Simultaneous synthesis and densification of NiAl and Ni3Al by pressure-assisted combustion.

Simultaneous synthesis and densification of NiAl and Ni₃Al from elemental powders of Ni and Al was investigated. Combustion synthesis was carried out under the uniaxial compressive pressure and preheating of die. It was shown that both the compressive pressure and preheating of die strongly affect the density, the grain size and the hardness of NiAl and Ni₃Al product. A high relative density of NiAl and Ni₃Al products as much as 99.8% was achieved under compressive pressure of 275 MPa and preheating temperature of 600°C. [ABSTRACT FROM AUTHOR]