Forschungsbericht 2009
Characterization and optimization of mechanical properties of massively transformed Ti-46Al-9Nb sheet material
Mechanical properties of TiAl-based alloys are mainly determined by chemical composition and their microstructure as a result of thermomechanical processing. In the recently developed novel class of these materials with high Nb content, called TiAl alloys of 3rd generation or TNB alloys, massive transformation of a into g-phase occurs on an experimentally and technologically easily accessible timescale for the first time. Consequently, novel type of microstructures, 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. Publikationen
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