a gamma prime nickel - base superalloy and components formed therefrom that exhibit improved high - temperature dwell capabilities , including creep and hold time fatigue crack growth behavior . a particular example of a component is a powder metallurgy turbine disk of a gas turbine engine . the gamma - prime nickel - base superalloy contains , by weight , 16 . 0 to 30 . 0 % cobalt , 11 . 5 to 15 . 0 % chromium , 4 . 0 to 6 . 0 % tantalum , 2 . 0 to 4 . 0 % aluminum , 1 . 5 to 6 . 0 % titanium , up to 5 . 0 % tungsten , 1 . 0 to 7 . 0 % molybdenum , up to 3 . 5 % niobium , up to 1 . 0 % hafnium , 0 . 02 to 0 . 20 % carbon , 0 . 01 to 0 . 05 % boron , 0 . 02 to 0 . 10 % zirconium , the balance essentially nickel and impurities , wherein the titanium : aluminum weight ratio is 0 . 5 to 2 . 0 .