High strength nickel base single crystal alloys

摘要

Disclosed are novel nickel base single crystal alloy compositions consisting essentially of, by weight, about 8.0-14.0% chromium, 1.5-6.0% cobalt, 0.5-2.0% molybdenum, 3.0-10% tungsten, 2.5-7. 0% titanium, 2.5-7. 0% aluminum, 3.0-6.0% tantalum, about 0.005% to about 1.0% each of hafnium and/or silicon, optional minor amounts of yttrium, lanthanum and/or manganese, and the balance nickel.PP Methods of thermal treatment and coating of the novel alloys to enhance their mechanical properties are also disclosed, as are articles produced by such methods.