaliger Antragsteller: Dr.-Ing. Slawomir Bystrzanowski, until 5/2006