|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials for High Temperature Applications: Next Generation Superalloys and Beyond
||Novel High Strength Eutectic Intermetallics
||Chandrasekhar Tiwary, Vilas Vishnu Gunjal, Abhishek Sharma, Kamanio Chattopadhyay, Dipankar Banerjee
|On-Site Speaker (Planned)
We describe a new class of superalloys based upon combinations of intermetallics as fine scale eutectic structures in the Ni-Al-Zr system. The effect of alloying additions on the structure and morphology of these eutectics is described. The microstructural stability of the as-cast material as function of long term thermal exposure is examined. Tensile and compressive properties as function of strain rate and temperature and microstructural length scales has been evaluated. The alloys show extremely high strength approaching 2 GPa upto temperatures of 700C with tensile ductility between 3-4 % at room temperature. Plastic deformation processes at room temperature have been examined in tensile tested samples and related to fracture processes in the alloys. Preliminary creep studies are reported. We have also examined the oxidation behaviour of these alloys under isothermal and thermal cycling at temperatures exceeding 900C.