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Elastic constants for a polycrystalline stoichiometric NiAl intermetallic obtained via different processing routes were measured using ultrasonic methods. Samples having various porosity, (0 – 0.1), texture, and 0.2 – 200 μm grain size were produced by combined operations of casting or self-sustaining high-temperature synthesis, followed by hot hydrostatic extrusion and/or hot isostatic pressing. It was shown that the bulk modulus, as a quantity independent of crystallographic texture, depends on porosity according to an exponential relationship. Elastic properties of near theoretical density materials having various grain sizes were measured under high hydrostatic pressure ranging up to 1 GPa. Parameters of the equation of state were determined. The values of bulk moduli and their first pressure derivatives for the nanostructured material under investigation and of single crystals appeared to be the same.

The effect of the microstructure on elastic properties of a polycrystalline stoichiometric NiAl