Hafnium additions to the B-1900 base chemistry improve oxide scale adhesion and reduce grain boundary cracking during thermal cycling, extending component life in service. B-1900 + Hf retains the strong creep rupture performance of the base alloy while offering better resistance to oxidation spallation at temperatures approaching 980°C. It is used for both conventionally cast and directionally solidified turbine airfoils in aerospace and power generation.