Ni-rich alloys based on approximate ternary composition Ni-8Mo-15A1
(at%) are presently under investigation in an attempt to study the
contribution, if any, of the profusion of Mo-rich NixMo
metastable compounds that these alloys contain to their excellent mechanical
properties. One of the alloys containing metastable
NixMo precipitates is RSR 197 of composition
Ni-8.96Mo-15.06A1-1.98Ta-.015Yt. The alloy was prepared at Pratt and Whitney
Government Products Division, West Palm Beach, Florida, from rapidly
solidified powder. The powder was canned under inert conditions and extruded
as rod at 1315°C. The as-extruded rod, after air cooling, was solution
treated at 1315°C for two hours, air cooled, and heat treated for one hour
at 815°C, followed again by air cooling.