OXIDATION- AND CORROSION-RESISTANT HIGH-TEMPERATURE ALLOY OF HIGH TOUGHNESS AT ROOM TEMPERATURE FOR DIRECTIONAL SOLIDIFICATION, BASED ON AN INTERMETALLIC COMPOUND OF THE NICKEL ALUMINIDE TYPE

摘要

An. oxidation- and corrosion-resistant hightemperature alloy of high toughness at room temperature for directional solidification, based on an intermetallic compound of the nickel aluminide type and having the following composition: Al = 10 - 20 atom % Si = 0.5 - 8 atom % Nb = 2 - 10 atom % B = 0.1 - 2 atom % Ni = remainder, the total of Al, Si, Nb and B amounting at most to a value of 25 atom %. The alloy contains at least 90% by volume of the intermetallic phases Ni3Al, Ni3Si and Ni3Nb. (Figure)