Integrated Materials Development for Novel High Temperature Alloys – Helmholtz Research School Rearch Area “RA II Directional Solidification”
M.Sc. Camelia Gombola
Motivation
- increase of efficiency of Heat engines
- higher energy conversion efficiency through increase of operating temperatures
- development of materials with excellent high temperature strength in combination with high fracture toughness at low temperatures
- fibre-reinforced nickel aluminides NiAl-X(Cr, Mo) fulfill the requirements and make them potential candidates
- synthesis via directional solidification allows in-situ-formation of fibres (Cr and Mo) in a nickel aluminide matrix and further a reduction of transversal grain boundaries
Goals
Synthesis of directional solidified, fibre-reinforced nickel aluminides.
Techniques
- solidification experiments by levitation and zone melting
- characterization of the microstructure with regard to crystal orientation, phase formation und anisotropic properties
- influence of process parameters and alloy components on the synthesis of NiAl-Cr and NiAl-Mo alloys and microstructure
- determination of high temperature deformation properties via tensile creep testing