a preferred superalloy may be formed from materials in the following weight percentages 15 5 to 16 5 cr 14 0 to 15 5 co 2 75 to 3 25 mo 2 25 to 2 75 al 4 75 to 5 25 ti 1 0 to 1 5 w 0 to 1 0 hf 0 to 0 5 fe 0 to 0 5 si 0 01 to 0 02 b 0 025 to 0 08 zr 0 03 to 0 10 c 0 to 0 2 at least one rare earth elements selected from the group of y la ce nb dy pr sm and gd less than 10 ppm s and the balance formed from ni a more preferred superalloy composition may be formed from materials in the following weight percentages 15 5 to 16 5 cr 14 25 to 14 75 co 2 80 to 3 20 mo 2 30 to 2 60 al 4 80 to 5 20 ti 1 2 to 1 5 w 0 10 to 0 15 hf 0 to 0 2 fe 0 10 to 0 15 si 0 01 to 0 02 b 0 025 to 0 050 zr 0 03 to 0.