Combustion synthesis of large bulk nanostructured Ni65Al 21Cr14 Alloy

Abstract

A large bulk nanostructured Ni65Al21Cr14 alloy with dimensions of φ 100mm × 6mm was produced by combustion synthesis technique followed with rapid solidification. The Ni 65Al21Cr14 alloy was composed of γ-Ni3Al/γ-Ni(Al, Cr) eutectic matrix and -Ni(Al, Cr) dendrite. The eutectic matrix consisted of 80-150nm cuboidal ()-Ni3Al and 2-5nm -Ni(Al, Cr) boundary. The dentrite was comprised of high-density growth twins with about 3-20nm in width. The nanostructured Ni65Al 21Cr14 alloy exhibited simultaneously high fracture strength of 2200MPa and good ductility of 26% in compression test. © 2011 Jiqiang Ma et al.