It is called MA 956.
   Since the rotary exhaust temperatures are up around
   1800 F it will be needed. One can always cool the exuast
   before it goes to the turbine but that implies a loss
   of recovered energy.


   Paul Lamar

Hi Paul & Steve
Looks like engine rotors from this alloy would have to be CNC machined from solid billet or forgings.
It is NOT a castable material (unless you are willing to lose the special high-temp qualities) :

From Special Metals - "INCOLOY® alloy MA956 (UNS S67956), first developed as an aerospace superalloy and now used in a range of industrial applications, combines excellent strength and fabricability with outstanding resistance to prolonged exposure up to 1300°C (2400°F). Its exceptional properties result from the mechanical alloying process by which it is made; a process which allows a fine distribution of yttrium oxide particles to be incorporated into a highly corrosion-resistant Fe-Cr-Al alloy"

From Matweb - "An iron-chromium-aluminum alloy that is oxide dispersion strengthened and produced by mechanical alloying"

From wiki - "Incoloy MA956 is made by a mechanical alloying <https://en.wikipedia.org/wiki/Mechanical_alloying> rather than a bulk-melting process"

Cheers
Paul Randal


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