Combustion synthesis of large bulk nanostructured Ni₆₅Al ₂₁Cr₁₄ Alloy

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.