Abstract
Rapidly solidified powder of Ni 3Al intermetallic compound modified with Fe, Ti and B was produced by a rotating electrode process (REP). The obtained powder has a mean particle size of 400 urn, spherical shape and very narrow size distribution. The powder was compacted by hot pressing to non-porous, homogeneous compacts with an average grain size of 50 μm. The yield strength shows positive temperature dependence with the maximum at 600°C. The ductility decreases moderately with temperature to the minimum at 600°C, and then abruptly increases. The results of this work show that the mechanical properties of the hot-pressed Ni 3Al-based powder produced by REP are better than or at least comparable to nickelaluminides obtained by advanced consolidation techniques (hot isostatic pressing, hot extrusion).
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