Abstract
The toughness of brittle intermetallics has been improved by controlling the morphologies of the Ni 3 Al through the solution and aging treatment in (NiAl+Ni 3 Al) two-phase alloy. In this study, changes in the Ni 3 Al morphologies were attempted through variation of the heat treatment conditions. The microstructure was examined using optical and scanning electron microscopy and the phase was characterized by X-ray diffraction analysis. Our results indicated that the precipitation of the homogeneous and randomly-oriented Ni 3 Al during the final aging treatment could be made possible by performing an isothermal transformation of NiAl- (B2) to Ni 5 Al 3 single phase prior to the final aging treatment in Ni-34at.%Al alloy.
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