Patent ID: 8771440

Claim:
A Ni-based single crystal superalloy which has a composition including: 5.0 to 7.0 wt % of Al, 4.0 to 10.0 wt % of Ta, 1.1 to 4.5 wt % of Mo, 4.0 to 10.0 wt % of W, 3.1 to 8.0 wt % of Re, 0.0 to 2.0 wt % of Hf, 5.1 wt % to 8.5 wt % of Cr, 0.0 to 9.9 wt % of Co, 0.0 to 4.0 wt % of Nb, and 1.0 to 14.0 wt % of Ru in terms of weight ratio; and the remainder including Ni and incidental impurities, and wherein when a formula, that is, an oxidation parameter (OP)=5.5×[Cr (wt %)]+15.0×[Al (wt %)]+9.5×[Hf (wt %)] is set, the equation OP≧108 is satisfied, and wherein when a lattice constant of a matrix is denoted by al and a lattice constant of a precipitated phase is denoted by a2, the equation a2<0.999a1 is satisfied.