Abstract
Disclosed is a Ni-based single crystal superalloy having a composition consisting of, in mass percent, 5.0-7.0% of Al, 4.0-8.0% of Ta, 0-2.0% of Mo, 3.0-8.0% of W, 3.0-8.0% of Re, 0-0.50% of Hf, 3.0-7.0% of Cr, 0-9.9% of Co, 1.0-10.0% of Ru and the balance of Ni and unavoidable impurities. The Ni-based single crystal superalloy is suppressed in TCP phase precipitation at high temperatures, thereby being improved in strength at high temperatures, while having oxidation resistance at high temperatures at the same time.