HIGH-STRENGHT Co-BASED ALLOY WITH ENHANCED WORKABILITY AND PROCESS FOR PRODUCING THE SAME

The high-strength Co-based alloy, comprising a composition which comprises, on the basis of mass ratio, 3 to 13% of Al and 0.01 to 60% of workability enhancing element, and further comprises one or more members selected from the following:

• 0.01 to 40% of Cr, 0.01 to 30% of Mo, 0.01 to 5% of Si, 0.01 to 30% of W, 0.01 to 10% of Zr, 0.01 to 15% of Ta, 0.01 to 10% of Hf, 0.01 to 20% of Ga, 0.01 to 20% of V, 0.01 to 12% of Ti, 0.01 to 20% of Nb, 0.001 to 3% of C, 0.01 to 20% of Rh, 0.01 to 20% of Pd, 0.01 to 20% of Ir, 0.01 to 20% of Pt, 0.01 to 10% of Au, 0.001 to 1% of B, and 0.001 to 1% of P in a total of 0.001 to 60%, and the balance being cobalt without incidental impurities;
• and the lamellar structure wherein the f.c.c. structure α-phase and β(B2)-type phase, a L12-type γ′ phase, a D019-type precipitate, and/or a M23C6-type carbide with an interlayer spacing of 100 μm or less are repeated in layers and the occupancy ratio of the lamellar structure to the whole metallic structure is 30% by volume or more.