Effect of powder metallurgy method on strength and fracture toughness of NiAl

The effect of powder metallurgy methods on the temperature dependence of strength and fracture toughness of nickel aluminide is compared. Experiments were performed with specimens prepared by hydrostatic cold pressing followed by sintering, explosive wave compacting followed by heat treatment, and attrition milling followed by hot uniaxial pressing. No simple explanation was found for the strength behavior in terms of the toughening mechanisms.