| Abstract Scope |
The microstructure template of a disordered matrix reinforced by ordered-intermetallic precipitates offer a potent design strategy for high temperature materials, enabling strength alongside damage tolerance, which has been central to the success of fcc Ni-superalloys. Such a strategy is equally applicable to bcc-based systems, which offer advantages of increased melting point and lower cost. However, whilst bcc-superalloys of refractory metals (RM), titanium or iron strengthened by ordered-bcc precipitates such as B2 or L21 are possible, they are yet to be a commercial reality.
In this talk, opportunities for bcc-superalloys systems will be discussed, from binaries to Fe-NiAl, Cr-Ni2AlTi, Mo-NiAl, Ta-(Ti,Zr)2Al(Mo,Nb) and Nb-Pd2HfAl as well as Refractory High Entropy Superalloys. It will then discuss our latest developments in tungsten-based bcc-superalloys, beta-Ti superalloys and ferritic superalloys and give perspectives for the onward development of the bcc-superalloy concept for application in nuclear fusion, Gen-IV fission, gas turbines and concentrated solar power. |