Patent ID: 8551265

Claim:
A cobalt-base alloy with high heat resistance and high strength comprising: in a cobalt-base alloy comprising a composition of, in terms of mass proportion, 0.1 to 10% of Al, 3.0 to 45% of W, and Co as a remainder containing indispensable impurities, a metal texture in which a Ll 2 -type intermetallic compound (γ′ phase) of Co 3 (Al, W) by atom ratio is precipitated, the Ll 2 -type intermetallic compound is precipitated under conditions where the particle diameter is 10 nm to 1 μm and the precipitation amount is 40 to 85% by volume, and the mismatch of the lattice constant between the γ′ phase and matrix (y phase) is 0.5% or less.