Abstract: A high-melting superalloy made of iridium or rhodium or both thereof as a base and containing at least nickel together with at least one a metal selected from the metal group consisting of titanium, zirconium, hafnium, vanadium, niobium, and tantalum, wherein at least both phases of an fcc phase and an LI2 phase are formed in the texture, and an amount of the LI2 phase from 20 to 80% by volume.

Abstract: The present inventions offer a nickel-based single crystal alloy which has a high strength, is easy in conducting the solution heat treatment, hardly gives a harmful phase and is resistant to corrosion at high temperature. A nickel-based single crystal alloy is offered where the composition consists of 7-15 of Co, 0.1-4 of Cr, 1-4 of Mo, 4-7 of W, 5.5-6.5 of Al, 5-7 of Ta, 4-5.5 of Re, 0-0.5 each of Hf and V, and 0-2 each of Ti and Nb in terms of % by weight and residual part substantially consists of Ni wherein said alloy may contain unavoidable impurities.

Abstract: A nickel-base single-crystal superalloy, essentially consists of, in percentages by weight, 4.0% to 11.0% of cobalt, 3.5% to less than 5.0% of chromium, 0.5% to 3.0% of molybdenum, 7.0% to 10.0% of tungsten, 4.5% to 6.0% of aluminum, 0.1% to 2.0% of titanium, 5.0% to 8.0% of tantalum, 1.0% to 3.0% of rhenium, 0.01% to 0.5% of hafnium, 0.01% to 0.1% of silicon, and a balance being nickel and inevitable impurity, a total amount of rhenium and chromium being not less than 4.0% and a total amount of rhenium, molybdenum, tungsten and chromium being not more than 18.0%.

Abstract: A high-melting superalloy made of iridium or rhodium or both thereof as a base and containing at least nickel together with at least one a metal selected from the metal group consisting of titanium, zirconium, hafnium, vanadium, niobium, and tantalum, wherein at least both phases of an fcc phase and an LI2 phase are formed in the texture, and an amount of the LI2 phase from 20 to 80% by volume.

Abstract: An iridium-containing nickel-base superalloy which has an orderly arrayed allow structure to be strengthened by precipitation and contains iridium dissolved in the &ggr; and &ggr;′ phases to be strengthened by solid solution, thus being improved in high-temperature strength and resistance to high-temperature corrosion.

Abstract: The present inventions offer a nickel-based single crystal alloy which has a high strength, is easy in conducting the solution heat treatment, hardly gives a harmful phase and is resistant to corrosion at high temperature.

Abstract: A nickel-base single-crystal superalloy, essentially consists of, in percentages by weight, 4.0% to 11.0% of cobalt, 3.5% to less than 5.0% of chromium, 0.5% to 3.0% of molybdenum, 7.0% to 10.0% of tungsten, 4.5% to 6.0% of aluminum, 0.1% to 2.0% of titanium, 5.0% to 8.0% of tantalum, 1.0% to 3.0% of rhenium, 0.01% to 0.5% of hafnium, 0.01% to 0.1% of silicon, and a balance being nickel and inevitable impurity, a total amount of rhenium and chromium being not less than 4.0% and a total amount of rhenium, molybdenum, tungsten and chromium being not more than 18.0%.

Abstract: The present inventions offer a nickel-based single crystal alloy which has a high strength, is easy in conducting the solution heat treatment, hardly gives a harmful phase and is resistant to corrosion at high temperature.

Abstract: The invention relates to a nickel-base single-crystal superalloy applied to parts for industrial gas turbine or the like such as turbine rotor blade and stator blade which are used at high temperatures, a method for manufacturing the same, and gas turbine parts prepared from such nickel-base single-crystal superalloys, and more particularly the invention provides a nickel-base single-crystal superalloy consisting essentially of, in percentages by weight, 5% to 10% cobalt, 4.7% to 6% chromium, more than 2.0% to less than 3.5% molybdenum, 7.5% to 10% tungsten, 5% to 6% aluminum, 0.1% to 2% titanium, 4% to 5.5% tantalum, 1% to 4% rhenium, 0.01% to 0.2% hafnium, the balance being nickel and incidental impurities, which is excellent in high-temperature strength and high-temperature corrosion resistance, and further excellent in structural stability even in a long time use.

Abstract: Refractory superalloys consist essentially of a primary constituent selected from the group consisting of iridium, rhodium, and a mixture thereof, and one or more additive elements selected from the group consisting of niobium, tantalum, hafnium, zirconium, uranium, vanadium, titanium and aluminum, and the superalloys having a microstructure containing an FCC-type crystalline structure phase and an L1.sub.2 -type crystalline structure phase are precipitated. Preferably the amount of additive element(s) is 2 to 22 atom %.

Abstract: A gamma-prime precipitation hardening nickel-base yttria particle-dispersion-strengthened superalloy having a composition consisting essentially, by weight %, of 3.5 to 6.0 % of Al, 7.0 to 10.0 % of Co, 8.0 to 10.5 % of Cr, 0.5 to 1.5 % of Ti, 4.0 to 6.5 % of Ta, 7.0 to 9.0 % of W, 1.5 to 2.5 % of Mo, 0.02 to 0.2 % of Zr, 0.001 to 0.1 % of C, 0.001 to 0.02 % of B, 0.5 to 1.7 % of Y.sub.2 O.sub.3 and the balance being Ni. It has an excellent high-temperature creep rupture strength and a good corrosion resistance at high temperatures.

Abstract: A gamma-prime precipitation hardening nickel-base yttria particle-dispersion-strengthened superalloy having a composition consisting essentially of, by weight, 3.0 to 6.0% of Al, 8.5 to 10.9% of Co, 3.9 to 7.5% of Cr, 0.5 to 1.2% of Ti, 3.6 to 6.3% of Ta, 11.4 to 13.3% of W, 0.02 to 0.2% of Zr, 1.3 to 2.6% of Mo, 0.001 to 0.1% of C, 0.001 to 0.02% of B, 0.5 to 1.7% of yttria (Y.sub.2 O.sub.3), not more than 0.8% of O and the balance being Ni and having a structure composed of coarse recrystallized grains with a GAR of at least 20 and a short axis diameter of at least 0.