DIRECTIONALLY SOLIDIFIED EUTECTIC TYPE ALLOYS WITH ALIGNED DELTA PHASE

摘要

A nickel alloy containing columbium and/or tantalum and chromium and/or aluminum and displaying eutectic-type behavior is unidirectionally cast under conditions resulting in coupled growth, providing a lamellar biphase or multiphase microstructure displaying about 25-40 percent of a substantially aligned delta phase, Ni3Cb, Ni3Ta or Ni3(Cb,Ta), in a nickel alloy matrix containing chromium and/or aluminum.