NI3(SI, TI) INTERMETALLIC COMPOUND TO WHICH TANTALUM IS ADDED

The present invention provides a structural material having excellent hardness (strength) characteristics. The present invention provides an Ni 3 (Si, Ti)-based intermetallic compound characterized by containing from 25 to 500ppm by weight of B with respect to a weight of an intermetallic compound having a composition of 100% by atom in total consisting of from 10.0 to 12.0% by atom of Si, 1.5% by atom or more but less than 7.5% by atom of Ti, more than 2.0% by atom but 8.0% by atom or less of Ta and a balance made up of Ni excepting impurities, and by having a microstructure composed of an L1 2 phase or a microstructure composed of an L1 2 phase and a second phase dispersion containing Ni and Ta.