Ni-BASED SINGLE CRYSTAL SUPERALLOY

A Ni-based single crystal superalloy which has a composition including:

• 5.0 to 6.5 wt % of Al, 4.0 to 6.5 wt % of Ta, 2.1 to 4.0 wt % of Mo, 4.0 to 6.0 wt % of W, 4.5 to 7.5 wt % of Re, 0.1 to 2.0 wt % of Hf, 2.5 to 8.5 wt % of Cr, 4.5 to 9.5 wt % of Co, 0.0 to 1.5 wt % of Nb, and 1.5 to 6.5 wt % of Ru in terms of weight ratio;
• and
• the remainder including Ni and incidental impurities.

A Ni-based single crystal superalloy which has a composition including:

• 5.5 to 5.9 wt % of Al, 4.7 to 5.6 wt % of Ta, 2.2 to 2.8 wt % of Mo, 4.4 to 5.6 wt % of W, 5.0 to 6.8 wt % of Re, 0.1 to 2.0 wt % of Hf, 4.0 to 6.7 wt % of Cr, 5.3 to 9.0 wt % of Co, 0.0 to 1.0 wt % of Nb, and 2.3 to 5.9 wt % of Ru in terms of weight ratio;
• and
• the remainder including Ni and incidental impurities.