, Volume 21, Issue 9, pp 3297-3301

The structure of consolidated rapidly solidified powders of Ni3Al

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Abstract

Rapidly solidified powders of stoichiometric Ni3Al and Ni3Al containing boron and titanium have each been consolidated by two distinct routes, namely hot extrusion or hot compaction. The resulting microstructures have been examined by optical microscopy, scanning electron microscopy and transmission electron microscopy. The consolidated material did not retain the non-equilibrium structure of the rapidly solidified powders. The addition of titanium and boron produced material with a larger final grain size, a decreased incidence of twinning and, in the extruded material, led to cracking. Although all processing was performed in inert atmospheres, oxides were present in all consolidated products.