Nickel-based single crystal superalloy

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Single-crystal nickel-based superalloys comprising by weight, 3.0 to 7.0 % Cr, 9.5 to 15.0 % Co, 4.5 to 8.0 % W, 3.3 to 6.0 % Re, 4.0 to 8.0 % Ta, 0.8 to 2.0 % Ti, 4.5 to 6.5 % Al, 0.01 to 0.2 % Hf, less than 0.5 % Mo, 0.01 % or less C, 0.005 % or less B, 0.01 % or less Zr, 0.005 % or less O, 0.005 % or less N, optionally 1-500ppm rare earth and balance substantially Ni.