René 125 is a high-strength precipitation-hardened alloy combining hafnium additions for improved oxidation resistance with strong gamma prime strengthening for creep rupture performance at temperatures up to approximately 980°C. Its high hafnium and tantalum content support reliable oxidation resistance and grain boundary ductility for both equiaxed and DS casting. Qualified under C50TF60 and DMD 042932, it is used for turbine vanes and blades in aerospace and military gas turbine applications.