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 high-temperature 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:PPAl=10-20 atom % PP Si=0.5-8 atom %PP Nb=2-10 atom %P PB=0.1-2 atom %PPNi=remainder,PP 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 Ni. sub.3 Al, Ni.sub.3 Si and Ni.sub.3 Nb.